- Thu Aug 20, 2009 3:54 pm
#79252
TheDirty wrote:For $4 you can get a 433Mhz or 915Mhz RFM12B transmitter/receiver. With proper programming you could then create a very simple peer to peer network, polling or time slicing. These modules or pretty sophisticated and if you Google them you can see some people playing with simple network protocols for them.More good info. Thanks. Have you ever done any thing with the multi-transmitter and single receiver setup?
For no money you can simply implement manchester encoding yourself with those cheap rf transmitter/receivers you already have or 2byte -> 3byte encoding in software and skip the hardware encoder/decoder all together.
For the cheap modules I had a simple 2byte -> 3byte scheme written for my microcontroller based on white paper source code from radiotronix. Then I replaced it with code from an Arduino library called VirtualWire. It's an Arduino library, but if you google it, you can find the C source code and it's easy to adapt to any uC, all you need to do is attach it to a hardware timer set to 8x your required bitrate.