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How to connect multiple HC-SR04 sensors with PCF8574 (3 methods with Arduino and ESP32)

The PCF8574 I/O expander adds 8 digital pins using only the two-wire I2C bus (SDA and SCL), letting you drive up to 4 HC-SR04 ultrasonic sensors from a single chip. This guide covers the wiring diagrams for ESP32 and Arduino UNO, the I2C addresses, complete code with ping_cm_poll(), median filtering for stable readings, the pulseIn/pulseInPoll primitives and how to pick the right polling interval without saturating the bus.

Sensore a ultrasuoni HC-SR04 con ESP32 e Arduino: guida completa

Scopri come usare il sensore a ultrasuoni HC-SR04 con Arduino, ESP32 ed ESP8266. Impara il principio del tempo di volo, i collegamenti sicuri e l'adattamento di livello, esempi pratici con pulseIn() e NewPing, oltre alle modalità avanzate per misurazioni affidabili con più sensori.

HC-SR04 Ultrasonic Sensor with ESP32 and Arduino: Complete Guide

Discover how to use the HC-SR04 ultrasonic sensor with Arduino, ESP32, and ESP8266. Learn its time-of-flight principle, safe wiring and voltage-level considerations, practical code with pulseIn() and NewPing, plus advanced multi-sensor modes for reliable distance measurement.

32 discussions collected since 2 September 2026. Track this forum by keyword →