May 17th, 2004

I got Windows XP in the mail to replace Windows 2000.

May 16th, 2004

I improved my compiler so that variables can be stored. I also reversed the direction of the zener diode in the schematic in the May 2nd post, which I had backwards.

May 9th, 2004

I connected the strobe lights to the OOPic and wrote some code so that they're controllable from the computer. These will be the visible warning lights required for the Grand Challenge.

May 8th, 2004

I went to RadioShack and got a piezo buzzer for $10. Here are the specs:

108dB Piezo Buzzer operates on 7-14VDC, carrying 150mA current maximum. Buzzer tone rated at 2,400-3,700Hz.

This will be the audible warning device for the Expeditor which is required for the Grand Challenge. I connected it to the OOPic and then wrote some code both on the OOPic and on the computer so it is now controllable from the computer.

May 3rd, 2004

Went to ERI to get a 15V zener diode for the circuit below.

May 2nd, 2004

I read a bit from The Art of Electronics and came up with a voltage regulator circuit:

I'll connect this to a 4" x 12" solar panel and use the regulated output along with the OOPic as a back-up charging system for the battery. Right now the battery's voltage is down to 12V, so I had better charge it up.