ic 555 timer small diagram needed

Discussion in 'Electronic Basics' started by porkysh1t@yahoo.co.uk, Sep 30, 2008.

  1. Guest

    right what i need is a diagram for the conditions i need... let me
    explain

    i need to press and release a NO switch and after certain time like
    say 15 mins i need it to engage a relay for say 5 mins then disengage
    the relay and wait for the push button again after.
    **i could go as far as opto-isolation as it doesnt need much current
    for switching but it does need seperation

    many thanks
    Ian

    ps i seen many diagrams with this tan and other but there talking
    beyond what need to know.. i got a strong guess i need 2x555 and
    perhaps what they call a "flip flop" circuit unless anyone has a
    better idea?
     
    , Sep 30, 2008
    #1
    1. Advertising

  2. bw Guest

    <> wrote in message
    news:...
    > right what i need is a diagram for the conditions i need... let me
    > explain
    >
    > i need to press and release a NO switch and after certain time like
    > say 15 mins i need it to engage a relay for say 5 mins then disengage
    > the relay and wait for the push button again after.
    > **i could go as far as opto-isolation as it doesnt need much current
    > for switching but it does need seperation
    >
    > many thanks
    > Ian
    >
    > ps i seen many diagrams with this tan and other but there talking
    > beyond what need to know.. i got a strong guess i need 2x555 and
    > perhaps what they call a "flip flop" circuit unless anyone has a
    > better idea?


    A CMOS 556 would work, but since you don't need to know how it works, just
    purchase a timer at the store.
    Another idea is to scavenge a microwave oven control board, save the keypad.
    I've done it and it will do what you want.
     
    bw, Sep 30, 2008
    #2
    1. Advertising

  3. ehsjr Guest

    wrote:
    > right what i need is a diagram for the conditions i need... let me
    > explain
    >
    > i need to press and release a NO switch and after certain time like
    > say 15 mins i need it to engage a relay for say 5 mins then disengage
    > the relay and wait for the push button again after.
    > **i could go as far as opto-isolation as it doesnt need much current
    > for switching but it does need seperation
    >
    > many thanks
    > Ian
    >
    > ps i seen many diagrams with this tan and other but there talking
    > beyond what need to know.. i got a strong guess i need 2x555 and
    > perhaps what they call a "flip flop" circuit unless anyone has a
    > better idea?


    Getting 15 minutes from a 555 reliably is tough. Instead,
    set the 555 to run astable at ~2.5 minutes, and use its
    output as the clock for a 4017.

    Diode or all of the 4017 outputs except count 9 to the base
    of an NPN and a 1K. An example of the "diode or" is best seen
    in the second partial schematic below. The schematics are
    representative of what you need to do, not complete. The N/O
    switch also connects to the commoned cathodes of the diodes.
    The NPN controls power to the circuit. Pressing the button
    turns the NPN on, and the 4017 keeps it turned on until the
    count reaches 9, in ~ 20 minutes. Diode or counts 7 and 8
    to another NPN through a 1K - that transistor can control a
    relay to give you you a ~ 5 minute output.

    NPN
    +12 ---+---+ +------- Vcc to 555 and 4017 and relay
    | c\ /e
    | ---
    | |
    | [1K]
    | | Dx
    +-o o-+------|<---Counts 0-8 from 4017,
    N/O | each count thru its own
    | diode (Dx)
    [33K]
    |
    Gnd ---------+

    The 33K ensures the transistor turns off when the 4017
    is not counting from 0 through 8.

    For your 5 minute output:

    +Vcc ----+
    |
    [Relay]
    | +---|<---Count 8 from 4017
    \c |
    NPN |---[1K]---+---|<---Count 7 from 4017
    /e |
    | |
    Gnd -----+----[33K]---+

    The relay needs a diode across it with the cathode
    connected on the + side.

    Ed
     
    ehsjr, Oct 1, 2008
    #3
  4. Guest

    On Sep 30, 4:48 am, "bw" <> wrote:
    > <> wrote in message
    >
    > news:...
    >
    >
    >
    > > right what i need is a diagram for the conditions i need... let me
    > > explain

    >
    > > i need to press and release a NO switch and after certain time like
    > > say 15 mins i need it to engage a relay for say 5 mins then disengage
    > > the relay and wait for the push button again after.
    > > **i could go as far as opto-isolation as it doesnt need much current
    > > for switching but it does need seperation

    >
    > > many thanks
    > > Ian

    >
    > > ps i seen many diagrams with this tan and other but there talking
    > > beyond what need to know.. i got a strong guess i need 2x555 and
    > > perhaps what they call a "flip flop" circuit unless anyone has a
    > > better idea?

    >
    > A CMOS 556 would work, but since you don't need to know how it works, just
    > purchase a timer at the store.
    > Another idea is to scavenge a microwave oven control board, save the keypad.
    > I've done it and it will do what you want.


    i dont have any decent gadget shops that do what i need..

    i need from a push button 15mins off then 5 min on then off waiting
    for push button again to start again at 115 off etc etc, the microwave
    controll would allow it to be on for 15 mins and off permenant,, not
    what i need
     
    , Oct 1, 2008
    #4
  5. Bo Vance Guest

    wrote:
    > right what i need is a diagram for the conditions i need... let me
    > explain
    >
    > i need to press and release a NO switch and after certain time like
    > say 15 mins i need it to engage a relay for say 5 mins then disengage
    > the relay and wait for the push button again after.
    > **i could go as far as opto-isolation as it doesnt need much current
    > for switching but it does need seperation
    >
    > many thanks
    > Ian
    >
    > ps i seen many diagrams with this tan and other but there talking
    > beyond what need to know.. i got a strong guess i need 2x555 and
    > perhaps what they call a "flip flop" circuit unless anyone has a
    > better idea?


