PCF8575 Ports Expansion Module

[byteman59]

Is anyone familiar on how to code for a PCF8575 Expansion ports module in arduino mega?

 

thanks

[Zero-One]

Hi byteman59,

Go to Libraries -> Library Manger and install PCF8575 by Rob Tillaart.

Then google "arduino PCF8575 Rob Tillaart" to find the Arduino & github sites. 

Scroll down on the github site and you'll see the documentation.

Also, look through the examples folders for code examples.

It's fairly easy to read and write all 16 bits and save them to a uint16_t variable.

When you get more experienced, you can read/write individual ports.

Some key items:

#include <PCF8575.h>

// Set address for I2C device
PCF8575 PCF(0x20);  // set I2C address as appropriate. PCF is your own unique device name.

Hex 20 is often the default, but you can add more devices to your I2C bus if you set the links on the PCB to give another unique address.

Check if you can find the device and print some debug output:

// Initialise I2C I/O expander
  if (!PCF.begin())
  {
    Serial.println("could not initialize...");
  } else {
    Serial.println("Initialised!");  
  }
// Test is I2C chip is connected
  if (!PCF.isConnected())
  {
    Serial.println("=> not connected");
  } else {
    Serial.println("=> connected!!");
  }

Read it to a 16 bit variable called 'x'

uint16_t x = PCF.read16();

Code snippets above are from others on the Web - credit to their collective Authors. 

Good luck

Zero-One.

[byteman59]

thank you so much! I will give it a try.

 

[byteman59]

ok, got it connected properly.

 

//
//    FILE: PCF8575_isConnected.ino
//  AUTHOR: Rob Tillaart
//    DATE: 2021-01-03
// PUPROSE: demo device detection

#include "PCF8575.h"

// adjust addresses if needed
PCF8575 PCF(0x20);

void setup()
{
 Serial.begin(115200);

// Initialise I2C I/O expander
  if (!PCF.begin())
  {
    Serial.println("could not initialize...");
  } else {
    Serial.println("Initialised!");  
  }
// Test is I2C chip is connected
  if (!PCF.isConnected())
  {
    Serial.println("=> not connected");
  } else {
    Serial.println("=> connected!!");
  }

 
}

void loop()
{
}

// -- END OF FILE --

How would i include the DCS-BIOS commands into this sketch?

 

For example, for the "DcsBios::Switch2Pos gearLever("GEAR_LEVER", PIN);"

 

Thanks