I have a LED in circuit which I want a circuit to detect whether it's on or not.
I have found ground and +ve of the circuit.
And I checked the voltage across +ve of LED and Ground, when it is ON, it came 0.36V
Now trouble is transistor need 0.7V to trigger, and Op-Amp Comparator(LM358) doesn't seems to work for this, also not sure why I can't detect this voltage on ADC of Arduino.
Please tell me if there is a way to clamp this voltage so that it trigger a transistor, or if there is other way to detect that LED.
Please help me on this !