Ive read a lot on the topic some say it works, some say its pure fantasy. The Arduino Pro Mini used to control the traffic light is not only responsible for playing the tones. So, I would like to build a rats repellent circuit. sound was meticulously recreated in his Arduino code. I dont want to kill them, just keep them away. ![]() The loop() routine will make this run, again and again, making a short beeping sound. Hi folks, Ive got a bit problem with rats, they are destroying my garden. A piezo speaker uses the piezoelectric effect to generate sound. How does it work? It's simple, tone(buzzer, 1000) sends a 1KHz sound signal to pin 9, delay(1000) pause the program for one second and noTone(buzzer) stops the signal sound. If you Piezo still sounds a bit underwhelming you can try using a simple amplifier and a speaker for better quality sound - Adding Audio to Arduino Projects Sometimes a project just needs to be louder, whether its a synthesizer, alarm clock, autonomous robot or the RC Arduino lap timer. Arduino can produce a frequency output, as was done previously with the 555. For more interesting projects connect with me on: Youtube.
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