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LOGNO
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Join Date: Sep 2008
Location: INDIA
Posts: 3

PWM Prog in C

09/30/2008 12:46 AM

I am using PIC 18f2620 to generate PWM signal .what is the program code for PIC C18 Compiler? How can I set this PWM signal in specific PORT ?
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Anonymous Poster
#1

Re: PWM Prog in C

09/30/2008 11:19 PM

Can't actually help with the program code.

just wanted to suggest you use a 666 (2x555) chip instead. Much simpler. one timer sets the pulse start the second the length (pulse finish) I've used them for one off servo control in the past.
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indel
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Engineering Fields - Electrical Engineering - New Member

Join Date: Oct 2007
Location: Sour Lake, TX 30°08'59.68"N 94°19'42.81"W
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Good Answers: 13
#3
In reply to #1

Re: PWM Prog in C

10/01/2008 7:20 PM

666=evil (Newton said it!)

Mono timer 555

Dual timer 556

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Richard_Damon
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United States - Member - New Member Engineering Fields - Electrical Engineering - New Member Fans of Old Computers - Altair 8800 - Long time Computer Geek

Join Date: Oct 2007
Posts: 6
#2

Re: PWM Prog in C

10/01/2008 10:05 AM

The 18F2620 has a built in PWM generator. You just need to set up the appropriate registers and you should get the right signals out. This can provide you with a PWM signal on the pins marked CCP1 or CCP2 (Capture/Compare/PWM). IF you want it on another pin ... no you don't want to put it on another pin. Read the datasheet and app notes.
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LOGNO
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Join Date: Sep 2008
Location: INDIA
Posts: 3
#4
In reply to #2

Re: PWM Prog in C

10/05/2008 12:53 AM

THANX, BUT I WANT TO GENERATE A VARIABLE PWM SIGNAL WITH FEEDBACK CONTROLLER. WHAT R THE STEPS OR THE SAMPLE CODE IN C18?
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LOGNO
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Join Date: Sep 2008
Location: INDIA
Posts: 3
#6
In reply to #2

Re: PWM Prog in C

11/10/2008 11:50 PM

CAN U GIVE ME THE CODE OF PID CONTROLLER USING PIC?

OR ANY SUGGESTION!

NEED URGENTLY
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Richard_Damon
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United States - Member - New Member Engineering Fields - Electrical Engineering - New Member Fans of Old Computers - Altair 8800 - Long time Computer Geek

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Posts: 6
#5

Re: PWM Prog in C

10/08/2008 1:46 PM

I haven't used C18, so I don't have exact code. Changing the PWM value appears to just require writing the new duty cycle into the appropriate register. How you compute that value is up to you.

Have you looked at the sample code on the Microchip web site?
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