Ground

We spent half an hour today debugging the beacon circuit. It was working and then all of a sudden stopped. We hooked up the scope and found that the pulse was around 44khz and it was supposed to be at 36khz. We fixed the code but the receiver still wasn't picking it up. Then we found the problem, we accidentally reversed the  output and ground pins on the detector *facepalm* .  However, if this didn't happen we wouldn't have found the problem with the frequency. Anyway, after reprogramming the beacon, we slightly modified the input capture code that we used with the digital compass to work with the beacon detector. It doesn't really work yet though, so that's what we'll be working on tomorrow.