Hi,
I'm trying to use an older device with an arduino.
It's an old camera zoom control, you push it one way to zoom in and the other to zoom out, it is proportional, ie the further you press in either direction the faster it goes.
I've taken it apart and the zoom control is a 10k pot spring loaded to sit in the centre, then as you press either direction it adjust resistance, and if you let go it springs back to center.
I've measured the resistance with a mutlimeter.
At rest
pin1 - pin2 is 4k
pin 1 - pin 3 is 8k
pin 1 - pin 4 is 4k
pin 2 - pin 3 is 4k
pin 2 - pin4 is 0k
pin 3 - pin4 is 4k
When the control is all the way to the right
pin1 - pin2 is 5k
pin 1 - pin 3 is 8k
pin 1 - pin 4 is 4k
pin 2 - pin 3 is 3.3k
pin 2 - pin4 is 1k
pin 3 - pin4 is 4k
When the control is all the way to the left
pin1 - pin2 is 3.3k
pin 1 - pin 3 is 8k
pin 1 - pin 4 is 4k
pin 2 - pin 3 is 5k
pin 2 - pin4 is 1k
pin 3 - pin4 is 4k
So what this is telling me is
moving control to the right increases resistance pin1-2, decreases pin2-3, and pin2-4 increases(up to 1)
moving control to the left decreases resistance pin1-2, increases pin2-3, and pin2-4 increases(up to 1)
My question is to actually connect this to an arduino so I can work out which direction the control is going(and by how much.
I tried simply connecting pins 1 and 3 to 3.3v(the level the arduino I'm using uses) pin2 to ground, and pin 4 to A0. Using analog read it read something but the value was the same for either direction.
How exactly should this type of control be wired ?
Thanks.