#include "Arduino.h" #include "PCF8574.h" PCF8574 pcf8574(0x20); void setup(){ Serial.begin(115200); pcf8574.pinMode(P2, OUTPUT); //trig pcf8574.pinMode(P3, INPUT); //echo pcf8574.begin(); } void loop(){ long duration, cm; pcf8574.digitalWrite(P2, LOW); delayMicroseconds(2); pcf8574.dig…

how to use multi Ultrasonic sensor (hc-sr04) with PCF8574 in ESP8266 (nodeMCU)

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