I don’t want to be a grammar nazi, but when you say “to rotate on a single access” the word you want is ‘axis’ not ‘access’.

Ah here we go. good work

What’s a good book or primer to learn about circuit boards, eprom programming and stuff? Would hack-a-day consider a section to newbies like me who want to pop their heads out from being neck-deep in code all the time?

while using a pic is certainly adequate, isnt it a bit overkill? the linked page mentions BEAM style solar tracking, and i speak from personal experience when i say that such circuits utterly simple, far less expensive, and equally as effective.

search for BEAM with respect to an ivore or a photovore, sunhead, sun tracker, solar tracker, etc

Some good examples: http://costaricabeam.solarbotics.net/Circuits_Main.htm

-steve

Re to #5
nickjohnson, LEDs, function almost like a photodiode. Photodiodes, however, are optimized to detect light not emit it. You’re right though, you won’t see much a signal at all from a LED, your best be would be to use a phototransistor, as this amplifies the signal.

good to see the EV post trend. That project has been posted for YEARS [I used that very site to build mine about 4 years ago]. It works great!

I thought LED meant Light Emitting Diode. How is an LED being used to DETECT Light? Please pardon my ignorance and someone post a reply.

i want more information about sensor. please sent to me please.