manage multi pcf574

[carlosprato1]

Hello, very good bookstore, I am grateful. I would like to know if I can handle two pcf8474 at the same time? if yes. Do you have any example of how to do it?

[carlosprato1]

recently testing I achieved it this way. excuse my little knowledge, thanks again.

`#include "Arduino.h"

include "Arduino.h"

include "PCF8574.h" // https://github.com/xreef/PCF8574_library

TwoWire I2Ctwo = TwoWire(1); TwoWire I2Ctwo0 = TwoWire(1);

PCF8574 pcf8574(&I2Ctwo, 0x27, 21, 22); PCF8574 pcf85740(&I2Ctwo, 0x26, 21, 22);

void setup() { Serial.begin(112560);

I2Ctwo.begin(21,22,400000); I2Ctwo0.begin(21,22,400000); delay(1000);

// Set pinMode to OUTPUT for(int i=0;i<8;i++) { pcf8574.pinMode(i, OUTPUT); pcf85740.pinMode(i, OUTPUT); }

Serial.print("Init pcf8574...");
if (pcf8574.begin()){
    Serial.println("OK");
}else{
    Serial.println("KO");
}

if (pcf85740.begin()){ Serial.println("OK 0"); }else{ Serial.println("KO 0"); } }

void loop() { static int pin = 0;

pcf8574.digitalWrite(pin, HIGH); pcf85740.digitalWrite(pin, HIGH); delay(1500); pcf8574.digitalWrite(pin, LOW); pcf85740.digitalWrite(pin, LOW); delay(1500);

pin++; if (pin > 7) pin = 0; }`

[xreef]

Hi Carlos, another similar issue on the forum. https://www.mischianti.org/forums/topic/more-than-one-pcf8574-expander/ Bye Renzo