Low pin voltage, weak leds

Other Hardware 3rd Party Boards
1

Hi guys,

I'am still new to arduino programming. I have got 4 Arduino Nano's (since 5 weeks) and all 4 of them have the same problem since two days!

For example....if I run a normal BLINK sketch, the LED (with 330Ohm resistor) lights up very weak.
When I power up the Arduino with the USB port, I get 5V on the "5V-Pin" and 3,3V on the "3V3" Pin....perfect.

But on any of the OUTPUT pins i just get ~2,7V. I have no clue why!?

If I change the power supply to a 9V battery (or anything else) the OUTPUT pin voltage doesn't increase.
I wasn't able to find anything helpful about this problem on the internet.

Thanks a lot for your help,
Regards storzi16

2

The voltage coming out of the output pins should be (for the purposes of this conversation) the same as the supply voltage that the actual microcontroller uses. If you have 5V on the 5V pin then the output pins should be able to output 5V.
If you are getting that behaviour when you try to run the Blink sketch, and you haven't make any changes to the Blink sketch, and you haven't got anything else hooked up to the Nano, then it is likely that you have dodgy Nanos. Where did you get them from?

3

Mm, dodgy Arduino's is a possibility. But I would put my money on a damaged Arduino (aka, OP pulled to much current at some time).

4

septillion:
Mm, dodgy Arduino's is a possibility. But I would put my money on a damaged Arduino (aka, OP pulled to much current at some time).

You're right, I should have said 'a hardware problem' rather than 'dodgy Nanos'.

5

(deleted)

6

That would mean (s)he managed to change blink.... But yeah, possible :slight_smile:

7

what nano (5V or 3.3V)? See IC type.
what blink rate you have (ie delay(xxx) at sketch)?
if you use only battery (9V, NO USB connection), what is measured (5, 3.3, out)?