The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object – just like bats or dolphins do. This module offers excellent range accuracy and stable readings in an easy-to-use package. It operation is not affected by sunlight or black material (although acoustically soft materials like cloth can be difficult to detect). Similar in Read more about Ultrasonic HC-SR04 DISTANCE Measuring module TRANSDUCER SENSOR for ARDUINO, AVR[…]