    Maybe this would help.
    <http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm#555delay.gif>
     
    Bo Vance, Oct 1, 2008
    #5
  6. neon VIP Member

    Joined:
    Oct 21, 2006
    Messages:
    1,325
    that is easy done use pin 2 to trigger the first timer then use the ouput to trigger the next and so forth. use the lm555 as monostable once triggered it will time out for the time you set you can reset it at any time using pin 4. and to get long times like hours use a current source as apposed to plain resistors.
     
    neon, Oct 1, 2008
    #6
  7. Guest

    On Oct 1, 1:02 am, ehsjr <> wrote:
    > wrote:
    > > right what i need is a diagram for the conditions i need... let me
    > > explain

    >
    > > i need to press and release a NO switch and after certain time like
    > > say 15 mins i need it to engage a relay for say 5 mins then disengage
    > > the relay and wait for the push button again after.
    > > **i could go as far as opto-isolation as it doesnt need much current
    > > for switching but it does need seperation

    >
    > > many thanks
    > > Ian

    >
    > > ps i seen many diagrams with this tan and other but there talking
    > > beyond what need to know.. i got a strong guess i need 2x555 and
    > > perhaps what they call a "flip flop" circuit unless anyone has a
    > > better idea?

    >
    > Getting 15 minutes from a 555 reliably is tough. Instead,
    > set the 555 to run astable at ~2.5 minutes, and use its
    > output as the clock for a 4017.
    >
    > Diode or all of the 4017 outputs except count 9 to the base
    > of an NPN and a 1K. An example of the "diode or" is best seen
    > in the second partial schematic below. The schematics are
    > representative of what you need to do, not complete. The N/O
    > switch also connects to the commoned cathodes of the diodes.
    > The NPN controls power to the circuit. Pressing the button
    > turns the NPN on, and the 4017 keeps it turned on until the
    > count reaches 9, in ~ 20 minutes. Diode or counts 7 and 8
    > to another NPN through a 1K - that transistor can control a
    > relay to give you you a ~ 5 minute output.
    >
    > NPN
    > +12 ---+---+ +------- Vcc to 555 and 4017 and relay
    > | c\ /e
    > | ---
    > | |
    > | [1K]
    > | | Dx
    > +-o o-+------|<---Counts 0-8 from 4017,
    > N/O | each count thru its own
    > | diode (Dx)
    > [33K]
    > |
    > Gnd ---------+
    >
    > The 33K ensures the transistor turns off when the 4017
    > is not counting from 0 through 8.
    >
    > For your 5 minute output:
    >
    > +Vcc ----+
    > |
    > [Relay]
    > | +---|<---Count 8 from 4017
    > \c |
    > NPN |---[1K]---+---|<---Count 7 from 4017
    > /e |
    > | |
    > Gnd -----+----[33K]---+
    >
    > The relay needs a diode across it with the cathode
    > connected on the + side.
    >
    > Ed


    Right, so basically I connect to the npn transistor by diodes (or
    leds?) with pins 1, 2, 3, 4, 7 and 10 and use pins 5and 6 connected to
    the npn and opto-isolation device instead for switching another npn
    for a relay. It’s the same as a diode but using less power than the
    relay, so I figured that out its now the 555 timer connection and
    circuit to the cmos chip.

    The tech sheet I was looking at started from output 0, this means
    pins 9 and 11 don’t use (just incase someone else finds this useful)

    right the 555 pinout?
    1,is gnd
    2, E from npn
    3, connect to hi-low on cmos
    4,dont use
    5,dont use
    6, connect to ground?
    7, connect c+r to 1
    8, V+

    please can you confirm I have this correct

    Questions.
    What do the diodes and the switch connect to on the npn, I really need
    a better drawing.
    I did see on the tech sheet of the cmos chip it sounds like that the
    output pins give out different power or something as it suggests that
    only certain pins to be used to time another decade counter cmos chip,
    is this right if so do I still use diode to the npn?
     
    , Oct 2, 2008
    #7
  8. ehsjr Guest

    wrote:
    > On Oct 1, 1:02 am, ehsjr <> wrote:
    >
    >> wrote:
    >>
    >>>right what i need is a diagram for the conditions i need... let me
    >>>explain

    >>
    >>>i need to press and release a NO switch and after certain time like
    >>>say 15 mins i need it to engage a relay for say 5 mins then disengage
    >>>the relay and wait for the push button again after.
    >>>**i could go as far as opto-isolation as it doesnt need much current
    >>>for switching but it does need seperation

    >>
    >>>many thanks
    >>>Ian

    >>
    >>>ps i seen many diagrams with this tan and other but there talking
    >>>beyond what need to know.. i got a strong guess i need 2x555 and
    >>>perhaps what they call a "flip flop" circuit unless anyone has a
    >>>better idea?

