HC-SR04 Ultrasonic Sensor Distance Measuring Module

This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.

There are only four pins that you need to worry about on the HC-SR04: VCC (Power), Trig (Trigger), Echo (Receive), and GND (Ground). You will find this sensor very easy to set up and use for your next range-finding project!

Specifications

• Model: HC-SR04
• Color: Blue Silver
• Working voltage : 5V(DC)
• Static current: Less than 2mA.
• Output signal: Electric frequency signal, high level 5V, low level 0V.
• Sensor angle: Not more than 15 degrees.
• Detection distance: 2cm~450cm.
• High precision: Up to 3mm
• Mode of connection: VCC / trig(T) / echo(R) / GND
• Module Working Principle:
• Adopt IO trigger through supplying at least 10us sequence of high level signal
• The module automatically send eight 40khz square wave and automatically detect whether it receive the returning pulse signal

What's in the box?

1 x HC-SR04 distance sensor

You might need a bracket to mount this sensor

Resources

Follow this tutorial at ThePiHut.

https://thepihut.com/blogs/raspberry-pi-tutorials/hc-sr04-ultrasonic-range-sensor-on-the-raspberry-pi
Using GPIOZero