Voltage on pin12.

Using Arduino Project Guidance
1

I have an Arduino Mega 2560 is the voltage on the this pin 12 I perform the following:

void setup() {
// initialize the digital pin as an output.
// Pin 13 has an LED connected on most Arduino boards:
pinMode(12, OUTPUT);
}

void loop() {
digitalWrite(12, HIGH); // set the LED on
delay(1000); // wait for a second
digitalWrite(12, LOW); // set the LED off
delay(1000); // wait for a second
}

Regards.
James

2

Can you refrase the question?
It is not clear what you mean (at least to me)

3

Are the voltages on the PWM pins (13,12) at 5 volts on the Arduino Mega 2560?

4

Are the voltages on the PWM pins (13,12) at 5 volts on the Arduino Mega 2560?

All I/O pins are at (or near) VCC. Since the Mega 2560 is running 5V, the I/O pins will be 5V.

5

If the LED is across pin 12 & Gnd with no current limit resistor - while pin 13 has a series resistor with the LED - the output pin 12 may have been damaged, and no longer outputting 5V.