Arduino Nano digitalWrite just 2.5V output:-(

I build up my own pcb board and are testing it. Anything is going right, but.. the digital Pins 2-7 are too low. I messured just 2.5V on digitalWrite(Pins, HIGH). I am using an Ardunio Nano with Atmega326.
Any solution for that? Right now I just put the Arduino in my bread board with nothing than just LEDs on the digital pins. And LEDs from 2-7 are darker than the one on pin8 ?????

are you using resistors with your led's, if not you may be burning out pins

Are the pins configured as OUTPUT?

Be sure to declare the pins as OUTPUT, as coding badly said. Otherwise you're just seeing the voltage from the pullup resistor.

Yes! Thats what I found too! Don't declare Pins to Input when there are Output and don't forget to do it at all:-)) Then it is going. Thanks all ya!
:smiley: