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 ...

I would like to turn on my car's heated seats over a mobile/cellular network using my iPhone, and I'm trying to figure out the simplest path. I know very little beyond that goal, but I know that RF, ...

I have a 24v power supply i regulate down to 12v. To run a microprocessor and some relays.<BR><BR>I then use 24v to run some hefty pneumatic solenoids. Problem is when they are under load they give ...