In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...
The goal of the project is to create more I/O pins by adding another ATmega168/328 on top of an Arduino. This Arduino shield can provide an extra complete set of I/O pins to use for a total of 40 ...
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