Robotics Ultrasonic — Free Robotics Tutorial
Learn Robotics Ultrasonic in Robotics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Robotics Ultrasonic in Robotics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Robotics Ultrasonic in Robotics
Ultrasonic sensors emit high-frequency sound waves (40 kHz) and measure the time it takes for echoes to return. Distance = speed of sound × time / 2.
Range: typically 2 cm to 4 meters. Very reliable in open air but fails in foggy/dusty conditions. No moving parts — robust and long-lasting.
Most common module: HC-SR04 with 4 pins: VCC (5V), GND, TRIG (send pulse), ECHO (receive pulse).
Robotics Ultrasonic — Syntax
// HC-SR04 Ultrasonic const int trigPin = 4; const int echoPin = 3; digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); long duration = pulseIn(echoPin, HIGH); int distance = duration * 0.034 / 2; // cm
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