Code 7: //The demo code is PCF8574-DO You can copy the code to your Arduino IDE.
Code:
#include "Arduino.h"
#include "PCF8574.h"
// Set i2c address
PCF8574 pcf8574_1(0x24,4,5);
PCF8574 pcf8574_2(0x25,4,5);
void setup()
{
Serial.begin(115200);
pcf8574_1.pinMode(P0, OUTPUT);
pcf8574_1.pinMode(P1, OUTPUT);
pcf8574_1.pinMode(P2, OUTPUT);
pcf8574_1.pinMode(P3, OUTPUT);
pcf8574_1.pinMode(P4, OUTPUT);
pcf8574_1.pinMode(P5, OUTPUT);
pcf8574_1.pinMode(P6, OUTPUT);
pcf8574_1.pinMode(P7, OUTPUT);
pcf8574_2.pinMode(P0, OUTPUT);
pcf8574_2.pinMode(P1, OUTPUT);
pcf8574_2.pinMode(P2, OUTPUT);
pcf8574_2.pinMode(P3, OUTPUT);
pcf8574_2.pinMode(P4, OUTPUT);
pcf8574_2.pinMode(P5, OUTPUT);
pcf8574_2.pinMode(P6, OUTPUT);
pcf8574_2.pinMode(P7, OUTPUT);
Serial.print("Init pcf8574_1...");
if (pcf8574_1.begin()){
Serial.println("PCF8574_1_OK");
}else{
Serial.println("PCF8574_1_KO");
}
Serial.print("Init pcf8574_2...");
if (pcf8574_2.begin()){
Serial.println("PCF8574_2_OK");
}else{
Serial.println("PCF8574_2_KO");
}
}
void loop()
{
pcf8574_1.digitalWrite(P7, LOW);
delay(1000);
pcf8574_1.digitalWrite(P7, HIGH);
delay(1000);
pcf8574_2.digitalWrite(P7, LOW);
delay(1000);
pcf8574_2.digitalWrite(P7, HIGH);
delay(1000);
}
Running this code, the relays are not able on/ off. Measure the voltage from opto coupler. they are just change from 3.3V to 2.1V (should be 0V). Please help.
maybe you have not connect dc12v with these "INPUT" terminal. take a photo how you wire cable.
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attachment=5342]
Sorry, I was wrong. the 1.2V is good for couplers. The question is now move to where are LO0 and LO1 come from? Measuring the pin#6 and pin#4 of couplers, the voltage is not change when couplers is on or off.
take a photo how you wire cable.
You're right. we didn't connect 12V to output terminals yet. And board is working now. thanks!!!!
I've got a16 board and downloaded latest arduino IDE with esp board support rev 3.0.5. The difference is that pinout is a bit modified e.g. SDA/SDL are 21 & 22 not 4 & 5. Should use older version e.g. rev. 2.0.16? Also there is no definition of P0..P7, I made modification od example code as follow to get it compiled:
Code:
#include "Arduino.h"
#include "Adafruit_PCF8574.h"
static const uint8_t P0 = 0;
static const uint8_t P1 = 1;
static const uint8_t P2 = 2;
static const uint8_t P3 = 3;
static const uint8_t P4 = 4;
static const uint8_t P5 = 5;
static const uint8_t P6 = 6;
static const uint8_t P7 = 7;
// Set i2c address
Adafruit_PCF8574 pcf8574_1;//(0x24,4,5);
Adafruit_PCF8574 pcf8574_2;//(0x25,4,5);
void setup()
{
Serial.begin(115200);
pcf8574_1.pinMode(P0, OUTPUT);
pcf8574_1.pinMode(P1, OUTPUT);
pcf8574_1.pinMode(P2, OUTPUT);
pcf8574_1.pinMode(P3, OUTPUT);
pcf8574_1.pinMode(P4, OUTPUT);
pcf8574_1.pinMode(P5, OUTPUT);
pcf8574_1.pinMode(P6, OUTPUT);
pcf8574_1.pinMode(P7, OUTPUT);
pcf8574_2.pinMode(P0, OUTPUT);
pcf8574_2.pinMode(P1, OUTPUT);
pcf8574_2.pinMode(P2, OUTPUT);
pcf8574_2.pinMode(P3, OUTPUT);
pcf8574_2.pinMode(P4, OUTPUT);
pcf8574_2.pinMode(P5, OUTPUT);
pcf8574_2.pinMode(P6, OUTPUT);
pcf8574_2.pinMode(P7, OUTPUT);
Wire.begin(21, 22);
Serial.print("Init pcf8574_1...");
if (pcf8574_1.begin(0x24, &Wire)){
Serial.println("PCF8574_1_OK");
}else{
Serial.println("PCF8574_1_KO");
}
Serial.print("Init pcf8574_2...");
if (pcf8574_2.begin(0x25, &Wire)){
Serial.println("PCF8574_2_OK");
}else{
Serial.println("PCF8574_2_KO");
}
}
void loop()
{
pcf8574_1.digitalWrite(P7, LOW);
delay(1000);
pcf8574_1.digitalWrite(P7, HIGH);
delay(1000);
pcf8574_2.digitalWrite(P7, LOW);
delay(1000);
pcf8574_2.digitalWrite(P7, HIGH);
delay(1000);
}
just do as our sample code's I2C bus pin define.
