I'm really upset, so I'm coming to ask for your help.
I must be able to detect pulses of electric current (very fast). This electric current varies between 20mA and 70mA. It passes through a 100 ohm resistor. At 50mA, I have a voltage of 5V. Interrupts work well. However at 20mA (2V), 30mA (3V), the interrupts do not work.
Do you have any idea how I could go about it?
I had thought of a resistor and a capacitor but I can't do it.
Have a good day