up down pulse counter mydaq

[GregFlynn]

Hi

I am inexperienced with labview and I need help.

One of the elements of my project has a ring magnet with many magnet poles. I rotate this manually and produce a digital input to my Mydaq (Hall Signal from Hall sensor).

The counter (which can only count up on the Mydaq) counts the pulses and I multiply the output by 9 to read the angle of rotation.

My project requires me to rotate the ring magnet forward and back. 

How can I reduce the output angle when rotating backwards? i.e. create an up down counter.

With my limited knowledge, I tried using case structures and also shift registers, however I am unable to overcome the fact that the counter continues to count up when I change direction of rotation.

I have a trigger within my project to indicate change of direction

Please help......

Greg

[mikeporter]

The counter has to know which direction the thing is turning. If there is not only one sensor it can't. You need something like a quadrature encoder to get both position and direction.

http://www.ni.com/white-paper/4763/en/

Mike .

[GregFlynn]

Hi Mike

I can use a second input from a second hall sonsor so I will attempt the system in the white paper.

Many Thanks

Regards

Greg

[GregFlynn]

Mike/All

I am still stuck!

I am unable to determine the leading signal from the lagging signal.

Is it possible without the use of a counter? I only have one counter and it will only count up.

I have attached a file showing the input option that I have available to me

Help appreciated....

Thanks all

Greg

[GregFlynn]

All

Is it possible to count input pulses without a counter function?

If I can do this, I can achieve all I need to achieve.

I would need to be able to count up and down

Please advise if this is possible

Regards

Greg

[GregFlynn]

All

Got it sorted, I now am able to count up and down on two pulse signals....happy days!

Regards

Greg