HC-SR04 measures distance from 2cm to 400cm using two ultrasonic transducers. Sensor emits 40,000 Hz ultrasound pulses and listens for reflected waves. Has 4 pins: VCC, GND, Trig, and Echo
HC-SR04 ultrasonic sensor measures distance using ultrasonic waves. Sensor has four pins: VCC, GND, TRIG, and ECHO. TRIG pin receives control signal from Arduino. ECHO pin sends pulse to Arduino
Second generation ultrasonic sensor operates between 3.3V and 5V DC. Measures distance using 40KHz ultrasonic pulses and echo return time. Features piezoelectric crystal sensor elements for high-frequency operation
Tutorial shows how to create a distance detector using Arduino and ultrasonic sensor. Project requires Arduino Uno, HC-SRO4 sensor, buzzer, and various LEDs
Project aims to measure distance between HC-SR04 sensor and object. Uses I2C LCD screen for displaying distance measurements
Mobile robot platform compatible with Raspberry Pi/Arduino. Supports line tracking, obstacle avoidance, and remote control. Uses L298P motor driver with diode protection. Operates on 7.4V power from two 18650 batteries