The Gravity: URM09 Ultrasonic Ranging Sensor is a high-performance, non-contact sensor offering 1% accuracy over 2~500cm, utilizing a standard PH2.0-3P Gravity vertical interface. It is compatible with 3.3V/5V controllers, such as Arduino and Raspberry Pi, and features a single I/O port for both input and output. This sensor is compact, highly accurate, and easy to use, making it ideal for applications such as robot obstacle avoidance and car backing annunciators.

Overhead shot of Gravity: URM09 Ultrasonic Distance Sensor

Docs

Tech Specs

1. Example Code for Arduino-Ultrasonic Distance Measurement

This example is the ultrasonic distance measurement of the module. The mainboard outputs a high-level about tens of microseconds to trigger the sensor to start ranging. Then, the sensor will output a high-level pulse proportional to the ultrasonic flight time. The distance can be easily obtained after a simple calculation by detecting high-level time.

2. Example Code for micro:bit-Ultrasonic Distance Measurement

Use micro:bit and MakeCode to realize ultrasonic distance measurement with URM09 Ultrasonic Sensor(Gravity Trig).

Reference

Specification

Parameter	Value
Operating Voltage	3.3~5.5V DC
Max Instantaneous Working Current	<20mA
Operating Temperature Range	-10℃～＋70℃
Effective Ranging Range	2cm～500cm
Resolution	1cm
Accuracy	1%
Acoustic Frequency	40±2KHz
Ranging Frequency	25Hz Max
Dimension	47×22mm/1.85×0.87”

Measuring Angle

Pinout

Board Overview

Num	Label	Description
1	-	Ground
2	+	Power Input(3.3V-5.5V)
3	D	Digital IO(TRIG/ECHO multiplexing, internally pulled-down)

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