HC-SR04 Ultrasonic Distance Sensor Module

HC-SR04 Ultrasonic Distance Sensor Module (3.3V - 5V Compatible)

Description: The HC-SR04 is the most popular and reliable non-contact distance measuring sensor in the maker community. This upgraded version operates seamlessly on a wide voltage range (3.3V to 5V), making it entirely safe and plug-and-play for modern 3.3V microcontrollers like the ESP32 and ESP8266 without the need for external logic level shifters. By emitting an ultrasonic high-frequency pulse and measuring the time it takes for the echo to return, it calculates distances with impressive accuracy. Whether you are building an autonomous robot or a smart liquid-level monitor, the HC-SR04 provides excellent performance at an unbeatable value.

Key Specifications:

1. Operating Voltage: 3.3V to 5V DC
2. Measurement Range: 2cm to 400cm (0.8 inches to 13 feet)
3. Measuring Angle: < 15 degrees
4. Accuracy: ±3mm
5. Ultrasonic Frequency: 40 kHz
6. Pin Count: 4 Pins (VCC, Trig, Echo, GND)

Features:

1. Wide Voltage Compatibility: Works flawlessly with both standard 5V logic (Arduino Uno) and 3.3V logic (ESP32, ESP8266, Raspberry Pi).
2. High Precision: Delivers stable, high-resolution distance readings unaffected by sunlight or the color of the target object.
3. Non-Contact Measurement: Measures distances physically without touching the target, ensuring no wear and tear over time.
4. Maker-Friendly Integration: Breadboard-friendly pins and massive open-source library support make coding incredibly straightforward.

Common Applications:

1. Obstacle avoidance systems for DIY robotic cars (pairs perfectly with L298 motor drivers).
2. Non-contact liquid level monitoring for water tanks and smart agriculture.
3. Smart trash cans that open automatically when a hand approaches.
4. Security and presence detection alarms for smart home setups.