Rover Mini SPi and MPi Stepper Motors
Turbo Mini Forums

Max steps is 180, steps to extend is 190, therefore it drives the valve another 10 steps to ensure its closed.

Thanks, I'll rescale it.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

check it by setting all the 'steps' in the temperature bins to 180, then the cold crank and the warm crank to 180 as well.

Turn off the ignition and back on again, the valve should motor fully closed and then open to max, you should only be able to hear it click a couple of times as it hits full open.

Try it at 170, if no clicks heard its not reaching full open.

Set it 10 steps above the maximum to ensure it can drive full closed from full open. The algorythm counts steps from fully closed.

The official rover valves are 180 steps whether wired for bipolar or unipolar, i cant see this being much different if the lead screw is the same.

Well, it was not actually working correctly when fitted on the car and seemed eventually to fail altogether.

I went to the scrappy and got a couple off some Peugeot 1.6s.

These both seem to work fine. But to get them to fully close, I had to set the start steps to 300.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

does any one know where to get connectors to fit the 4 pin steppers?

well at least you got an answer

true.