    >>
    >>Getting 15 minutes from a 555 reliably is tough. Instead,
    >>set the 555 to run astable at ~2.5 minutes, and use its
    >>output as the clock for a 4017.
    >>
    >>Diode or all of the 4017 outputs except count 9 to the base
    >>of an NPN and a 1K. An example of the "diode or" is best seen
    >>in the second partial schematic below. The schematics are
    >>representative of what you need to do, not complete. The N/O
    >>switch also connects to the commoned cathodes of the diodes.
    >>The NPN controls power to the circuit. Pressing the button
    >>turns the NPN on, and the 4017 keeps it turned on until the
    >>count reaches 9, in ~ 20 minutes. Diode or counts 7 and 8
    >>to another NPN through a 1K - that transistor can control a
    >>relay to give you you a ~ 5 minute output.
    >>
    >> NPN
    >> +12 ---+---+ +------- Vcc to 555 and 4017 and relay
    >> | c\ /e
    >> | ---
    >> | |
    >> | [1K]
    >> | | Dx
    >> +-o o-+------|<---Counts 0-8 from 4017,
    >> N/O | each count thru its own
    >> | diode (Dx)
    >> [33K]
    >> |
    >> Gnd ---------+
    >>
    >>The 33K ensures the transistor turns off when the 4017
    >>is not counting from 0 through 8.
    >>
    >>For your 5 minute output:
    >>
    >> +Vcc ----+
    >> |
    >> [Relay]
    >> | +---|<---Count 8 from 4017
    >> \c |
    >> NPN |---[1K]---+---|<---Count 7 from 4017
    >> /e |
    >> | |
    >> Gnd -----+----[33K]---+
    >>
    >>The relay needs a diode across it with the cathode
    >>connected on the + side.
    >>
    >>Ed

    >
    >
    > Right, so basically I connect to the npn transistor by diodes (or
    > leds?) with pins 1, 2, 3, 4, 7 and 10


    Yes those are the correct pins, but you need to add
    more pins - pin 9 and pin 10. That will give you
    counts 0,1,2,3,4,5,6,7, and 8. Each count stays
    active for 2.5 seconds, so the timing cycle is
    2.5 * 8 = 20 seconds. Each output (count) goes +
    for 2.5 seconds. The output is connected through
    a diode, and the cathodes of t6he diodes are connected
    together. The base of the NPN is connected to the cathodes
    through a 1K resistor.

    The collector of that NPN is connected to the plus
    side of whatever power supply you are using. The power
    supply needs to be between 5 and 15 volts. The emitter
    of that NPN provides power for the 4017, the 555 and the
    relay.

    > and use pins 5and 6 connected to


    No, use pins 6 and 9. They are connected to 2 more diodes.
    Those two diodes als have their cathodes connected to a 1K
    resistor, and the other side of that 1K resistor is connected
    to the base of another NPN transistor. No opto isolator is
    needed or used.

    > the npn and opto-isolation device instead for switching another npn
    > for a relay. It’s the same as a diode but using less power than the
    > relay, so I figured that out its now the 555 timer connection and
    > circuit to the cmos chip.
    >
    > The tech sheet I was looking at started from output 0, this means
    > pins 9 and 11 don’t use (just incase someone else finds this useful)


    You will use pin 9, but you won't use pin 11

    >
    > right the 555 pinout?
    > 1,is gnd
    > 2, E from npn
    > 3, connect to hi-low on cmos
    > 4,dont use
    > 5,dont use
    > 6, connect to ground?
    > 7, connect c+r to 1
    > 8, V+
    >
    > please can you confirm I have this correct


    No - see below.

    >
    > Questions.
    > What do the diodes and the switch connect to on the npn,


    The base of the NPN, through a 1K resistor.

    > I really need
    > a better drawing.
    > I did see on the tech sheet of the cmos chip it sounds like that the
    > output pins give out different power or something as it suggests that
    > only certain pins to be used to time another decade counter cmos chip,
    > is this right if so do I still use diode to the npn?
    >


    For a diagram of the 555, see this url:
    http://www.doctronics.co.uk/555.htm#astable

    You will select R1, R2 and C to set the timing for
    ~ 2.5 seconds. Start with R1 = 33K and use a 50K
    pot for R2. For C, use a 33 uF electrolytic.
    You can adjust the pot to "fine tune" the 2.5
    second pulses that the 555 will produce.

    You can also find a diagram of the 4017 at
    http://www.doctronics.co.uk/4017.htm

    Connect the output (pin 3) of the 555 to the clock input
    of the 4017 through a 1K resistor.

    If this is not clear, I can email a jpg schematic
    to you.

