HC-SR04 Ultrasonic Sensor

Description

The HC-SR04 is a popular ultrasonic distance sensor used for obstacle detection and distance measurement in robotics and automation systems. It emits ultrasonic waves and measures the time taken for the echo to return, providing accurate distance data via digital signals.

Specs

Specification	Value
Operating Voltage	5V DC
Measuring Range	2cm – 400cm
Accuracy	±3mm
Measuring Angle	15°
Trigger Input Signal	10µs TTL pulse
Echo Output Signal	TTL level pulse
Dimensions	45mm × 20mm × 15mm

Compatibility

• Arduino Uno, Nano, Mega
• ESP8266 / ESP32
• Raspberry Pi (with GPIO + Python)
• Pico and other GPIO-capable boards

Resources

• 📘 Arduino Ultrasonic Tutorial
  Beginner's Guide
• 💡 HC-SR04 with Raspberry Pi
  Raspberry Pi Tutorial
• 🔧 HC-SR04 Timing Diagram
  Datasheet PDF

Description
The HC-SR04 Ultrasonic Module measures distances from 2 cm to 500 cm using a 40kHz sound pulse and echo detection method, with an effective detection angle of less than 15°. Powered by 5V and consuming under 2mA when idle, it’s ideal for robotics, obstacle avoidance, and ranging applications. Each module includes an ultrasonic transmitter, receiver, and control circuitry for accurate readings. This set includes 4 modules, suitable for use with Arduino, Raspberry Pi, and robot car platforms.

Specs
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Compatibility
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Resources
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