Arduino Ultrasonic Sensor HC-SR04 Hack for Smart Fans
Arduino ULTRASONIC Sensor HC-SR04 Hack for Smart Fans!
Arduino Uno | Measuring Distance with HC-SR04 Ultrasonic Sensor
Example Effect
Press the serial monitor, and you can see that the measured distance is 9.8cm-10.1cm with an error of about 0.2cm.
HC-SR04
An ultrasonic sensor used for distance measurement, widely applied in robotics to avoid obstacles and measure distances.
Its module uses Trig to trigger distance measurement,
which emits 8 40kHz square waves and