hello
I came across this video and would like to build this but can't find the scematics or code can anybody help?
Guess I am just a digital junkie. I agree that the analog route is probably cheaper. From the pic it seems that it is just a electec mic with an arduino, protoshield, resistors, and some leds. I have all those on hand today and wanted to build it. I guess I need to pick up some op amps and transistors to do the analog version. I was also thinking if I got the basic version down I could use the arduino to make something even better and more powerful
bryan
thanks for that sparkfun link
thats a cool chip
From the pic it seems that it is just a electec mic with an arduino,
The output from an electec mic is not enough to drive the arduino directly you will need some sort of amplifier.
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1289765675
In the post, you'll find links to both the project and the FFT code (which was posted to Arduino forums this past September by another user). I made a spectrum analyzer with video display (tv out) using the code. If you examine the lib code and the code I used, it should explain itself.
A simple transistor amplifier is all that is needed for the electret, I used a single 3904 and was able to get usable signal for a/d conversion and FFT. I'll post the schematic, but there's plenty of posts with circuits for interfacing the microphone to an analog pin. The code as given breaks the sampled sound into 64 bands of approximately 500Hz width, giving a range to 32kHz.. well out of human hearing range. Dumps it back into the source array. I just take that array and map it into simple graphics using the TVout library, found in the Playground.
As presented at the moment, you will need to cut and paste the code for the library for the FFT from the original post... I think I will be at least making files and making them available via my blog so that others can use the code.. it's very useful. I didn't write the lib.. all I've done is put it to an entertaining use.
Good luck!