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Posted by Anonymous on Sat 10th Aug 2013 17:27
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// Public Domain 2013
// by Viktor Criterion of SFAQT http://SuperFunAdventureQuestTime.com/

// An implementation of Asimov's three rules of roboitcs in Arduino/Wiring

//A robot may not injure a human being or, through inaction, allow a human being to come to harm.
const int humanHarmPin =  8;      // if this pin goes high the action would harm a human.
const int humanInDangerPin=9;      // if this pin goes high a human is in danger

//A robot must obey the orders given to it by human beings, except where such orders would conflict with the First Law.
const int humanOrderPin=10; // if this pin goes high a human gave an order

//A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
const int robotHarmPin=11; // if this pin goes high the action will harm self


// Variables
int humanPeril = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 1000;           // interval at which to blink (milliseconds)

void setup()
{
  // set the digital pin as output:
  pinMode(humanHarmPin    ,INPUT);//requires external 10k pull down.
  pinMode(humanInDangerPin,INPUT);//requires external 10k pull down.
  pinMode(humanOrderPin   ,INPUT);//requires external 10k pull down.
  pinMode(robotHarmPin    ,INPUT);//requires external 10k pull down.
}

void loop()
{
  int actionAllowed=LOW; // default state is robot is not allowed to act
  //check the state of the input pins.
  int humanOrder   =digitalRead(humanOrderPin);
  int humanInDanger=digitalRead(humanInDangerPin);
  int humanHarm    =digitalRead(humanHarmPin);
  int robotHarm    =digitalRead(robotHarmPin);


  if (humanOrder==HIGH)
  {
    if (humanHarm==LOW) actionAllowed=HIGH;
  }
  if (robotHarm==HIGH)
  {
    if (humanOrder==HIGH && humanHarm==LOW) actionAllowed=HIGH;
  }
  if (humanInDanger==HIGH)
  {
    if (humanHarm==LOW) actionAllowed=HIGH;
  }


  if (actionAllowed==HIGH) doAction();

}

void doAction()
{
  //code goes here
}