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 ...

Good stuff, Al. Thanks. I’m a big fan of ChibiOS. I recently decided I’d do a quick survey of all the RTOSes that will run on an arduino (328P at least) and I quickly settled on ChibiOS as the ...

The Arduino sketch is also setup to give “hints” to the player ... as a quick demonstration of how both the RFID “combination” and manual override can be used to trigger the attached relay.

The relay can be used to open a door lock and if you need a louder alarm then you can replace the small buzzer with a high power siren. I will not talk about the RFID reader because you can find a lot ...

Of all the Arduino projects we've seen 'round here, this is certainly one of them! Using nothing but a Graphics LCD, an Arduino, and a WebSocket server he wrote using Python / Tornado, ...