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Author Topic: Did I kill it? Unexplained Voltage on Pin out.  (Read 538 times)
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Hi,
 
 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
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Post your code, lets see what you're working with.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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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); 

}
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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.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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