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need help on relay project

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jonjay

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Hi,
I'm working on a project and I could really use some help with the design and choosing parts. Basically I need to create a system in which three relays are triggered wirelessly by three buttons. These relays only need to provide for about 30mW and simply provide for an on/off function. On one side I was planning on using three aforementioned buttons, a microcontroller, some kind of power source, and and RF transmitter. On the other side I was thinking of using an RF receiver, another microcontroller, another power source, and three aforementioned relays. Space is an issue as well, so the parts should be relatively small. I'm also hoping to keep the project fairly cheap.
Thank you for any help you can provide me.
 

hanif

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Hi,

i am attaching sone links below from which you can get idea but before this just read follwing


first of all simplified Your project by assuming you are using a o2 micro controller cards. one has 03 buttons , another has 03 relays.
both cards are connected via a rs232 protocol (serial communication) using serial port cable.
the main thing is the programming of micro controllers. steps are as follows

  1. read buttons (03)
  2. send the button state via rs232 cable to another u cont
  3. decode the state on another side
  4. on/off necesary port pin

controller selection 8051


links are as follows;

12: Volt On Off Relay Switch
**broken link removed**

SwitchLinc Relay - INSTEON Remote Control On/ Off Switch (Non ...

**broken link removed**

Wireless Remote Control Relay Application Using RF Remote Controls
Wireless Remote Control Relay Application Using RF Remote Controls
 

jonjay

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Thank you very much for your input. I think I should clarify a few things though.
First of all, size is an issue.
I'm trying to integrate the buttons into a ski glove, and the other half of the system should be contained by a pocket.
Also, the capacity and power of the system can be relatively low. We're only talking about switching 30mW on and off.
I believe I will need one microcontroller interpretting the RF signals and controlling the relays, and one interpretting the buttons being pressed and sending the signal to the RF transmitter. These two microcontrollers will therefore not be connected by a wire.
However, I am not set in stone with the set-up of this system. Input is greatly appreciated.
Thank you.
 

wizpic

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This is a good starting place if you want to use RF
Nigel's PIC Tutorial Page
Look at Tutorial 12 that is about RF, I know it may be a bigger pic but you could always change it.
Why not just use a transistor if your only switching 30mw that way you don't need relays which will cut the cost down
you could start here for looking at transistors
Transistor Circuits
That should get you started :grin:
 

jonjay

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Thanks for the suggestion of using transistors instead. That sounds like a great idea. Is there any way to use a transistor without having an amplification of the current? Also, if anyone could provide me any links to specific parts that would be great.
Thanks.
 

wizpic

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Thanks for the suggestion of using transistors instead. That sounds like a great idea. Is there any way to use a transistor without having an amplification of the current? Also, if anyone could provide me any links to specific parts that would be great.
Thanks.
Becuase it is low current your switching you do not need to carry out amplification. you would just use it as a switch. If you read my post you would see that I posted losts of information what you require.
I would recommend you do some research and home work has the links i provided are just what you need including shcematics and others have also posted links to some good sites you just need to read up on them
We are here to off help but not do the work for you :-o:wink:
 

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