help to a beginner

[Nimda]

Hello . I am a beginner in eletronics . i am designing a computer program . i need a circuit that can do some simple commands . can any one help me how to do it ?
details of circuit :
it must a simple radio transmitter that with sender i push a button and reciver gets it and do a simple command for example turn on a little dc motor .
Thank youuu.

 

[Martaine2005]

Hi, something like this?
http://www.ebay.co.uk/itm/4-Channel...583?pt=LH_DefaultDomain_3&hash=item54159bb02f

EDIT: Oh sorry, I misread the post. You want to control it via the computer program.
I am sure somebody will be able to help you soon.
Martin.

 

[Nimda]

Hi the computer program only defines what the circuit do when it recives a special message . ( and if it is possible define the sender's message )

 

[Martaine2005]

Yes, the circuit will be computer controlled.
There is another section on this forum for programming / pic / arduino etc.
Sit tight and somebody will help you. I however cannot. Sorry.
Martin.

 

[Harald Kapp]

a simple radio transmitter that with sender i push a button and reciver gets it and do a simple command for example turn on a little dc motor

Where does the computer and your program come into play in this scenario?

Hi the computer program only defines what the circuit do when it recives a special message . ( and if it is possible define the sender's message )

This is rather general and doesn't help a lot to understand your problem. Can you be more specific?

• What kind of transmission do you need (radio or infrared)?
• What is the maximum distance to be expected for the transmission?
• Do you need to operate several of these transmitters independently from one another or just a single one?
• What do you mean by "define the sender's message"?
• On top of this: Do you need the transmission to be secure (so no one else can interrfere) or is this an uncritical path (that may be easily hacked)?

Assuming the receiver is attached to a computer (for your program to run):

• What kind of computer will you be using (PC, arduino, blackberry etc.)?
• How is the receiver to be connected to the computer (serail port, control pin ...)?

The more detail for your project you give us, the more likely you will receive a useful answer.

Regards,
Harald

 

[Nimda]

Thank you for your noticing. Look the whole is like this : I must have sender with some buttons that each button do something specific. When I push a button a message ( I meant can I send a message like "pull command" to a circuit and it understand?) Must be sent to the receiver ( radio signals and a range between 10 to 20 or 30 meters ) then receiver gives the message to the circuit ( mean the thing that can process commands)
And circuit do it like turning on a dc motor.
The connection if be secure it's better. And the thing that you said the reciver is not always connected to a pc. the circuit that process the recived commands must get the program and do it for it self. The program must be on itself and it runs it .
Thank you so much.

 

[Nimda]

I searched about arduinos I think they can help is right?

 

[BobK]

If the commands are nothing more complicated than turning devices on or off, a device like the one linked in post #2 does everything you need.

If not, you need to give us more information about what you are trying to do.

Bob

 

[Nimda]

The commands are on off changing the motor speed or direction . Turning on a device conneted to it and turn it off. Commands are in this range of simplicity. Thank you.

 

[Arouse1973]

What type of connection are you going to use to control this transmitter PCB? USB, Serial port, Ethernet etc.
Adam

 

[Nimda]

Do you mean for putting the program on it ? Not different.

 

[Arouse1973]

You are going to use the computer to control a PCB correct? You will have to connect this PCB to the computer somehow. How will you do this?
Adam

 

[Nimda]

It's not different. Usb or serial port.

 

[Arouse1973]

What do you mean it's not different?
Adam

 

[Nimda]

I mean that there isn't duffrenece for me. You say ehich us better.
Ok connecting with usb port.

 

[Arouse1973]

You could use a MAX232 or similar to send data to a RF module that has a built in UART. Look at the easy radio devices or something similar.
Adam

 

[Minder]

I agree the MAX232 is the easiest to implement, the problem is the PC may not have a COM port available, there are USB/RS232 converters available, not all work as well.
M.

 

[Arouse1973]

I agree the MAX232 is the easiest to implement, the problem is the PC may not have a COM port available, there are USB/RS232 converters available, not all work as well.
M.

Yes FTDI devices I have used and work very well. Unless you get a fake one that is

 

[Nimda]

You could use a MAX232 or similar to send data to a RF module that has a built in UART. Look at the easy radio devices or something similar.
Adam

Thank you but can you explain more.? I am a beginner in Electronics.

 

[Arouse1973]

What don't you understand? You have heard of RS232 have you? Easy Radio is a product manufactured by a company called LPRS (low power radio solutions). You need to look these things up on the internet.
Adam