(11-07-2024, 11:52 AM)admin Wrote: [ -> ]just do as our sample code's I2C bus pin define.
I did set pint to 4/5 and modified your example to get it up and running, maybe someone else will re-use it as original code is not working - at lest for myself)
Code:
#include "Arduino.h"
#include "Adafruit_PCF8574.h"
static const uint8_t P0 = 0;
static const uint8_t P1 = 1;
static const uint8_t P2 = 2;
static const uint8_t P3 = 3;
static const uint8_t P4 = 4;
static const uint8_t P5 = 5;
static const uint8_t P6 = 6;
static const uint8_t P7 = 7;
static const uint8_t PIN_UART_RX = 3;
static const uint8_t PIN_UART_TX = 1;
static const uint8_t PIN_SDA = 4;
static const uint8_t PIN_SCL = 5;
// Set i2c address
Adafruit_PCF8574 pcf8574_1;//(0x24,4,5);
Adafruit_PCF8574 pcf8574_2;//(0x25,4,5);
TwoWire i2c = TwoWire(0);
void setup()
{
Serial.setPins(PIN_UART_RX, PIN_UART_TX);
Serial.begin(9600);
delay(1000);
i2c.begin(PIN_SDA, PIN_SCL);
Serial.print("Init pcf8574_1...");
if (pcf8574_1.begin(0x24, &i2c)){
Serial.println("PCF8574_1_OK\n");
}else{
Serial.println("PCF8574_1_KO");
}
Serial.print("Init pcf8574_2...");
if (pcf8574_2.begin(0x25, &i2c)){
Serial.println("PCF8574_2_OK");
}else{
Serial.println("PCF8574_2_KO");
}
pcf8574_1.pinMode(P0, OUTPUT);
pcf8574_1.pinMode(P1, OUTPUT);
pcf8574_1.pinMode(P2, OUTPUT);
pcf8574_1.pinMode(P3, OUTPUT);
pcf8574_1.pinMode(P4, OUTPUT);
pcf8574_1.pinMode(P5, OUTPUT);
pcf8574_1.pinMode(P6, OUTPUT);
pcf8574_1.pinMode(P7, OUTPUT);
pcf8574_2.pinMode(P0, OUTPUT);
pcf8574_2.pinMode(P1, OUTPUT);
pcf8574_2.pinMode(P2, OUTPUT);
pcf8574_2.pinMode(P3, OUTPUT);
pcf8574_2.pinMode(P4, OUTPUT);
pcf8574_2.pinMode(P5, OUTPUT);
pcf8574_2.pinMode(P6, OUTPUT);
pcf8574_2.pinMode(P7, OUTPUT);
}
void loop()
{
pcf8574_1.digitalWrite(P7, LOW);
delay(1000);
pcf8574_1.digitalWrite(P7, HIGH);
delay(1000);
pcf8574_2.digitalWrite(P7, LOW);
delay(1000);
pcf8574_2.digitalWrite(P7, HIGH);
delay(1000);
}