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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("--");
}
Posts: 6,622
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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);
}
A8-test.zip (Size: 1.88 KB / Downloads: 157)
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