reverse motor direction

[Haidar92]

Hi I need help with the following:

Time detection and shading: The LDR (photoresistor) sensor should be able to detect whether it is day or night (light or dark) . During the day, if the sun is so bright, special curtains should automatically shade the temperature sensors by the means of a motor. During night, the curtains should be automatically retrieved. Note that the user should have the ability to override whatever decisions the system might make regarding deploying or retrieving curtains.

I have done some work on the vi program. However I don't know how to reverse motor direction through labview. I am controlling the speed of the motor through DAQmx write counter freq (1 chan. 1 sample) function by a control knob. So I can't specify a negative duty cycle. Any suggestions?

my labview code is attached.

[Izzzzz]

Hello Haidar92, 

To help you reverse the direction of your motor I first have to ask you some questions. 

1. Does your motor have the capabilities to go both forward and backwards?

2. If it is capable of a reverse direction is there an input that has to be attached from your DAQ device (and driven high/ given a signal) in order to change the direction? 

3. Please check, and provide a link of the Users and Specifications Manual of your motor in order to see if and how we can accomplish a reverse motor direction. 

Best Regards,

Izzy O.

Applications Engineer

National Instruments

www.ni.com/support

[Haidar92 · Accepted solution]

Thank you for the reply. I solved the problem using an H bridge electrical component and connected to the Mydaq DO0 and DO1 lines

[KrizzerMachine]

How did you reverse it .. can you attach your VI i need it as a reference

[KrizzerMachine]

How did you reverse it .. can you attach your VI ? i can use it as a reference

[Haidar92]

Hi

Here is the attached file.  I have done this project a long time ago and no longer recall the specifics.

Hope it helps.

Best