PinTest01

/*
    This can be used to test for cooked pins on an Arduino
    Change OUTPUT states then Change to INPUT and Write HIGH (pull-ups on) and then LOW (pull-ups off)
    Start with pin 2 and work up to pin 12 one at a time. We'll assume the other pins are fine.
    Verify the voltage on each pin with a DVM.
*/

int testPin=2; // Start with pin 2 and increment for each pin after running the four tests below.
int testNumber=0; // Start at 0 and increment to 3 on each pin set above.

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  switch(testNumber){
    case 0:
     pinMode(testPin,OUTPUT);
     digitalWrite(testPin,LOW);
     break;
    case 1:
     pinMode(testPin,OUTPUT);
     digitalWrite(testPin,HIGH);
     break;
    case 2:
     pinMode(testPin,INPUT);
     digitalWrite(testPin,HIGH);
     break;
    case 3:
     pinMode(testPin,INPUT);
     digitalWrite(testPin,LOW);
     break;
    default:
     pinMode(testPin,INPUT);
     digitalWrite(testPin,LOW);
     break;

  }
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}