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Using two PCF8574s for DI and DO

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Using two PCF8574s for DI and DO
mafckz Offline
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#1
06-25-2023, 12:23 PM
How to use two PCF8574s for DI and DO both?

Next program works correctly when I use only one PCF8574 (adress: 0x22; I2C pins: 4,15) that controls DI inputs on the board:
1.png
   

But it doesn't work when I uncomment code in red frames, trying to add another PCF8574 (adress: 0x24; I2C pins: 4,15) that controls DO outputs on the board.
2.png
   



Correct code for using digital input PCF8574 without errors   "1.png"
Code:
// Library: PCF8574_Library by RENZO MISCHIANTI
// https://mischianti.org/2019/01/02/pcf8574-i2c-digital-i-o-expander-fast-easy-usage/


#include "Arduino.h"
#include "PCF8574.h"

// Set i2c address
PCF8574 pcf8574i(0x22,4,15);
// PCF8574 pcf8574(0x24,4,15);

unsigned long timelapsed;

void setup()
{
    Serial.begin(115200);
    delay(1000);

    pcf8574i.pinMode(0, INPUT);
    pcf8574i.pinMode(1, INPUT);

  // pcf8574.pinMode(0, OUTPUT);
  // pcf8574.pinMode(1, OUTPUT);
  // sleep(100);
  // pcf8574.digitalWrite(0, LOW);
  // pcf8574.digitalWrite(1, LOW);

  delay(2000);
    Serial.print("Init pcf8574i...");
    if (pcf8574i.begin()){
        Serial.println("OK");
    }else{
        Serial.println("KO");
    }
  // Serial.print("Init pcf8574...");
  //   if (pcf8574.begin()){
  //       Serial.println("OK");
  //   }else{
  //       Serial.println("KO");
  //   }
}

void loop()
{
    uint8_t val1 = pcf8574i.digitalRead(0);
    uint8_t val2 = pcf8574i.digitalRead(1);

    if (val1==LOW) Serial.println("KEY1 PRESSED");
    if (val2==LOW) Serial.println("KEY2 PRESSED");

  // if (val1==LOW) {
  //   Serial.println("KEY1 PRESSED");
  //   // pcf8574.digitalWrite(0, HIGH);
  // }
    // if (val2==LOW) {
  //   Serial.println("KEY2 PRESSED");
  //   // pcf8574.digitalWrite(1, HIGH);
  // }


  delay(100);
  // Serial.println("--");
}
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admin Offline
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#2
06-25-2023, 12:42 PM
this is arduino source code for demo with KC868-A8 board, use INPUT and OUTPUT by PCF8574 at the same time. you can check.
Code:
#include <ETH.h>
#include <WiFiUdp.h>
#include <DS18B20.h>
DS18B20 ds1(14);  //channel-1-DS18b20
DS18B20 ds2(13);  //channel-2-DS18b20

DS18B20 ds3(32);  //channel-3-DS18b20
DS18B20 ds4(33);  //channel-4-DS18b20

#include "Arduino.h"
#include "PCF8574.h"

#include <RCSwitch.h>
RCSwitch mySwitch = RCSwitch();

#define ANALOG_A1   34
#define ANALOG_A2   35

// Set i2c address
PCF8574 pcf8574o(0x24);
PCF8574 pcf8574i(0x22);

#define ETH_ADDR        0
#define ETH_POWER_PIN  -1
#define ETH_MDC_PIN    23
#define ETH_MDIO_PIN   18
#define ETH_TYPE       ETH_PHY_LAN8720
#define ETH_CLK_MODE   ETH_CLOCK_GPIO17_OUT

#define s2 0

WiFiUDP Udp;                     
unsigned int localUdpPort = 4196; // local port
IPAddress local_ip(192, 168, 1, 200);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns(192, 168, 1,1);

void setup()
{
  mySwitch.enableReceive(digitalPinToInterrupt(15));
 
  Serial.begin(115200);
  Serial.println();

  pinMode(s2,INPUT);

