Chief Delphi - Limit Switch for PCM

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GeorgeC

11-02-2007 17:43

Limit Switch for PCM

Can anyone help with an easyC mindbender?

I've used all of my available spike relay controllers and programming limit switches using them in easyC was straightforward.

Now i need to control a motor using PWM and a limit switch but I can't think of how to code in a limit switch.

What I want to do is program something like if limit==0 then PWM1 ==<127. However in easyC I can't see the actual variable to assign my values to.

I guess that PWM outputs are to program drive motors which don't usually need limit switches.

Anyone got any ideas?

mluckham

11-02-2007 23:02

Re: Limit Switch for PCM

Create your own variable to hold the value of the limit switch (connected to a Digital Input, of course).

Then you can do something like:

switchstate = DigitalInput(10); // read DI 10 limit switch
if (switchstate == 1)
pwm = 127;
else
pwm = something else;

PWMOutput(2, pwm); // output pwm value to PWM2

You are correct, the EasyC functions provided for PWM output do not include support for limit switches.

GeorgeC

12-02-2007 14:08

Re: Limit Switch for PCM

Thanks That's got me on the right track.

Nice to hear from someone who talks in EasyC

Regards

GeorgeC

Kingofl337

12-02-2007 15:06

Re: Limit Switch for PCM

Try this

Code:

if ( GetDigitalInput ( 1 ) && Input > 127 )

      {

            Input = 127 ;

      }

      else if ( GetDigitalInput ( 2 ) && Input < 127 )

      {

            Input = 127 ;

      }

If you are using an OI to PWM Block

Then delete it and add this.

Code:

Input = GetOIAInput ( 1 , 1 ) ;

      if ( GetDigitalInput ( 1 ) && Input > 127 )

      {

            Input = 127 ;

      }

      else if ( GetDigitalInput ( 2 ) && Input < 127 )

      {

            Input = 127 ;

      }

      SetPWM ( 1 , Input ) ;

GeorgeC

16-02-2007 13:21

Re: Limit Switch for PCM

Many thanks for taking the time to post the code

GeorgeC

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