How to generate two channels digital ouptut from one PWM signal in labview, one for heater and other for cooler? Any PWM temperature control example?

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Ruthber Rodriguez

Hello, Jure Krolo

Could you review this material is very interesting.

http://forums.ni.com/t5/Discusiones-sobre-Productos-NI/Generar-se%C3%B1al-PWM/td-p/1703000

http://www.ni.com/tutorial/2991/en/

Best Regards,

G.s. Vasantha Kumar

Dear Jure Krolo

Instead of generating 2 different signals you can make use of the relay's NO & NC contacts for heater and cooler.The advantage is that at any point of time only on of the device is turned on.It doesn't require monitoring whether one of the devices is turned off while the other is working.

regards

vasanth

James Garry

Vasanth,

I think that Jure is better off with two independent channels - I have written PID and PWM codes in LabVIEW (Jure: email me and I can send you LabVIEW 8.0 codes) but there are times when one wants to be neither warming nor cooling.

So having a logical NOT on one channel to drive the other is not a good idea.

Jure Krolo

Thanks for your answers. James i send you message with better explanation of the problem, but you are right, there are times when one wants to be neither warming nor cooling. My other problem is to connect PID with PWM.