3.1 - Beep

The active buzzer is a typical digital output device that is as easy to use as lighting up an LED!

Schematic

sch_buzzer

When the GP15 output is high, after the 1K current limiting resistor (to protect the transistor), the S8050 (NPN transistor) will conduct, so that the buzzer will sound.

The role of S8050 (NPN transistor) is to amplify the current and make the buzzer sound louder. In fact, you can also connect the buzzer directly to GP15, but you will find that the buzzer sound is smaller.

Wiring

Two types of buzzers are included in the kit. We need to use active buzzer. Turn them around, the sealed back (not the exposed PCB) is the one we want.

img_buzzer

The buzzer needs to use a transistor when working, here we use S8050 (NPN Transistor).

wiring_beep

Code

Note

  • You can open the file 3.1_beep.ino under the path of kepler-kit-main/arduino/3.1_beep.

  • Or copy this code into Arduino IDE.

  • For detailed tutorials, please refer to Open & Run Code Directly.

  • Or run this code directly in the Arduino Web Editor.

Don’t forget to select the Raspberry Pi Pico W board and the correct port before clicking the Upload button.

After the code runs, you will hear a beep every second.