  // Set pinMode to OUTPUT
  pcf8574o.pinMode(P0, OUTPUT);
  pcf8574o.pinMode(P1, OUTPUT);
  pcf8574o.pinMode(P2, OUTPUT);
  pcf8574o.pinMode(P3, OUTPUT);
  pcf8574o.pinMode(P4, OUTPUT);
  pcf8574o.pinMode(P5, OUTPUT);
  pcf8574o.pinMode(P6, OUTPUT);
  pcf8574o.pinMode(P7, OUTPUT);

  Serial.print("Init pcf8574o...");
  if (pcf8574o.begin()){
    Serial.println("OK");
  }else{
    Serial.println("KO");
  }
 


pcf8574i.pinMode(P0, INPUT);
pcf8574i.pinMode(P1, INPUT);
pcf8574i.pinMode(P2, INPUT);
pcf8574i.pinMode(P3, INPUT);
pcf8574i.pinMode(P4, INPUT);
pcf8574i.pinMode(P5, INPUT);
pcf8574i.pinMode(P6, INPUT);
pcf8574i.pinMode(P7, INPUT);

  Serial.print("Init pcf8574i...");
  if (pcf8574i.begin()){
    Serial.println("OK");
  }else{
    Serial.println("KO");
  }


  Serial.print("Temperature1:");
  Serial.print(ds1.getTempC());
  Serial.print(" C /\n");

  Serial.print("Temperature2:");
  Serial.print(ds2.getTempC());
  Serial.print(" C /\n");

  Serial.print("Temperature3:");
  Serial.print(ds3.getTempC());
  Serial.print(" C /\n");

  Serial.print("Temperature4:");
  Serial.print(ds4.getTempC());
  Serial.print(" C \n");

pcf8574o.digitalWrite(P0, HIGH);
pcf8574o.digitalWrite(P1, HIGH);
pcf8574o.digitalWrite(P2, HIGH);
pcf8574o.digitalWrite(P3, HIGH);
pcf8574o.digitalWrite(P4, HIGH);
pcf8574o.digitalWrite(P5, HIGH);
pcf8574o.digitalWrite(P6, HIGH);
pcf8574o.digitalWrite(P7, HIGH);

/*
  pcf8574o.digitalWrite(P0, LOW);
  delay(300);
  pcf8574o.digitalWrite(P1, LOW);
  delay(300);
  pcf8574o.digitalWrite(P2, LOW);
  delay(300);
  pcf8574o.digitalWrite(P3, LOW);
  delay(300);
  pcf8574o.digitalWrite(P4, LOW);
  delay(300);
  pcf8574o.digitalWrite(P5, LOW);
  delay(300);
  pcf8574o.digitalWrite(P6, LOW);
  delay(300);
  pcf8574o.digitalWrite(P7, LOW); */

   
  ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); //Enable ETH

  //传入参数静态IP地址,网关.DNS1,和2
  if (ETH.config(local_ip, gateway, subnet, dns, dns) == false) {
    Serial.println("LAN8720 Configuration failed.");
  }else{Serial.println("LAN8720 Configuration success.");}
 
/* while(!((uint32_t)ETH.localIP())) //等待获取到IP
  {

  }*/
  Serial.println("Connected");
  Serial.print("IP Address:");
  Serial.println(ETH.localIP());

  Udp.begin(localUdpPort); //启用UDP监听以接收数据
}

void loop()
{
uint8_t val1 = pcf8574i.digitalRead(P0);
uint8_t val2 = pcf8574i.digitalRead(P1);
uint8_t val3 = pcf8574i.digitalRead(P2);
uint8_t val4 = pcf8574i.digitalRead(P3);
uint8_t val5 = pcf8574i.digitalRead(P4);
uint8_t val6 = pcf8574i.digitalRead(P5);
uint8_t val7 = pcf8574i.digitalRead(P6);
uint8_t val8 = pcf8574i.digitalRead(P7);
uint8_t val_s2 = digitalRead(s2);


 
  int packetSize = Udp.parsePacket(); //获取当前队首数据包长度
  if (packetSize)                     //如果有数据可用
  {
    char buf[packetSize];
    Udp.read(buf, packetSize); //读取当前包数据

