Hello,
I'm having a Nano where the low output on a pin is 0.8 V, which is too high for a external hardware watchdog.
Is it normal that a nano has 0.8 volt output when a pin is set to LOW?
Checked on an UNO, and the output there is nearly 0 V.
Hello thehardwareman
Take a view here to gain the knowledge.
It depends on what current you are trying to draw from the pin. Too much and it won't go low enough.
However this can happen also if you forget to set the pin mode to output in the setup function.
From the atmega 168 data sheet:
then your "hardware watchdog"" (can you provide a link?) is not working correctly.
Woops, my fault. The cause was phantom GND powering. I connected GND to D2, not to GND. I'm amazed that everything else worked OK.
Such things may happen when my eyes have problem to see clearly.
Good you solved it!
I'm amazed that everything else worked as expected. And this error is yet another reminder that I'm getting old 
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