Did I kill it? Unexplained Voltage on Pin out.


I am running the Arduino Pro Mini with a modified blink code turning all pins HIGH and keeping them HIGH. The following is what I am getting with no connection,

When board is on: Vcc = 4.95v Pin 2 = 4.95v (HIGH) Pin 3 = 4.95v (HIGH) Pin 10 = 4.31v (HIGH) Pin 11 = 4.31v (HIGH) Pin 12 = 3.90v (HIGH)

When board is off,

GND to Vcc = 760 (ohm) GND to Pin 2 = 460k (ohm) GND to Pin 3 = 460k (ohm) GND to Pin 10 = 106 (ohm) GND to Pin 11 = 106 (ohm) GND to Pin 12 = 100 (ohm)

Does any one have a guess as to why this would be happening? I have tested many of the others too and they all (except 13 due to led) work fine. But I am rather confused what would cause pins 10, 11 and 12 to act funny. Any help would be greatly appreciated. (I should also mention that there is nothing attached to the arduino). Thanks Again, Dan

Post your code, lets see what you're working with.

This is the code and thanks in advanced :

// Pin 13 has an LED connected on most Arduino boards. // give it a name: int a = 10; int b = 11; int c = 12;

int d = 2; int e = 3; int f = 4;

// the setup routine runs once when you press reset: void setup() { // initialize the digital pin as an output. pinMode(a, OUTPUT); pinMode(b, OUTPUT); pinMode(c, OUTPUT); pinMode(d, OUTPUT); pinMode(e, OUTPUT); pinMode(f, OUTPUT); }

// the loop routine runs over and over again forever: void loop() { digitalWrite(a, HIGH); digitalWrite(b, HIGH); digitalWrite(c, HIGH); digitalWrite(d, HIGH); digitalWrite(e, HIGH); digitalWrite(f, HIGH);


That is pretty straightforward code and should make for good high's.

Does the uC feel hot when powered? That' usually a good sign that something has been damaged.