This instructable will cover how to make a light seeking robot (Photovore), and some robotics and motor control basics. This robot can be built with parts found at the nearest Radio Shack, if you already have an Arduino board and a robotic base. The cost for a five pack of CdS cells (Light dependent resistors) cost $2.99 at Radio Shack. and a 15 pack of NPN transistors (very useful later on) are also $2.99. Of all these parts, we will only need two NPN transistors and two CdS cells.
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Step 1: Materials
2 CdS cells
2 NPN transistors
2 current limiting resistors for the transistors (I used 1k ohm (brn - blk - red) )
2 flyback diodes. (1n4001 - 1n4003). You can scavenge these out of AC to DC converters. (shown in the third picture)
1 Arduino development board (I used a duemilinove, but an Uno, diecimila, NG, etc. will work.)
1 robot base. (Go to step 2 for more info if you don't already have one)
1 Arduino supply battery pack (usually 9 volt batteries.)
1 Motor supply battery (2-4 AA batteries work well.)