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Topic: Digital I/O Pins Output (Read 461 times) previous topic - next topic

adolfhack

Dear all,
i got this situation:

Atmega328p circuit is built and tested.. and it works fine.
BUT, i noted that all digital pins output only 3.7V instead of 5V,
while analog pins output 5V as normal !
i tried to remove extra parts to test and figure out the problem, but still the same
now i only got the Atmega, Oscillator and a pullup resistor to the reset pin, and i got no advantage ..
tried to redo the code, i even tried a very simple code:

void setup()
{
  pinMode(5, OUTPUT);
}
void loop() {
digitalWrite(5,HIGH); delay(5000); digitalWrite(5,LOW); delay(4000);
}


still got 3.7V on Digital pins
what could be the problem ?!

larryd

Pins here go between ~0v and ~4.9v

You may have damaged you pins in the past.


Show us a good schematic of your circuit.
Show us a good image of your wiring. 
Give links to components.
Posting images: 
https://forum.arduino.cc/index.php?topic=519037.0






No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

srnet

http://www.50dollarsat.info/
http://www.loratracker.uk/

BJHenry

#3
Jul 16, 2019, 10:08 am Last Edit: Jul 16, 2019, 10:09 am by BJHenry
Cant see the image here.
You aren't missing too much...


adolfhack

You aren't missing too much...


So, i guess this shall work just fine

BJHenry

So, i guess this shall work just fine
Does it work just fine? That picture is too blurry to be of any use.

Smajdalf

I think you don't have the digital Vcc connected to power supply - bad soldering? It would well explain such behavior.
How to insert images: https://forum.arduino.cc/index.php?topic=519037.0

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