Hi guys, thisi s my first post here, and I´m happy I found this site, the circuit I´m trying to make is the following:
Basically I have to preactivate the calculator so everytime you press the "=" key you get 1+1 and counts evrey object that blocks the light in the LDR.
My doubt is that how do I connect the calculator to the relay, I opened op the calculator and this is what I can see:
The red spot I marked is the "=" key, since I'm new in to electronics I really don´t have a clue how to connect the calculator to the spot I marked, also I would be really thankful if someone could explain me how the transistors are useful in this circuit (I really don´t know) and if the component VR1 works, since I simulated this circuit with a basci software "livewire", and when I increase or decrease it´s value it doesn´t change anything.
Also here is the link where I found this project and a video.
Link
http://www.youtube.com/watch?feature=pl ... sEGomCY9eQ