    Ed
     
    ehsjr, Oct 2, 2008
    #8
  9. ehsjr Guest

    ehsjr wrote:
    > wrote:
    >
    >> On Oct 1, 1:02 am, ehsjr <> wrote:
    >>
    >>> wrote:
    >>>
    >>>> right what i need is a diagram for the conditions i need... let me
    >>>> explain
    >>>
    >>>
    >>>> i need to press and release a NO switch and after certain time like
    >>>> say 15 mins i need it to engage a relay for say 5 mins then disengage
    >>>> the relay and wait for the push button again after.
    >>>> **i could go as far as opto-isolation as it doesnt need much current
    >>>> for switching but it does need seperation
    >>>
    >>>
    >>>> many thanks
    >>>> Ian
    >>>
    >>>
    >>>> ps i seen many diagrams with this tan and other but there talking
    >>>> beyond what need to know.. i got a strong guess i need 2x555 and
    >>>> perhaps what they call a "flip flop" circuit unless anyone has a
    >>>> better idea?
    >>>
    >>>
    >>> Getting 15 minutes from a 555 reliably is tough. Instead,
    >>> set the 555 to run astable at ~2.5 minutes, and use its
    >>> output as the clock for a 4017.
    >>>
    >>> Diode or all of the 4017 outputs except count 9 to the base
    >>> of an NPN and a 1K. An example of the "diode or" is best seen
    >>> in the second partial schematic below. The schematics are
    >>> representative of what you need to do, not complete. The N/O
    >>> switch also connects to the commoned cathodes of the diodes.
    >>> The NPN controls power to the circuit. Pressing the button
    >>> turns the NPN on, and the 4017 keeps it turned on until the
    >>> count reaches 9, in ~ 20 minutes. Diode or counts 7 and 8
    >>> to another NPN through a 1K - that transistor can control a
    >>> relay to give you you a ~ 5 minute output.
    >>>
    >>> NPN
    >>> +12 ---+---+ +------- Vcc to 555 and 4017 and relay
    >>> | c\ /e
    >>> | ---
    >>> | |
    >>> | [1K]
    >>> | | Dx
    >>> +-o o-+------|<---Counts 0-8 from 4017,
    >>> N/O | each count thru its own
    >>> | diode (Dx)
    >>> [33K]
    >>> |
    >>> Gnd ---------+
    >>>
    >>> The 33K ensures the transistor turns off when the 4017
    >>> is not counting from 0 through 8.
    >>>
    >>> For your 5 minute output:
    >>>
    >>> +Vcc ----+
    >>> |
    >>> [Relay]
    >>> | +---|<---Count 8 from 4017
    >>> \c |
    >>> NPN |---[1K]---+---|<---Count 7 from 4017
    >>> /e |
    >>> | |
    >>> Gnd -----+----[33K]---+
    >>>
    >>> The relay needs a diode across it with the cathode
    >>> connected on the + side.
    >>>
    >>> Ed

    >>
    >>
    >>
    >> Right, so basically I connect to the npn transistor by diodes (or
    >> leds?) with pins 1, 2, 3, 4, 7 and 10

    >
    >
    > Yes those are the correct pins, but you need to add
    > more pins - pin 9 and pin 10. That will give you
    > counts 0,1,2,3,4,5,6,7, and 8. Each count stays
    > active for 2.5 seconds, so the timing cycle is
    > 2.5 * 8 = 20 seconds. Each output (count) goes +
    > for 2.5 seconds. The output is connected through
    > a diode, and the cathodes of t6he diodes are connected
    > together. The base of the NPN is connected to the cathodes
    > through a 1K resistor.


    Groan - you wanted 2.5 minutes, not seconds. Change the
    word seconds to minutes above. Correction to the 555
    components appears below. Also, I added 1 pin too
    many. You want counts 0,1,2,3,4,5,6 and 7, so you need
    to add pin 10 (not pins 9 and 10 - do not add pin 9).

    >
    > The collector of that NPN is connected to the plus
    > side of whatever power supply you are using. The power
    > supply needs to be between 5 and 15 volts. The emitter
    > of that NPN provides power for the 4017, the 555 and the
    > relay.
    >
    >> and use pins 5and 6 connected to

    >
    >
    > No, use pins 6 and 9.

    ^^^ ^^ ^^
    Yes, use pins 5 and 6

    > They are connected to 2 more diodes.
    > Those two diodes als have their cathodes connected to a 1K
    > resistor, and the other side of that 1K resistor is connected
    > to the base of another NPN transistor. No opto isolator is
    > needed or used.
    >
    >> the npn and opto-isolation device instead for switching another npn
    >> for a relay. It’s the same as a diode but using less power than the
    >> relay, so I figured that out its now the 555 timer connection and
    >> circuit to the cmos chip.
    >>
    >> The tech sheet I was looking at started from output 0, this means
    >> pins 9 and 11 don’t use (just incase someone else finds this useful)

    >
    >
    > You will use pin 9, but you won't use pin 11
    >
    >>
    >> right the 555 pinout?
    >> 1,is gnd
    >> 2, E from npn
    >> 3, connect to hi-low on cmos
    >> 4,dont use
    >> 5,dont use
    >> 6, connect to ground?
    >> 7, connect c+r to 1
    >> 8, V+
    >>
    >> please can you confirm I have this correct

    >
    >
    > No - see below.
    >
    >>
    >> Questions.
    >> What do the diodes and the switch connect to on the npn,

    >
    >
    > The base of the NPN, through a 1K resistor.
    >
    >> I really need
    >> a better drawing.
    >> I did see on the tech sheet of the cmos chip it sounds like that the
    >> output pins give out different power or something as it suggests that
    >> only certain pins to be used to time another decade counter cmos chip,
    >> is this right if so do I still use diode to the npn?
    >>

    >
    > For a diagram of the 555, see this url:
    > http://www.doctronics.co.uk/555.htm#astable
    >
    > You will select R1, R2 and C to set the timing for
    > ~ 2.5 seconds. Start with R1 = 33K and use a 50K
    > pot for R2. For C, use a 33 uF electrolytic.
    > You can adjust the pot to "fine tune" the 2.5
    > second pulses that the 555 will produce.


    Aaargh! I figured the timing components for the 555
    based on seconds, not minutes. Change R1 to 330K,
    R2 to a 500K pot, and C to a 220 uf cap to get 2.5
    _minute_ timing.

