Definition: Alarm Buzzer
The alarm buzzer is a piezoelectric audio signalling device which converts electrical signals into audible sounds. This piezoelectric buzzer is powered using a 5-Volt DC electrical output from the Nano Board Microcontroller. The frequency of the electrical signal supplied to the buzzer will determine the frequency of the sound emitted from the buzzer. A higher frequency electrical signal will result in a higher pitch sound coming from the buzzer, and vice versa for lower frequency electrical signals. This means that the user can program a microcontroller to output electrical signals which vary in frequency to create a musical tone with the piezoelectric buzzer.