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Arduino-Controlled Lock with Keypad

Difficulty Level = 6 [What’s this?] After tearing down an old CD player, I was inspired by the CD laser scanning assembly to build a door lock for my subterranean lab. The assembly has two motors: one for turning the CD (I’m not using this one) and one for...

Wireless Temperature Sensor

Difficulty Level = 5 [What’s this?] UPDATE: I have re-done this project using simple 434MHz RF transmitter/receiver devices. Check out the new project!. UPDATE: Also see this project for an easy way to display a temperature reading: Digit Shield Temperature...