    Ed

    >
    > You can also find a diagram of the 4017 at
    > http://www.doctronics.co.uk/4017.htm
    >
    > Connect the output (pin 3) of the 555 to the clock input
    > of the 4017 through a 1K resistor.
    >
    > If this is not clear, I can email a jpg schematic
    > to you.
    >
    > Ed
     
    ehsjr, Oct 3, 2008
    #9
  10. Guest

    On Oct 3, 4:10 am, ehsjr <> wrote:
    > ehsjr wrote:
    > > wrote:

    >
    > >> On Oct 1, 1:02 am, ehsjr <> wrote:

    >
    > >>> wrote:

    >
    > >>>> right what i need is a diagram for the conditions i need... let me
    > >>>> explain

    >
    > >>>> i need to press and release a NO switch and after certain time like
    > >>>> say 15 mins i need it to engage a relay for say 5 mins then disengage
    > >>>> the relay and wait for the push button again after.
    > >>>> **i could go as far as opto-isolation as it doesnt need much current
    > >>>> for switching but it does need seperation

    >
    > >>>> many thanks
    > >>>> Ian

    >
    > >>>> ps i seen many diagrams with this tan and other but there talking
    > >>>> beyond what need to know.. i got a strong guess i need 2x555 and
    > >>>> perhaps what they call a "flip flop" circuit unless anyone has a
    > >>>> better idea?

    >
    > >>> Getting 15 minutes from a 555 reliably is tough. Instead,
    > >>> set the 555 to run astable at ~2.5 minutes, and use its
    > >>> output as the clock for a 4017.

    >
    > >>> Diode or all of the 4017 outputs except count 9 to the base
    > >>> of an NPN and a 1K. An example of the "diode or" is best seen
    > >>> in the second partial schematic below. The schematics are
    > >>> representative of what you need to do, not complete. The N/O
    > >>> switch also connects to the commoned cathodes of the diodes.
    > >>> The NPN controls power to the circuit. Pressing the button
    > >>> turns the NPN on, and the 4017 keeps it turned on until the
    > >>> count reaches 9, in ~ 20 minutes. Diode or counts 7 and 8
    > >>> to another NPN through a 1K - that transistor can control a
    > >>> relay to give you you a ~ 5 minute output.

    >
    > >>> NPN
    > >>> +12 ---+---+ +------- Vcc to 555 and 4017 and relay
    > >>> | c\ /e
    > >>> | ---
    > >>> | |
    > >>> | [1K]
    > >>> | | Dx
    > >>> +-o o-+------|<---Counts 0-8 from 4017,
    > >>> N/O | each count thru its own
    > >>> | diode (Dx)
    > >>> [33K]
    > >>> |
    > >>> Gnd ---------+

    >
    > >>> The 33K ensures the transistor turns off when the 4017
    > >>> is not counting from 0 through 8.

    >
    > >>> For your 5 minute output:

    >
    > >>> +Vcc ----+
    > >>> |
    > >>> [Relay]
    > >>> | +---|<---Count 8 from 4017
    > >>> \c |
    > >>> NPN |---[1K]---+---|<---Count 7 from 4017
    > >>> /e |
    > >>> | |
    > >>> Gnd -----+----[33K]---+

    >
    > >>> The relay needs a diode across it with the cathode
    > >>> connected on the + side.

    >
    > >>> Ed

    >
    > >> Right, so basically I connect to the npn transistor by diodes (or
    > >> leds?) with pins 1, 2, 3, 4, 7 and 10

    >
    > > Yes those are the correct pins, but you need to add
    > > more pins - pin 9 and pin 10. That will give you
    > > counts 0,1,2,3,4,5,6,7, and 8. Each count stays
    > > active for 2.5 seconds, so the timing cycle is
    > > 2.5 * 8 = 20 seconds. Each output (count) goes +
    > > for 2.5 seconds. The output is connected through
    > > a diode, and the cathodes of t6he diodes are connected
    > > together. The base of the NPN is connected to the cathodes
    > > through a 1K resistor.

    >
    > Groan - you wanted 2.5 minutes, not seconds. Change the
    > word seconds to minutes above. Correction to the 555
    > components appears below. Also, I added 1 pin too
    > many. You want counts 0,1,2,3,4,5,6 and 7, so you need
    > to add pin 10 (not pins 9 and 10 - do not add pin 9).
    >
    >
    >
    > > The collector of that NPN is connected to the plus
    > > side of whatever power supply you are using. The power
    > > supply needs to be between 5 and 15 volts. The emitter
    > > of that NPN provides power for the 4017, the 555 and the
    > > relay.

    >
    > >> and use pins 5and 6 connected to

    >
    > > No, use pins 6 and 9.

    >
    > ^^^ ^^ ^^
    > Yes, use pins 5 and 6
    >
    >
    >
    > > They are connected to 2 more diodes.
    > > Those two diodes als have their cathodes connected to a 1K
    > > resistor, and the other side of that 1K resistor is connected
    > > to the base of another NPN transistor. No opto isolator is
    > > needed or used.

    >
    > >> the npn and opto-isolation device instead for switching another npn
    > >> for a relay. It�s the same as a diode but using less power than the
    > >> relay, so I figured that out its now the 555 timer connection and
    > >> circuit to the cmos chip.

    >
    > >> The tech sheet I was looking at started from output 0, this means
    > >> pins 9 and 11 don�t use (just incase someone else finds this useful)

    >
    > > You will use pin 9, but you won't use pin 11

    >
    > >> right the 555 pinout?
    > >> 1,is gnd
    > >> 2, E from npn
    > >> 3, connect to hi-low on cmos
    > >> 4,dont use
    > >> 5,dont use
    > >> 6, connect to ground?
    > >> 7, connect c+r to 1
    > >> 8, V+

    >
    > >> please can you confirm I have this correct

    >
    > > No - see below.

    >
    > >> Questions.
    > >> What do the diodes and the switch connect to on the npn,

    >
    > > The base of the NPN, through a 1K resistor.

