Unlike photodiodes and photovoltaic cells that have only two leads, a phototransistor's base connection allows a feedback circuit to control the device's bias point. Diverting current from the base ...

The first of the phototransistors points to the front of teh robot. Two additional phototransistor circuits were added, pointing left and right, so light can be sensed from any direction without the ...

By comparison, you can't get a LittleBits kit for less than $100, and the LittleBits Arduino Bit alone costs $39.95. The Snapino kit is clearly meant to be combined with other Snap Circuits kits.

Olympia Circuits Teases Arduino Programmers With $60 Arno Shield by Ray Willington — Monday, April 29, 2013, 05:50 PM EDT Comments ...