Documentation **[[Documentation|Home]]**
====== BASIC INFORMATION ======

Name: **I2C Digital IO Board**\\
Type: **Adpater Board**\\
Version: **1.0.0**\\
Author: **Dubravko Penezic**\\
Copyright: **Creative Commons BY-NC-SA v 3.0**\\
Implemented function:
  * **PCF8574(A) 8 input ports with or without pull-down resistor**
  * **PCF8574(A) 8 output ports with transistor controlled ground (GND)**
  * **2x RGB LED 5050 and 2 LED 0805 possible**
  * **Input/output pads available**
  * **Selective input or output mode for all 8 pins**
  * **connectivity for [[lcd_kyb|LCD & KYB V 1.0.0]] with option to put analogue line instead of INT line to connectivity bus**
  * **selectable I2C address**
  * **selectable pulling resistors for I2C bus**
\\ PCB Top image:\\
{{:de_twi_status_led_lcd_1_0_0:img_1602.png?|}}
\\ PCB Bottom image:\\
{{:de_twi_status_led_lcd_1_0_0:img_1600.png?|}}
\\ 
====== Implementation ======
==== Schematic ====
{{:de_twi_status_led_lcd_1_0_0:i2c_pcf8574.png?300|}} \\
{{:de_twi_status_led_lcd_1_0_0:i2c_io_selector.png?300|}} \\
{{:de_twi_status_led_lcd_1_0_0:i2c_leds.png?300|}}\\
==== Source example ====
<file ino LCD_Keypad_DL_V1_0_0.ino>
/*
Author: Dubravko Penezic

Version: 1.0, 2012

This code is example how to use DpI2CIOPCF8574 library.

Source code is provided as is, without any warranty.

Distributetd under CC BY v 3.0

http://pcb.daince.net/doku.php?id=arduino_code
*/

// Library contain Wire.h include, but you need to declare it once again
#include <Wire.h>

#include <DpI2CIOPCF8574.h>

// set the address to 0x20 - 0x27 for PCF8574
// set the address 0x38 - 0x3F for PCF8574A used on daince I/O Expansion
#define boardAddr 0x38

// initialize daince I/O Expansion

DpI2CIOPCF8574 io;

void setup(void) {
  Serial.begin(9600);
  Serial.println("DpI2CIOPCF8574 V 1.0");
  
  Wire.begin();
  io.begin(boardAddr);
// all pins are output high on begining  
  io.setOutputLow();

}

void loop(void) {
 
  for(int i = 0; i<8; i++){
   io.setOutputStatus();
   io.toggleOutputPin(i);
   delay(2000);
  }
}
</file>
\\
DpI2CIOPCF8574 library you may found [[arduino_code|here]]. \\