Nodemcu v3 connected in 2 pcf8574 with 8relays and push button

Projects Programming
19

#include <PCF8574.h>
#include <Wire.h>

PCF8574 pcf8574a(0x24);
PCF8574 pcf8574b(0x21);

// uncomment the applicable line if using Uno or ESP8266
#define intPin D3 // interrupt input Uno
//#define intPin D4 // interrupt input NodeMCU ESP8266

volatile bool buttonPressed = false; // button interrupt flag
byte buttonReg; // button read register

void setup() {

// initialize PCF8574 with an interrupt pin and set all outputs to '1' (Relays off)
Wire.begin();
pinMode(intPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(intPin), buttonISR, FALLING);
pcf8574a.begin(0xFF); // turn off all Relays

}

void loop() {

// if a button press was detected via interrupt, check if the button press
// occurred on one of the "toggle" control buttons and toggle the relay if so
if (buttonPressed) {
delay(50); // crude debounce
buttonReg = pcf8574b.read8();

// toggle a relay if button pressed
if (!bitRead(buttonReg, 0)) {
  pcf8574a.toggle(1);
}

// toggle a relay if button pressed
if (!bitRead(buttonReg, 1)) {
  pcf8574a.toggle(2);
}

}

// clear interrupt flag
buttonPressed = false;
}

// interrupt service routine
void buttonISR() {
buttonPressed = true;
}