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PIC suggestions needed

Discussion in 'Electronic Basics' started by Wes, Mar 14, 2009.

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  1. Wes

    Wes Guest

  2. Yes, excellent way to start.
    Yes, plenty of them. Go to the Microchip website and serach for chips that
    have an ADC in them.

    The PIC16F690 in that starter kit above has 12 channels of 10bit ADC.

    Dave.
     
  3. default

    default Guest

    Pickit 2 is the basic programmer. It can't read the protected areas
    but can overwrite a protected area with new code.

    The PicStart Plus can do it all including clone chips but for ~$200
    from Microchip. The good news is that there are clones of the
    picstart plus for lots less. They use the same free microchip
    software and are supported with firmware updates.

    http://www.sparkfun.com/commerce/product_info.php?products_id=4

    But search for '"picstart plus" clones' I found them for ~$50
    --
     
  4. Jamie

    Jamie Guest

  5. Yes, excellent way to start.
    Yes, plenty of them. Go to the Microchip website and serach for chips that
    have an ADC in them.

    The PIC16F690 in that starter kit above has 12 channels of 10bit ADC.

    Dave.
     
  6. Randy Day

    Randy Day Guest

    Absolutely two thumbs up. If you get
    tired of using the starter board, the
    programmer can program your chips
    in-circuit.

    The USB version also programs a heck of
    a lot faster than the serial ones the
    RnD types use at work.

    If it does stop working, the PICKit
    software has the option of downloading
    the OS back into the programmer. That's
    brought my unit back to life on more
    than one occasion, after an 'oops' on
    the circuit board...
    Many PIC's have both A/D and comparator
    inputs.

    The PIC16F690 that comes (or did come)
    with the Starter Kit has A/D capability,
    and the tutorial has a small program to
    read the potentiometer on the starter
    board. Some PIC micros have up to 16 A/D
    channels.

    HTH
     
  7. Nobody

    Nobody Guest

    Yep. As well as in-circuit programming, it supports in-circuit debugging
    (with debug-capable ICs, or a debug header, although debug headers
    aren't cheap), supplies variable-voltage power to the test circuit, and
    can be used as a UART to talk to the PIC (although the included demo board
    isn't wired for this; you need to connect pins 4+5 on the PICKit2 to pins
    10+12 on the PIC16F690 for UART use, versus pins 19+18 for programming).

    Also, see the thread "Learning PIC: where to start" on SED for
    miscellaneous advice.
    Yes. A large proportion of PIC chips in all families have an ADC,
    including the 16F690 supplied with the demo board.

    AFAICT, they usually (invariably?) only have one ADC, but you can
    multiplex it between pins (the number of pins which can be configured as
    analogue inputs varies between models). This won't be a problem unless you
    need synchronised samples.
     
  8. Clint Sharp

    Clint Sharp Guest

    PICKit2, excellent way to start and the board can also be used to
    program different PIC chips if you remove the socketed chip it's
    supplied with. If you intend doing this I'd recommend you get hold of a
    second 20 pin socket to save the one on the board (plug it into the one
    on the board and fit chips into that one).
    Plenty, if you buy the kit you mentioned from Newark then it comes with
    a CD (which you can download from Microchip's site) that contains the
    data sheet for the chip on the board and also a few tutorials, one or
    more of which deal with analogue input.
     
  9. IanM

    IanM Guest

    You don't really need the 8/12/20 pin demo board. It doesn't take the
    18 pin PICS of which the most useful is the 16F88. The 16F88 is a great
    chip for getting into PIC programming as it is full supported by the
    PICKIT 2 *INCLUDING* debugging with no extra emulation headers or
    adaptors required. The 16F87 and 88 are the *ONLY* PICs of 20 pins or
    under that have full debug support without needing an expensive ICD
    header and adaptor. The 16F88 has SPI/I2C, UART, 10 bit 7 channel ADC,
    2 comparators, 3 timers and a 256 byte data EEPROM. Its got as much
    RAM and program memory as any low end part and more than most.

