I am building a house alarm and want to make it wireless. I am using this Transmitter Receiver pair from sparkfun:
I pick this part because of the low power consumption over the xbee and it is half the price. I want the transmitter to send a high when the door is open and low when closed which it does. However, when I turn off the transmitter the receiver receives random data. So I can not write code to look for a specific value because I can get that number when the transmitter is off. Any suggestions for me?
Thanks
P.S. I do not want to add a microcontroller on the transmitter side.
Well... not adding an MCU on the transmitter side opens up alot of.. problems.
You may need an MCU.. (I'm sure somebody else will prove me wrong)
But then again, if you have the Transmitter transmitting, and you can tell when it's the transmitter and nothing else.. you could just program to listen for what the transmitter is transmitting.. ( would be like 942 times easier with an MCU on the transmitter, that way you can choose what to send out, and when.)
You may not be able to filter out the noise.. if you don't know what you're listening for.
Here's a link I found while I was trying to set up my RF set a while back: