Do the same test between the Mini Pro and the Darlington.
If the Mini Pro is really burned, try 5v to the Darlington input. What amperage are you showing there?
I was using Ohm's Law, but a current meter should do.
Please call the board Pro Mini.
mini pro is a drone.
So that 1 or 2mA and that sounds about right.
Try a lower current setting to get a more acurate reading just to be sure.
Collector-emitter current looks good.
My concern would be the base-emitter current. That is what will overheat the Arduino.
Wait!
The diagram you show for the DIP IC connection in post #39 is wrong.
The Mini GND should connect to pin 8 NOT 9.
The connection for the breakout board is OK.
Disregard my comment about about the DIP IC connection.
My mistake it's correct.
Powered up a new board. When on, at the output pin, 4.8 v and .094 mA.
What should I test nest?
That's 100ma if my math is correct. Too much.
Is the ma or amps?
maybe im testing the wrong spots. Can you point me to the correct locations?
What is connected to the output pin?
94uA is very very small.
Nothing is connected at this point.
Then the current reading is just noise.
I don't want you to burn out another mini, so I don't recommend connecting anything to it until you find out what is wrong.
Have you checked the current on a lower setting like I asked in post #64
Do you mean checking for volts or apms.
Just to make sure I;m reading the amps correctly, could you send an image confirming the locations Im taking the reading from.
One last time. I would use a 470 ohm resistor between the Arduino and the Darlington. That way if the Darlington is short circuit, it won't damage the Arduino pin.
I gave you the diagram in post #60
Try a lower current setting.
I don't recommend connecting to the Mini at this point
DON'T USE THE MINI
Use the diagram I show in post #60
See post #60
