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