Use Mega Drive pad on PS3. Requires Unojoy (http://code.google.com/p/unojoy/) A = Circle B = Cross C = Square Start + Up = Home Button Start + Down = Select

Mega_Drive_PS3.ino

#include "UnoJoy.h"

int up = 2;
int down = 3;
int left = 4;
int right = 5;
int ab = 6;
int slct = 7; //setting this pin HIGH/LOW reads A/B and Start/C
int startc = 8;

void setup() {
  for (int i = 2; i <= 6; i += 1){
    pinMode(i, INPUT);
  } //pins 1-6 inputs
  pinMode(slct, OUTPUT); //'select' pin is an output
  pinMode(startc, INPUT);
  setupUnoJoy();
}

void loop() {
  dataForController_t controllerData = getControllerData();
  setControllerData(controllerData); //Unojoy loop taken from example sketch
}

dataForController_t getControllerData(void) {
  dataForController_t controllerData = getBlankDataForController();
  digitalWrite(slct, LOW); //set 'select' LOW to read A and Start
  controllerData.squareOn = !digitalRead(ab); //UJ data is inverse of pad data
  if (digitalRead(startc) == LOW && digitalRead(up) == LOW) { 
    controllerData.homeOn = HIGH; //Start and Up for Home button
  }
  else {
    controllerData.homeOn = LOW;
    controllerData.dpadUpOn = !digitalRead(up); 
    controllerData.startOn = !digitalRead(startc);  
  }
  if (digitalRead(startc) == LOW && digitalRead(down) == LOW) {
    controllerData.selectOn = HIGH; //Start and Down for Select Button
  }
  else {
    controllerData.selectOn = LOW;
    controllerData.dpadDownOn = !digitalRead(down); 
  }
  digitalWrite(slct, HIGH); //set 'select' HIGH to read B and C
  controllerData.dpadLeftOn = !digitalRead(left);
  controllerData.dpadRightOn = !digitalRead(right);
  controllerData.crossOn = !digitalRead(ab);
  controllerData.circleOn = !digitalRead(startc);
  return controllerData;
}