Hi @valerio,
Great to hear you have solved the mystery and saved a good board from premature retirement.
re: I've just discovered that the issue was completely different.
This is why Ron (@zander) and I both tried to suggest logical fault finding paths. They were different in detail, but both tried to isolate the problem.
I note you said:
Since there is no continuity between the input and GND of the voltage regulator (and thus no voltage)
If you were trying to measure the input to output 'resistance' with a multimeter switched to Ohms/resistance, then I am afraid you were mistaken.
Checking moderately complex devices like regulators is usually only possible by applying power to the circuit and ensuring that all of the 'input' voltages are present, then look for the outputs.
Hope your project can proceed and good luck, Dave
@zander @davee @inst-tech @inq @frogandtoad
I've just discovered that the issue was completely different.
I had soldered the barrel jack that connects the protoboard and the batteries wrong.
Since it had 3 pins and I went by what I remembered from seeing it in Eagle, I soldered to the incorrect pins.
Now it is fixed, and the Arduino I thought was broken works without issues.
Indeed, As you can see, there are more than a few things that can go wrong when modifying your boards..
Trouble shooting is a logical process, and requires all relevant information as to modification made, current loads, voltages magnitudes applied etc..It's extremely difficult to diagnose a problem when all the information is not at hand.. having said that, well done finding and fixing your problem..
Experience is what teaches us, and allows us to move forward.. making mistakes is all part of that process.
regards,
LouisR
LouisR