Arduino + Compass = I know which way is North!
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A-Bog’s got a writeup of code he grabbed from the sparkfun forums to get the arduino to talk to their compass. – Link
Sparkfun’s compass is cute, but a tad spendy. – Link
Hoeken had mentioned a $15 dollar digital compass and I found the link to get the compass, I bought one! – Link
Here’s a little circuit to play with it. – Link
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I like it! Cheap is good.
Here’s the module I used on the poor man’s GPS:
At $30, it’s a bit more expensive, but the trade off is in having a serial interface, and ridiculously high precision.
The downside is that you need an arctangent-like function to make the serial data usable. It spits out two readings that need to be combined:: eg:
angle = x ATN -y ‘ Convert x and y to brads
angle = angle */ 360
For some micros, this is easy, others you can probably fake it out with a lookup table.
Hope this is somewhat useful,