Ultrasonic sensor HC-SR-04 module Distance Sensor

The ultrasonic sensor can be used to measure distance and to detect obstacles. It has a transmitter and a receiver. The transmitter emits 40khz square waves automatically and detects it when it hits an obstacle to measure distance and to detect obstacles. The following are some of its features:

Features:

• Module is very precise achieving accuracies of 2cm and above.
• Distance measured ranges from 2cm-450cm.
• This module can be used with different families of microcontrollers including arduino, STM32, C51 etc.
• Module emits 40Khz Square waves and automatically detects them.
• Maximum working voltage is 5V.