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sensors
The HC-SR04 Ultrasonic Sensor is a low-cost distance-measuring module commonly used in Arduino, ESP32, Raspberry Pi, and other microcontroller projects. It measures the distance to an object by sending an ultrasonic sound pulse and calculating how long it takes for the echo to return. Key Features 📏 Distance Range: Approximately 2 cm to 400 cm 🎯 Accuracy: Around 3 mm 🔊 Operating Frequency: 40 kHz ultrasonic ⚡ Operating Voltage: 5V 🔌 Pins: VCC, Trig, Echo, GND 🤖 Applications: Obstacle avoidance, robotics, parking sensors, automatic doors, and distance measurement 💻 Compatible With: Arduino, ESP32, STM32, Raspberry Pi, and other microcontrollers How It Works The Trig pin receives a short trigger pulse, causing the sensor to emit an ultrasonic wave. When the wave hits an object, it reflects back to the Echo receiver. The sensor outputs the travel time, which the microcontroller converts into distance. Distance = (Time × Speed of Sound) ÷ 2 The division by 2 is necessary because
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