    Other good PICS for getting started with are the 16F886 if you want a 28
    pin part and the 16F887 for a 40 pin part. Both are feature rich, with
    debug support built in. Just make sure you get PDIP (either 300 or 600
    mil) or SPDIP packaged parts if you want to breadboard them.

    All are easily breadboardable with the PICKIT2 if you make up a simple
    8" cable with a 0.1" 6 pin header plug on one end to fit the connector
    on the Pickit 2 and individual pins to plug into the breadboard on the
    other. You will save $15 *not* getting the kit with the demo board
    which can be well spent on few PICS, a couple of 4Mhz crystals for when
    you need a spot-on clock frequency and a strip of 0.1" header pins and
    some small bore heatshrink sleeving to make up the cable you will need.

    If you INSIST on having a demo board, get the Debug Express kit. It's
    demo board has a surface mount 16F887 with a button, a pot for the ADC
    and eight LEDs. All pins are brought out to accessable through hole
    locations so you can add some turned pin socket strips and patch it into
    any project you are breadboarding, space to put a crystal, or resonator
    for the clock (though the chip has a pretty good internal oscillator),
    space for a 32 KHz crystal for Timer 1 for RTC applications and a
    surface mount prototyping area with more than enough space to assemble a
    MAX232 or similar level converter if you want an on-board PC compatible
    serial interface and two 11 pin + power and ground locations for
    headers to get signals in and out from the prototyping area.
     
  10. default

    default Guest

  11. Wes

    Wes Guest


    That chip sounds like fun to play with also. Thanks for the link.

    Wes
     
  12. default

    default Guest

    It's loads of fun. 2-3 AA cells, solderless breadboard, switches,
    leds, pots, toy motors and I can play for hours. Where can you get
    that much entertainment for $4?

    I just had one of the controls on my electric range go out. A picaxe
    is now replacing it. Solid state relay does the heavy lifting, a 20
    amp DPDT for safety, and it modulates the power and flashes lights to
    show what the power setting is. All for less than the cost of a new
    electromechanical "infinite" switch.

    Phil Anderson is a good source for the chips, spark fun and ebay some
    others in the US.
    www.phanderson.com
    www.rev-ed.co.uk for software downloads

    Kicchip makes a similar controller with the boot loader pre burned on
    it for the same price range. They don't have the killer forum and the
    excellent support the 'axe does, but they do have a killer programming
    application. (not compatible with axe chips though)

    Arduino is another good one, little more money ($15 and up) but vastly
    more power.
    --
     
  13. Wes

    Wes Guest

    I ordered a couple from Sparkfun yesterday.
    Sweet! Excellent solution. Adaptable to a washer or dryer timer going on it's back.

    Phanderson has interesting items. I'll keep it in mind.
    I'll give it a look also.
    Damn, sounds like a lot of choices.

    Thanks,

    Wes
     
  14. default

    default Guest

    I liked it so much more than the old ones that I built a second and
    replaced a perfectly good control. Tricolor leds to signal the power
    level and a preheat function.
    What he sells in the way of components are usually priced low too.
    Lot of good interface info on the site too.
    The 08M 'axe and you can do most of what you want. I've got two time
    lapse cameras working with an 08M and 14M. Arduino allows basic and C
    programming, but its a steeper learning curve and the support isn't
    near as good as the 'axe.
    --
     
  15. default

    default Guest

    PS I bought the book "Programming and Customizing the Picaxe Micro
    controller" by David Lincoln. Mine is ISBN: 0-07-145765-8

    List price $40 - I paid $12 shopping for it. It is worth getting in
    spite of its many shortcomings. NOT worth $40 though.

    The frustrating things - Reved puts out new model chips faster than
    the book gets updated, and the book is a one size fits all - slightly
    different for the basic stamp, Oopic, and other controllers. The
    index is only good for the first 5th of the book, anything after may
    be on a different page than the index says or not there at all.
    --
     
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