Using Arduino with PIC32 and ATtiny Atmel Chips - Arduino - page 184

// simplest check first: Did we get the right number of knocks?
int currentKnockCount = 0;
int secretKnockCount = 0;
int maxKnockInterval = 0; // We use this later to normalize the times.
for (i=0;i<MAX_KNOCKS;i++){
if (knockReadings[i] > 0){
currentKnockCount++;
}
if (secretCode[i] > 0){ // todo: precalculate this.
secretKnockCount++;
}
if (knockReadings[i] > maxKnockInterval){ // collect normalization data while we're looping.
maxKnockInterval = knockReadings[i];
}
}
// If we're recording a new knock, save the info and get out of here.
if (programButtonPressed==true){
for (i=0;i<MAX_KNOCKS;i++){ // normalize the times
secretCode[i]= map(knockReadings[i],0, maxKnockInterval, 0, 100);
}
// And flash the lights in the recorded pattern to let us know it's been programmed.
digitalWrite(greenLED, LOW);
digitalWrite(redLED, LOW);
delay(1000);
digitalWrite(greenLED, HIGH);
digitalWrite(redLED, HIGH);
delay(50);
for (i = 0; i < MAX_KNOCKS ; i++){
digitalWrite(greenLED, LOW);
digitalWrite(redLED, LOW);
// only turn it on if there's a delay
if (secretCode[i] > 0){
delay( map(secretCode[i],0, 100, 0, maxKnockInterval));
// Expand the time back out to what it was, roughly.
digitalWrite(greenLED, HIGH);
digitalWrite(redLED, HIGH);
}
delay(50);
}
return false; // We don't unlock the door when we are recording a new knock.
}
if (currentKnockCount != secretKnockCount){
return false;
}