Detect a nearby object with HC-SR04 and drive a local indicator as a tabletop proximity demonstration, not a certified security system.
The prototype demonstrates vehicle detection and servo motion, but one range sensor and a fixed delay are not enough for a safe real barrier. Prototype…
Our earlier ultrasonic sensor article covered the HC-SR04's wiring and distance-calculation math with results printed to the Serial Monitor; this project…
A quick rundown of five essential sensors: ultrasonic, soil moisture, sound, MQ2 gas, and color recognition.
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