    >
    > >> I really need
    > >> a better drawing.
    > >> I did see on the tech sheet of the cmos chip it sounds like that the
    > >> output pins give out different power or something as it suggests that
    > >> only certain pins to be used to time another decade counter cmos chip,
    > >> is this right if so do I still use diode to the npn?

    >
    > > For a diagram of the 555, see this url:
    > >http://www.doctronics.co.uk/555.htm#astable

    >
    > > You will select R1, R2 and C to set the timing for
    > > ~ 2.5 seconds. Start with R1 = 33K and use a 50K
    > > pot for R2. For C, use a 33 uF electrolytic.
    > > You can adjust the pot to "fine tune" the 2.5
    > > second pulses that the 555 will produce.

    >
    > Aaargh! I figured the timing components for the 555
    > based on seconds, not minutes. Change R1 to 330K,
    > R2 to a 500K pot, and C to a 220 uf cap to get 2.5
    > _minute_ timing.
    >
    > Ed
    >
    >
    >
    > > You can also find a diagram of the 4017 at
    > >http://www.doctronics.co.uk/4017.htm

    >
    > > Connect the output (pin 3) of the 555 to the clock input
    > > of the 4017 through a 1K resistor.

    >
    > > If this is not clear, I can email a jpg schematic
    > > to you.

    >
    > > Ed


    lol i fell asleep sending an email again... didnt see your latest post
    but the latest mail has an interesting section that the last 2 output
    pins still need to be connected to the first npn otherwise the 555 and
    4017 will power down.. thus i think it also needs to be connected to
    another diode to the npn
    to stop power coming back from the other outputs and still allow the
    latter 2 to send power to both... i really need to get a breadboard
    and the components..

    thanks for the better pictures and diagrams in the links that helped
    loads! im just awake at 14:30 ahh i got work soon :/ well catch you
    later like erm 3 am? UK time :D
     
    , Oct 4, 2008
    #10
  11. Guest

    Right, an update
    i have created a diagram using m$ paint with BIG thanks to ehsjr's
    help on this subject!
    if interested email me and i shall mail you the diagram.

    this is for a time delay for the digi-safes, i think it should be
    good, i was thinking of changing the npn2 for opto-isolator to break /
    make the connection with the solenoid so you still need to type the
    pin in etc just only works after the 15 mins are up and in to the 5
    min stage..

    well so we have it
     
    , Oct 6, 2008
    #11
  12. Guest

    On Oct 6, 2:23 pm, John Fields <> wrote:
    > On Mon, 06 Oct 2008 06:22:10 -0500, John Fields
    >
    >
    >
    > <> wrote:
    > >On Mon, 29 Sep 2008 18:28:35 -0700 (PDT), wrote:

    >
    > >>right what i need is a diagram for the conditions i need... let me
    > >>explain

    >
    > >>i need to press and release a NO switch and after certain time like
    > >>say 15 mins i need it to engage a relay for say 5 mins then disengage
    > >>the relay and wait for the push button again after.
    > >>**i could go as far as opto-isolation as it doesnt need much current
    > >>for switching but it does need seperation

    >
    > >>many thanks
    > >>Ian

    >
    > >>ps i seen many diagrams with this tan and other but there talking
    > >>beyond what need to know.. i got a strong guess i need 2x555 and
    > >>perhaps what they call a "flip flop" circuit unless anyone has a
    > >>better idea?

    >
    > >---
    > >15 minutes is kinda tough to get out of a 555 reliably so,
    > >somewhat akin to Ed's scheme, (but with gates instead of diodes:)

    >
    > >news:

    >
    > >Since you Google Groupers can't access USENET binaries I'll email you a
    > >.pdf of the schematic.

    >
    > .
    > .
    > .
    >
    > >Do you need/want a circuit description?

    >
    > ---
    > What the heck...
    >
    > Here's how it works:
    >
    > When power is first turned on, U5-1 and U5-10 will be held low until C2
    > charges up through R3. That will force U5-5 low and U5-9 high,
    > resetting the latch comprising U1C and U1D, and U1-13 going low will
    > keep Q1 and K1 turned off.
    >
    > U5-9 going high will also create a momentary high-going spike by being
    > differentiated by C3 and R4, and will set the latch comprising U3A and
    > U3B. U3-4 being forced high, then, will reset the counter, U2, and
    > disable the astable multivibrator clock oscillator comprising U1A and
    > U1B.
    >
    > The circuit will remain stable in this state until S1 is made, whereupon
    > the latch (U3A-U3B) will be reset and U3-4 going low will enable the
    > clock oscillator and U2, allowing it to accumulate counts.
    >
    > After counting for 15 minutes Q10, Q11, Q12, and Q13 will all be high.
    >
    > That state will be decoded by the AND gates U4A, U4B, and U4C, with the
    > result being that U4-9 will go high at that time.
    >
    > That high will be presented to the "D" input of U5A and, after the next
    > high-going transition of U2-7 will appear at U5-5, the "Q" output of
    > U5A.
    >
    > U5A going high will set the latch U1C-U1D, forcing U1-13 high, which
    > will turn on Q1 and energize the relay.
    >
    > One minute later, Q10, Q11, Q12 and Q13 will all go low and Q14 will go
    > high. Then, four minutes later, Q12 will go high and, when it does,
    > U4-11 will go high. That high will propagate through U5-B with the next
    > rising edge of U2-7 and will reset the latch U1C-U1D.
    >
    > That will turn off Q1 and K1, set U3A-U3B, reset and disable U2, and
    > stop the clock oscillator U1A-U1B until S1 is again made and the cycle
    > started anew.
    >
    > The clock oscillator frequency is determined by considering that if 15
    > minutes can cause a counter's four next-to-highest MSBs to be set:
    >
    > 1 1 1 1 0
    >
    > then one minute later The MSB will be set:
    >
    > 0 0 0 0 1
    >
    > and, four minutes later, the "4" bit will also be set:
    >
    > 0 0 1 0 1
    >
    > and all that'll be needed to turn the relay on will be to decode the
    > "15" (1 1 1 1 0) state and, to turn it off, to decode the "20"
    > (0 0 1 0 1) state as explained previously.
    >
    > Now, since U2 is a 14 stage binary counter and we need the MSB to go
    > high after 16 minutes, (960 seconds) we can make a table:
    >
    > STAGE PERIOD
    > -------|--------
    > Q14 960
    >
    > Q13 480
    >
    > Q12 240
    >
    > Q11 120
    >
    > Q10 60
    >
    > Q9 30
    >
    > Q8 15
    >
    > Q7 7.5
    >
    > Q6 3.75
    >
    > Q5 1.875
    >
    > Q4 0.938
    >
    > Q3 0.469
    >
    > Q2 0.234
    >
    > Q1 0.117
    >
    > CLK 0.059
    >
    > The period of the clock oscillator will be about 1.8RC, so if we
    > arbitrarily set the capacitance to 0.1µF and the period to 0.059
    > seconds, we can solve for the resistance:
    >
    > T 0.059s
    > R = ------- = --------------- = 327,777... ~ 328K ohms
    > 1.8C 1.8 * 1.0E-7F
    >
    > Since the frequency (about 17 Hz) will probably need to be adjusted, a
    > 750K pot will put it right at about midpoint of the pot's range.
    >
    > JF


