stepper motor control

[o枫o]

Hello everyone:

    I wrote a vi these days,that I wanted to use it to control the stepper motor.But I was faild to attain my aim.I hope someone could help me to correct my mistakes in it.(My english is not very well,some mistake that I would make in it.)

     Words faild to express my thankness.

[Ali84]

Hello. I uploaded this VI a few days ago. It controls a Stepper motor, though it isn't a PID. Hope it helps.

http://forums.ni.com/ni/board/message?board.id=170&message.id=322006#M322006

Ali.

[o枫o]

Thank you.

     I have another topic:I want to measure the characteristic of  temperature sensor.But I am not familiarity to it.Do you have the vi or know where I can download it.

    thanks.

[Ali84]

Hello. Fisrt of all, what type of senesor are you using? An LM135? A thermistor? A thermocouple? What type?

And secondly, how are you communicating to the PC, via a NI USB DAQ, parallel port, etc.?

Ali.

[o枫o]

That design is one of my best friends. He plans to use Pt100. We use the data acquisition. The vi just can measure the parameters of the temperature pickup is ok.

[o枫o]

I urgently need it.

[Bob_Y.]

o枫o,

I have not worked with the PT100, but I read about it.  The pt100 is an RTD (Resistance Temperature Detector).  This means that it changes resistance due to changes in temperature.  To measure resistance with a DAQ device, you measure the voltage drop across the device.  I would set up either a simple voltage divider, a Wheatstone Bridge, or a Kelvin Connector.  Wikipedia has a good article about measuring RTDs.  You may use a separate power supply or just supply voltage from an analog out channel on your device. 

This linked chart shows the temperature to resistance relationship expected from the device.

I hope that this helps,
Bob Young

[o枫o]

Thank you very much.