A gas alarm, as the smoke approaches the sound gets louder and the color of the LED changes, green(quiet), yellow(warning) and red(danger). Made in arduino.
ATTENTION: the sound is very sharp and loud
Demo video: https://github.com/CaioScura/alarme_gas_Arduino/assets/86533634/0164313d-6556-4b00-8764-1139917d3181