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Raspberry Make Buzzer Sing the Use of Function

Buzzer


A buzzer is a common sound device, and is often used as a sound generator in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products. They can be divided into either passive or active buzzers.

The “source" here does not refer to power source but instead the source of the oscillation.

The oscillation source is the oscillation circuit, which can convert the input DC signal into a physical oscillation which drives the buzzer to sound.The active buzzer has a built-in oscillation source, which can work by providing a constant DC voltage when it is in use. Its sound frequency is determined by the internal oscillation circuit, and its tone generally cannot be changed.

The passive buzzer has no oscillation source, and can only rely on the external input PWM (square wave) signal to achieve the alternating magnetic field. So, we can use the PWM signal to drive the vibration device to make the buzzer sound. By adjusting the frequency and duty cycle of the PWM signal, we can control the tone and volume of the buzzer.

The passive buzzer has no oscillation source, and can only rely on the external input PWM (square wave) signal to achieve the alternating magnetic field. So, we can use the PWM signal to drive the vibration device to make the buzzer sound. By adjusting the frequency and duty cycle of the PWM signal, we can control the tone and volume of the buzzer.

In this lesson, we will use the buzzer to play simple music. But before we start, we will learn how to reduce our workload by defining functions.


Conclusion

In this page (written and validated by ) you learned about Raspberry Make Buzzer Sing the Use of Function . What's Next? If you are interested in completing Raspberry tutorial, your next topic will be learning about: Raspberry Define Function.



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