Description
HC-SR04 Ultrasonic Distance Sensor – The “Eyes” of Your Robot
Add spatial awareness to your projects with high-precision, non-contact distance measurement.
The HC-SR04 provides an easy way to measure distances between 2cm and 400cm with an accuracy of up to 3mm. It works by emitting an ultrasonic burst (40kHz) and measuring the time it takes for the echo to bounce off a surface and return to the sensor. It is the go-to sensor for obstacle avoidance, liquid level sensing, and motion detection.
🚀 Key Features:
Precision Sensing: High accuracy and stable readings that are not affected by sunlight or black material (though soft materials like cloth can be tricky).
Simple Interface: Uses only 2 digital pins (Trigger & Echo) to communicate with your microcontroller.
Wide Range: Detects objects from as close as 2cm up to 4 meters away.
Breadboard Friendly: Standard 4-pin header makes it easy to plug into breadboards or jumper wires.
🛠️ How It Works (The Math):
The sensor calculates distance based on the speed of sound (340 m/s).
📦 Popular Use Cases:
Obstacle Avoidance Robots: The classic “Smart Car” that turns when it gets too close to a wall.
Digital Measuring Tape: Create a handheld device that displays distance on an LCD.
Water Level Indicator: Measure the depth of water in a tank without touching the liquid.
Parking Sensors: Build a DIY garage parking assistant with LED indicators.
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