Post :
URL : http://hackaday.com/2012/08/23/more-small-radio-modules-for-your-wireless-needs/
Posted : August 23, 2012 at 8:01 am
Author : Brian Benchoff
Tags : ISM band, radio, wireless
Categories : radio hacks, wireless hacks

http://hackadaycom.files.wordpress.com/2012/08/radio1.jpg

In the never-ending pursuit of cheap wireless communication for your microcontroller projects, [kiu] came up with a small board (http://www.schoar.de/tinkering/rfm12trx/) that allows for serial communication via a 433MHz radio link.

[kiu]'s transceiver uses an RFM12 wireless module (http://www.hoperf.com/rf_fsk/fsk/20.htm) available online for just a few dollars. Alongside this module is an ATMega8 and a USB to serial FTDI chip. When [kiu] plugs this board into his computer, he's able to run a terminal, connect to this board, and receive and transmit hex values at 115,200 bps from another one of these boards.

According to [kiu]'s BOM, 10 boards only cost him 180 Euros, or about $225 USD. Considering off-the-shelf solutions such as an XBee could easily cost twice as much, we're thinking [kiu] did a very nice job here.

[kiu] put all the board files, schematics, and code up on his GitHub (https://github.com/kiu/rfm12trx) , ready for your perusal. A very cool build, and very useful for a high altitude balloon, rocket, or wireless sensor build.

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