Realizing a simple switch on the wall ... by even the most rudimentary of sound-detection hardware. At the most basic level, all they needed was a way for an Arduino to throw a relay once the ...

To test the proof-of-concept, you just need to connect an Arduino to an MP3 player and play Tsao’s firmware audio file. Tsao says that he got interested in the project because he wants to ...

When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...