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Sonar:bit for micro:bit Ultrasonic Sensor Distance Measuring 3V/5V

We have ✅ 9 available of the EF-EF04089 in our Sydney warehouse. An extra 100 units will be available shortly.

Express post delivery (2-5 business days)

Sonar:bit is an ultrasonic module with 3-5V working voltage. It is available to be used to 3.3V or 5V micro-controller system. With only one 3-wire(GVS) cable, it can work properly. Compared to the normal 4-wire ultrasonic module, it has saved one IO port. The measurement range of sonar:bit is 4cm-400cm. It can output stable and accurate measurement data with ±1cm tolerance only. You can use this module to occasions like short-distance measurement, smart cars, robots, micro:bit and arduino teaching, etc..


Input voltage:3V~5V

Enable to drive micro:bit or arduino directly.

Standard 3-wire GVS connecotr, which occupies 1 IO port only.

 Definition of Pins

Introduction of Major Components


Transmitter is used to send ultrasonic signals.


Receiver is for collecting ultrasonic signals.


This is the master chip of sonar:bit.

Chip for Sending Signal

This chip is used to drive the transmitter to send out ultrasonic signals.

Chip for Receiving Signal

This chip is used to receive and process ultrasonic echo signals as well as give feedbacks to the master chip.

G-V-S Port

G-V-S port allows outer devices control.

Quick Start

Hardware Connection

Connect sonar:bit to P2 port on sensor:bit and connect micro:bit to your computer.

Once completed, you can see the picture below:


Click to open Makecode online editor.

Write your program to assign the returned value of P2 to variable distance and display it on micro:bit screen.

You can see the whole program from the link here


We can see the distance between sonar:bit and the object is displayed on micro:bit in real time. The unit is centimeter.



Product Name: Sonar:bit

SKU: EF04089

Input Voltage: DC 3~5V

Measurement Range: 4~400cm

Accuracy Tolerance: ±1cm

Size: 40.6mm x 51.06mm

Net Weight: 12g


Packing List

1 x Sonar:bit

1 x GVS Jumper Cable


Sonar:bit Guide

The Sonar:bit for micro:bit Ultrasonic Sensor Distance Measuring 3V/5V appears in the following collections:

SKU EF-EF04089