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FAQ › Sensors › ESP32 Ultrasonic HC-SR04

// ultrasonic · hc-sr04 · faq ESP32 Ultrasonic HC-SR04 Filed under: ESP32 · HC-SR04 · Updated August 2026 Cheapest distance sensor you can wire to an ESP32: one trigger pin, one echo pin, a pulse measured in microseconds. Here's the hookup, the 5V question, and the readings that make no sense.

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