    thanks john, i did try to email you but it bounced. im sorry this
    looks like what i put in the ps on my original posting, it absoloutly
    confuses the heck out of me! i see - or nand and nor gates in the
    discriptions and have no idea, give me a component like i dunno erm ??
    a general npn or even the 555, 4017 ic i understand that.
    if you could suply a basic components list (Ed's list is basic, some
    may see it crude- but it works not too many components and many the
    same... helps when buying as you usually have to buy 10 of something
    not just 1 resistor say. the way its composed he told me how it works
    but not why it works - no, and nand etc)

    ANYWAY! thanks again, someone reading this will understand and be able
    to use your information, just im not in deep with electronics.
    regards Ian
     
    , Oct 7, 2008
    #12
  13. neon VIP Member

    Joined:
    Oct 21, 2006
    Messages:
    1,325
    this is crap pin 4 ,5 don't use meaning open. crap
     
    neon, Oct 7, 2008
    #13
  14. ehsjr Guest

    wrote:
    > On Oct 6, 2:23 pm, John Fields <> wrote:
    >
    >>On Mon, 06 Oct 2008 06:22:10 -0500, John Fields
    >>
    >>
    >>
    >><> wrote:
    >>
    >>>On Mon, 29 Sep 2008 18:28:35 -0700 (PDT), wrote:

    >>
    >>>>right what i need is a diagram for the conditions i need... let me
    >>>>explain

    >>
    >>>>i need to press and release a NO switch and after certain time like
    >>>>say 15 mins i need it to engage a relay for say 5 mins then disengage
    >>>>the relay and wait for the push button again after.
    >>>>**i could go as far as opto-isolation as it doesnt need much current
    >>>>for switching but it does need seperation

    >>
    >>>>many thanks
    >>>>Ian

    >>
    >>>>ps i seen many diagrams with this tan and other but there talking
    >>>>beyond what need to know.. i got a strong guess i need 2x555 and
    >>>>perhaps what they call a "flip flop" circuit unless anyone has a
    >>>>better idea?

    >>
    >>>---
    >>>15 minutes is kinda tough to get out of a 555 reliably so,
    >>>somewhat akin to Ed's scheme, (but with gates instead of diodes:)

    >>
    >>>news:

    >>
    >>>Since you Google Groupers can't access USENET binaries I'll email you a
    >>>.pdf of the schematic.

    >>
    >>.
    >>.
    >>.
    >>
    >>
    >>>Do you need/want a circuit description?

