This dead silence just occur when i disconnecting I/O pin of the module. I used Arduino Ground for module GND-PIN, BUT this noise can be sensed via USB powering. I used a wall adapter 5v, but i connected module VCC to arduino vcc for a 3.3v how ever this module is compatible with both 3.3 and 5 volts. While negative terminal at GND through breadboard as shown in the wiring diagram. there is a short 'CHICK' like sound when i use digitalWrite( #pin, HIGH) which ended very fast. For this tutorial, I have connected the + terminal with PWM pin 10. This buzzer uses DC voltage as input and analogWrite just charge its transistor to acting like a switch. With a transducer analogWrite(128) will give you a square wave for the loudest sound.Īttached an amplified record of this noise (recorded by phone). Normally, you'd use tone() with a transducer and digitalWrite() with a buzzer. And, you should get 'dead silence' with the input grounded.īTW - Is there a reason you're using analogWrite()? That can 'work', but the default PWM frequency is a little low for a piezo. Noise wouldn't be unusual with a normal-linear amplifier, but the transistor won't switch-on until you get nearly 1/2 of a volt and that would be a LOT of noise. If you can try running if off a battery that can tell you if the noise is coming from the power supply. What are you using for a power supply? i.e. If it makes a tone/buzz (not just background noise) with digitalWrite() it's a buzzer.

A transducer/speaker is driven by an AC audio signal. Is that a 'buzzer' or a 'transducer'? A buzzer makes noise when you apply DC.

What does the (unwanted) noise sound like? Is it similar to what you're hearing with analogWrite()? Or higher/lower pitch, or hiss or crackle, etc?Īre you sure the noise is coming from the piezo speaker? Between the resistor and the piezo, run a. This will keep the current on a transition from exceeding the limits of the Arduino pin. Put a 100 ohm resistor between the pin and the piezo. But there are some things you can do to make sure you are safe when driving a mystery load. Is the buzzer ground connected to the Arduino ground? I think it is safe to drive a piezo speaker directly from a pin.

Arduino piezo speaker wiring pwm pin