    Serial.println();
    Serial.print("Received: ");
    Serial.println(buf);
    Serial.print("From IP: ");
    Serial.println(Udp.remoteIP());
    Serial.print("From Port: ");
    Serial.println(Udp.remotePort());

    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //准备发送数据
    Udp.print("Received: ");    //复制数据到发送缓存
    Udp.write((const uint8_t*)buf, packetSize); //复制数据到发送缓存
    Udp.endPacket();            //发送数据
  }


//------------------------------------
if (val1==LOW) pcf8574o.digitalWrite(P0, LOW); else pcf8574o.digitalWrite(P0, HIGH);
if (val2==LOW) pcf8574o.digitalWrite(P1, LOW); else pcf8574o.digitalWrite(P1, HIGH);
if (val3==LOW) pcf8574o.digitalWrite(P2, LOW); else pcf8574o.digitalWrite(P2, HIGH);
if (val4==LOW) pcf8574o.digitalWrite(P3, LOW); else pcf8574o.digitalWrite(P3, HIGH);
if (val5==LOW) pcf8574o.digitalWrite(P4, LOW); else pcf8574o.digitalWrite(P4, HIGH);
if (val6==LOW) pcf8574o.digitalWrite(P5, LOW); else pcf8574o.digitalWrite(P5, HIGH);
if (val7==LOW) pcf8574o.digitalWrite(P6, LOW); else pcf8574o.digitalWrite(P6, HIGH);
if (val8==LOW) pcf8574o.digitalWrite(P7, LOW); else pcf8574o.digitalWrite(P7, HIGH);
if (val_s2==LOW)
   {
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //准备发送数据
    Udp.printf("Temperature1= %f C Temperature2= %f C Temperature3= %f C Temperature4= %f C\n",ds1.getTempC(),ds2.getTempC(),ds3.getTempC(),ds4.getTempC());   
    Udp.endPacket(); 
   }
//-------------------------------------
  if (mySwitch.available()) {

    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //准备发送数据
   
    Serial.print("Received ");
    Serial.print( mySwitch.getReceivedValue() );
    Udp.printf("Received %d\n",mySwitch.getReceivedValue()); 
    Serial.print(" / ");
    Serial.print( mySwitch.getReceivedBitlength() );
    Serial.print("bit ");
    Udp.printf("%d bit\n",mySwitch.getReceivedBitlength()); 
    Serial.print("Protocol: ");
    Serial.println( mySwitch.getReceivedProtocol() );
    Udp.printf("Protocol:%d",mySwitch.getReceivedProtocol());
   
    Udp.endPacket();            //发送数据
    mySwitch.resetAvailable();
  }
//-------------------------------------
  if (analogRead(ANALOG_A1)>0)
  {
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //准备发送数据
    Udp.printf("Current Reading A1 on Pin(%d)=%d\n",ANALOG_A1,analogRead(ANALOG_A1));    //复制数据到发送缓存
   // Udp.write((const uint8_t*)buf, packetSize); //复制数据到发送缓存
    Udp.endPacket();            //发送数据
   
    Serial.printf("Current Reading A1 on Pin(%d)=%d\n",ANALOG_A1,analogRead(ANALOG_A1));
  }
  if (analogRead(ANALOG_A2)>0)
  {
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort()); //准备发送数据
    Udp.printf("Current Reading A2 on Pin(%d)=%d\n",ANALOG_A2,analogRead(ANALOG_A2));    //复制数据到发送缓存
   // Udp.write((const uint8_t*)buf, packetSize); //复制数据到发送缓存
    Udp.endPacket();            //发送数据
   
    Serial.printf("Current Reading A2 on Pin(%d)=%d\n",ANALOG_A2,analogRead(ANALOG_A2));
  }
  delay(30);
 
}

.zip   A8-test.zip (Size: 1.88 KB / Downloads: 165)
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