Algodoo

This only works when the crank is turned counter-clockwise. That's because the angvel value can be positive or negative depending on the direction that the circle is rotating. You can fix that by calculating the absolute value of angvel as follows:

x = angvel;
x < 0 ? {x = - x} : {};
scene.my.ang = x

Well, I do it diffrently because it's like real life. If you turn a crank the right way, the LED lights up. That's why I did it in a way that simulates real-life... Well not really, but that was a test project. This is what I used.

Thank you for informing me.