Im playing with an LCD display,
Im trying to put a led in the circuit and a switch.
When the circuit is on by the switch, the led will light up.
But im having a problem, in the circuit there is the printer port and and 5v supply coming in. My problem is, the led is always light up when my printer port is plug, even if I dont supply the 5v.
How can I setup this for the led to light up only when 5v is supplied ? there seem to be electricity on the printer port.
I made a graph of my circuit as I tought it would work:
Im trying to put a led in the circuit and a switch.
When the circuit is on by the switch, the led will light up.
But im having a problem, in the circuit there is the printer port and and 5v supply coming in. My problem is, the led is always light up when my printer port is plug, even if I dont supply the 5v.
How can I setup this for the led to light up only when 5v is supplied ? there seem to be electricity on the printer port.
I made a graph of my circuit as I tought it would work: