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control led and pwm..

 
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zack



Joined: 30 Jan 2010
Posts: 4

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control led and pwm..
PostPosted: Tue Feb 23, 2010 6:30 am     Reply with quote
how i want to make my led flashing for 30 seconds...what is the command that i need to use..

what is the command to control the pwm for dc motor...
i want to control 3 different speed which will increase from slow until it reach the desire speed...

i use PIC 16f877A...

help me please...thank you...
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Tue Feb 23, 2010 7:01 am     Reply with quote
To flash the LED
Code:

int i=0;

While(i<30)
  {
   Output_high(PIN_D1);
   Delay_ms(500);
   Output_low(PIN_D1);
   Delay_ms(500);
   i++;
  }

That should flash your led for 30 secs....

As for the PWM.... I can't help you there. I only used sofware PWMs for RGB LED control not motors.

g
_________________
CCS PCM 5.078 & CCS PCH 5.093
jaimechacoff



Joined: 14 Feb 2010
Posts: 24
Location: Santiago, Chile

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PostPosted: Tue Feb 23, 2010 12:16 pm     Reply with quote
I believe you need a speed ramp.

look on google Trapezoidal Ramp, furthermore, PCM programmer gave us an example about it:

http://www.ccsinfo.com/forum/viewtopic.php?t=41473&start=3

good luck.
zack



Joined: 30 Jan 2010
Posts: 4

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PostPosted: Wed Feb 24, 2010 3:24 am     Reply with quote
Alright...thank you guys...I really appreciate that... Very Happy
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