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These are the big, easy-to-use pins at the bottom of the Micro:bit. You can connect
them using jumper wires. The working of these pins are as follows:

n Pins 0, 1 and 2 are general-purpose input/output (GPIO) pins. They can act as
inputs to detect signals from sensors or buttons and as outputs to control devices
such as LEDs, buzzers or motors.

n The 3V pin provides power to external devices and can also power the Micro:bit

itself if it is not connected to a battery.

n The GND pin or ground pin, completes the electrical circuit and is essential when
connecting the Micro:bit to other components.

Small Pins (3 to 22)

The small pins on the Micro:bit, numbered 3 to 22, are used for advanced projects
that require more connections than the three large pins provide. Some of these pins

are already connected to the LED display and buttons (A and B), so they must be
used carefully to avoid interfering with these built-in components.

Ask AIRO

What happens if we connect an output device to the wrong pin of the micro:bit?

BUZZER

A buzzer is a small electronic device that produces sound when powered by
electricity. It is commonly used in alarms, timers and notifications to alert users
through beeps or tones.

Buzzers can be easily connected to microcontrollers like the Micro:bit to create

sound-based responses, making them useful for interactive projects.

Connecting a Buzzer with Micro:bit

In this project, you will learn how to connect a buzzer to the Micro:bit and make it
produce sound using MakeCode. You will connect the buzzer to the Micro:bit’s pins
and program it to play sound continuously. The buzzer acts as an output device,

converting the electrical signals from the Micro:bit into sound.

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