I'm completely new to anything circuit-related. Got the arduino mega 2560, and tried using the blink example from the ide. It was uploaded successfully, but the pin13 LED just wont light up. Any help?
Are you taking about the on board led or one which you have connected to digital pin 13 ?
I'm talking about the onboard LED. The one connecting to pin13 works fine.
So you added a led to pin 13? How? Did you use a series resistor?
No... I thought pin 13 has an integrated resistor?
Download the schematic and you will see.
The pin has a resistor.
sheepie:
I'm talking about the onboard LED. The one connecting to pin13 works fine.
I am confused.
The yellow LED onboard LED on the Mega is connected to pin 13.
Are you saying that the green LED indicating +5V isn't lighting.
sheepie:
The pin has a resistor.
Pin 13 on the header does not have a resistor between pin and micro controller.
Show a schematic (photo/scan of a hand-drawn one is fine) and post the code that you use.
ieee488:
The yellow LED onboard LED on the Mega is connected to pin 13.
On an official Mega, it's indirectly connected; there is an opamp that buffers.
So look in device manager. Try another computer. If it doesn't appear in DM, you have a dead board.
sterretje:
Pin 13 on the header does not have a resistor between pin and micro controller.Show a schematic (photo/scan of a hand-drawn one is fine) and post the code that you use.
On an official Mega, it's indirectly connected; there is an opamp that buffers.
I am looking at the schematic here https://www.arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf?
I don't see the opamp. Am I looking at the wrong place in the circuit?
I am looking at PWMH connector on the schematic.
ieee488:
I am looking at the schematic here https://www.arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf?
That is an old revision.
This is the current one: https://www.arduino.cc/en/uploads/Main/arduino-mega2560_R3-sch.pdf
Thanks.
The OP may be looking at the old one just as I was. Oops.