![]() ![]() We will use the Adafruit DHT Python library to interface our DHT22 sensor to the Raspberry Pi, and the RPi.GPIO library to trigger the buzzer. We only need two Python libraries for this project. How to Setup an Active Buzzer on the Raspberry Piįor our first example, we will use an active buzzer as a sound alert when the reading from a DHT22 sensor goes above a certain temperature.īuild the circuit following the wiring diagram below: ![]() Active buzzers are best for simple sound generation for alerts and alarms – devices that only produce noise, not music. ![]() Passive buzzers are best when your project requires precise tone and volume control. You need a pulsating AC signal to generate a stable tone. On the other hand, passive buzzers don’t have internal oscillators. This means you only need DC voltage to create a stable sound. Active Buzzers vs Passive BuzzersĪn active buzzer uses an internal oscillator to generate a tone. Then we will build a project with a passive buzzer to play a musical tune. We will build an example project with an active buzzer that is activated when the reading from a DHT22 humidity and temperature sensor goes above a certain temperature. ![]()
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