    >>
    >>---
    >>What the heck...
    >>
    >>Here's how it works:
    >>
    >>When power is first turned on, U5-1 and U5-10 will be held low until C2
    >>charges up through R3. That will force U5-5 low and U5-9 high,
    >>resetting the latch comprising U1C and U1D, and U1-13 going low will
    >>keep Q1 and K1 turned off.
    >>
    >>U5-9 going high will also create a momentary high-going spike by being
    >>differentiated by C3 and R4, and will set the latch comprising U3A and
    >>U3B. U3-4 being forced high, then, will reset the counter, U2, and
    >>disable the astable multivibrator clock oscillator comprising U1A and
    >>U1B.
    >>
    >>The circuit will remain stable in this state until S1 is made, whereupon
    >>the latch (U3A-U3B) will be reset and U3-4 going low will enable the
    >>clock oscillator and U2, allowing it to accumulate counts.
    >>
    >>After counting for 15 minutes Q10, Q11, Q12, and Q13 will all be high.
    >>
    >>That state will be decoded by the AND gates U4A, U4B, and U4C, with the
    >>result being that U4-9 will go high at that time.
    >>
    >>That high will be presented to the "D" input of U5A and, after the next
    >>high-going transition of U2-7 will appear at U5-5, the "Q" output of
    >>U5A.
    >>
    >>U5A going high will set the latch U1C-U1D, forcing U1-13 high, which
    >>will turn on Q1 and energize the relay.
    >>
    >>One minute later, Q10, Q11, Q12 and Q13 will all go low and Q14 will go
    >>high. Then, four minutes later, Q12 will go high and, when it does,
    >>U4-11 will go high. That high will propagate through U5-B with the next
    >>rising edge of U2-7 and will reset the latch U1C-U1D.
    >>
    >>That will turn off Q1 and K1, set U3A-U3B, reset and disable U2, and
    >>stop the clock oscillator U1A-U1B until S1 is again made and the cycle
    >>started anew.
    >>
    >>The clock oscillator frequency is determined by considering that if 15
    >>minutes can cause a counter's four next-to-highest MSBs to be set:
    >>
    >> 1 1 1 1 0
    >>
    >>then one minute later The MSB will be set:
    >>
    >> 0 0 0 0 1
    >>
    >>and, four minutes later, the "4" bit will also be set:
    >>
    >> 0 0 1 0 1
    >>
    >>and all that'll be needed to turn the relay on will be to decode the
    >>"15" (1 1 1 1 0) state and, to turn it off, to decode the "20"
    >>(0 0 1 0 1) state as explained previously.
    >>
    >>Now, since U2 is a 14 stage binary counter and we need the MSB to go
    >>high after 16 minutes, (960 seconds) we can make a table:
    >>
    >> STAGE PERIOD
    >>-------|--------
    >> Q14 960
    >>
    >> Q13 480
    >>
    >> Q12 240
    >>
    >> Q11 120
    >>
    >> Q10 60
    >>
    >> Q9 30
    >>
    >> Q8 15
    >>
    >> Q7 7.5
    >>
    >> Q6 3.75
    >>
    >> Q5 1.875
    >>
    >> Q4 0.938
    >>
    >> Q3 0.469
    >>
    >> Q2 0.234
    >>
    >> Q1 0.117
    >>
    >> CLK 0.059
    >>
    >>The period of the clock oscillator will be about 1.8RC, so if we
    >>arbitrarily set the capacitance to 0.1µF and the period to 0.059
    >>seconds, we can solve for the resistance:
    >>
    >> T 0.059s
    >> R = ------- = --------------- = 327,777... ~ 328K ohms
    >> 1.8C 1.8 * 1.0E-7F
    >>
    >>Since the frequency (about 17 Hz) will probably need to be adjusted, a
    >>750K pot will put it right at about midpoint of the pot's range.
    >>
    >>JF

    >
    >
    > thanks john, i did try to email you but it bounced. im sorry this
    > looks like what i put in the ps on my original posting, it absoloutly
    > confuses the heck out of me! i see - or nand and nor gates in the
    > discriptions and have no idea, give me a component like i dunno erm ??
    > a general npn or even the 555, 4017 ic i understand that.
    > if you could suply a basic components list (Ed's list is basic, some
    > may see it crude- but it works not too many components and many the
    > same... helps when buying as you usually have to buy 10 of something
    > not just 1 resistor say. the way its composed he told me how it works
    > but not why it works - no, and nand etc)
    >
    > ANYWAY! thanks again, someone reading this will understand and be able
    > to use your information, just im not in deep with electronics.
    > regards Ian


    While you might not understand it at first glance, you could
    learn something from John's post, if you are interested. What
    John posts is always of value, and that is particularly true
    in this case. Essentially, the internal circuitry in the 4017
    works pretty much the same as the circuit John posted. When
    you understand what he wrote, you'll also understand what is
    going on inside a 4017 - and more.

    Ed
     
    ehsjr, Oct 8, 2008
    #14
  15. Guest

    On Oct 8, 10:52 pm, John Fields <> wrote:
    > On Wed, 08 Oct 2008 18:42:59 GMT, ehsjr <> wrote:
    > >While you might not understand it at first glance, you could
    > >learn something from John's post, if you are interested. What
    > >John posts is always of value, and that is particularly true
    > >in this case. Essentially, the internal circuitry in the 4017
    > >works pretty much the same as the circuit John posted. When
    > >you understand what he wrote, you'll also understand what is
    > >going on inside a 4017 - and more.

    >
    > ---
    > Thanks, Ed, that's very kind of you. :)
    >
    > JF


    yes i absoloutly agree! that is why i also thanked john (not like
    some who just put people down) someone who wants and has time to learn
    indepth about the way it works, me personally i have many hobbies and
    i also start learning some stuff and then i just give it in as its too
    confusing or what might seem on the top. i have so many unfinished
    projects unfinished because things are too costly or i dont have the
    correct tools or just loose interest...
    if someone wants to look into my latter project, was kind of
    interesting all i needed was someone with a vac-forming machine and i
    could of easly had a final product out of beta range, it was Optical
    ornamentation "to find hidden cameras" even hidden cameras that dont
    work.... its called optical augmentation
     
    , Oct 8, 2008
    #15
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. John Albers
    Replies:
    14
    Views:
    689
    Soeren
    Apr 30, 2004
  2. Mr. J D
    Replies:
    8
    Views:
    3,425
    jasen
    Aug 17, 2006
  3. Ben Lessani
    Replies:
    0
    Views:
    1,798
    Ben Lessani
    Feb 11, 2004
  4. Ben Lessani
    Replies:
    10
    Views:
    701
    Ben Lessani
    Feb 23, 2004
  5. scottjge

    555 Timer, 556 Timer or Atmel micro

    scottjge, Sep 3, 2011, in forum: Electronic Projects
    Replies:
    5
    Views:
    852
    scottjge
    Sep 7, 2011
Loading...

Share This Page