Hello!
I've a black box containing a resistor and a led connected in series to the resistor by it's anode.
The black box has two accessible terminals: terminal 1 (which is the free resistor's lead) and terminal 2 (the led's cathode)
So I connect the black box to a voltage source and begin a sweep from 0 to 5V.
When I reach the led's drop voltage, about 1.2V, it obviously turns on, and current starts flowing thru the black box.
Now my question is: how can I detect that the led is on? I would need a circuit that gives me a logical 1 if current is flowing by the led and a logical 0 if not.
How could I easily do it?
Thank you very much!!
:?
I've a black box containing a resistor and a led connected in series to the resistor by it's anode.
The black box has two accessible terminals: terminal 1 (which is the free resistor's lead) and terminal 2 (the led's cathode)
So I connect the black box to a voltage source and begin a sweep from 0 to 5V.
When I reach the led's drop voltage, about 1.2V, it obviously turns on, and current starts flowing thru the black box.
Now my question is: how can I detect that the led is on? I would need a circuit that gives me a logical 1 if current is flowing by the led and a logical 0 if not.
How could I easily do it?
Thank you very much!!
:?