ESP32 Forum

Hi .I am using PCA9536_I2CR_R11 I2C Mini relay Module available from ControlEverything.com to connect to esp32 using I2C communication but no device is detcted by esp32.



// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// PCA9536_R11
// This code is designed to work with the PCA9536_I2CR_R11 I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/products

#include<Wire.h>

// PCA9536_R11 I2C address is 0x41(65)
#define Addr 0x41

void setup()
{
// Initialise I2C communication
Wire.begin();
// Initialise Serial Communication, set baud rate = 9600
Serial.begin(9600);

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select configuration register
Wire.write(0x03);
// Set all pins as OUTPUT
Wire.write(0x00);
// Stop I2C transmission
Wire.endTransmission();
delay(300);
}

void loop()
{
// Start I2C transmission
Wire.beginTransmission(Addr);
// Select output port register
Wire.write(0x01);
// Set pin-1 as HIGH
Wire.write(0x01);
// Stop I2C transmission
Wire.endTransmission();
delay(1000);

// Output data to serial monitor
Serial.println("Pin-1 state is : HIGH");

Wire.beginTransmission(Addr);
// Select output port register
Wire.write(0x01);
// Set pin-1 as LOW
Wire.write(0x00);
// Stop I2C transmission
Wire.endTransmission();
delay(1000);

// Output data to serial monitor
Serial.println("Pin-1 state is : LOW");
delay(500);
}