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Arduino FM Radio Transmitter

This following is re-post of an article from my old blog from 2008:

This is an FM radio transmitter I made using an arduino and a NS73M FM Transmitter. I got the idea from an article on hack a day, if you’re interested in building your own you should check out Mike Yancey's page he built the one that made it on hackaday.com and he does a very thorough job of documenting how all the components hook together. I was impressed by the level of finishing he was able to achieve on the housing; it looked like a commercial product. I wanted to see if I could achieve a similar result, it’s amazing what you can do with some simple hand tools. If your patient with the file, you can make perfectly square holes in aluminum.  On my implementation I omitted the de-bouncing circuit that he has connected to his rotary encoder, and I used a two-line display.



Since I omitted the de-bouncing circuit, I couldn’t use the original rotary encoder library since that code uses a hardware interrupt and if you use that without using a debouncing circuit it doesn’t work. I used a rotary encoder library I found on Keith’s Electronics Blog



I used a different LCD library that let me define custom user characters. from here

Update: The default Arduino LCD library lets you define custom characters now



Originally, I had included a 250 MW amplifier, but it put out too much interference, so I removed it.  I compiled the sketch using Arduino 11, not sure if the library's will compile with the newer version. 

Zip with Arduino Sketch and Libraries

 

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