Use an LED to activate a LCD screen

Projects General Guidance
1

Hey Guys,

I'm trying to build a game where the user needs to create an circuit to make an LED light shine. This is done by simply putting an LED on the right spot in the circuit (+ and -).
When the user completed the circuit it needs to get an code from the LCD screen to continue the game.

Now I'm wondering how I use the LED as button to trigger the LCD screen to display the code.

Any suggestions to make this work?

2

perhaps arrange the led when pressed to activate a small mechanical swirch - eg tact type?

regards

Allan.

3

I haven't thought this through and am (alas!) busy with work work, but is there any way you could use its voltage drop to swing an input pin? I'm visualising the LED as the bottom half of a voltage divider.

4

Thank you guys for the advise, i tried measuring the voltage drop and it was enough to trigger the next function.

Problem solved