HC-SR04 Ultrasonic Sensor
Projectcircuito teamSun Aug 26 2018

HC-SR04 is a low cost ultrasonic sensor for common range measuring needs. The sensor provides 2cm to 400cm of non-contact measurement functionality with accuracy up to 3mm.


  • Easy setup
  • Low-cost
  • Good accuracy (up to 3mm)
  • Wide range – 2-400 cm.


  • Wide beam
  • Mutual Interference
  • Low read rate due to the velocity of sound

HC-SR04 Circuits

How to wire HC-SR04 to Arduino Uno
How to Wire HC-SR04 to NodeMCU
How to wire HC-SR04 to Arduino Gemma