Arduino Uno low pitch humming sound

Other Hardware Audio
1

I have a circuit here using an Arduino Uno and a micro servo motor. I connected both to 2 individual usb cable which is then connected to a router (with proper ground connections and such) The router provides up to 5V/3A of power.

The circuit is basically an RTC telling the arduino to move the servo at 11AM, 5PM and 5AM. (I’ll edit to attach a circuit diagram in a bit)

The problem is that after a while being plugged in, the arduino starts making low pitched buzz/chirp sound. I can still hear it from a decent distance away and it’s driving me insane. I’m not sure if a component is damaged or if this is normal but I can’t identify the source of this sound.

Unfortunately you can’t attach videos with audio on here it seems

2

The Arduino 5V output is not designed to work with motors or servos, and the Arduino can be damaged if you try.

Power power the servo separately (a 4xAA battery pack is fine for 1 or 2 small servos), and the problem should go away. Don't forget to connect the grounds.

servo_pwr
servo_pwr1035×538 42.8 KB

3

Yeah the servo is not powered by the arduino it’s powered by the router as well

4

You will continue to have problems like this, until you have learned how to design and implement power supply decoupling, which requires advanced understanding of electronic circuit theory.

5

@ascelphotna / @thekoyo, I see you've created a sock puppet and cross-posted. Neither were a good choice.