50Hz PWM

saad.sharif · Post by **saad.sharif** » Sun Nov 17, 2013 9:56 pm

please any one can tell me how to make 50 Hz with pwm in flowcode.... i am using 4MHZ crystal please kindly tell... i shall be very thankful to you.....

Post by **Benj** » Mon Nov 18, 2013 5:24 pm

Hello,

I moved the post as it seems to be relating to a new topic.

Which version of Flowcode are you using? I think the Hardware PWM will not run this slow but it should be possible using a timer based software driven PWM.

saad.sharif · Post by **saad.sharif** » Mon Nov 18, 2013 6:32 pm

HELLO

i am using flowcode version 5.1...

brandonb · Post by **brandonb** » Mon Nov 18, 2013 9:27 pm

you'll have to set if up for your chip, and change c code to

Code: Select all

t2con=4; pr2=199;

YOUR PWM.fcf: (13.23 KiB) Downloaded 823 times

saad.sharif · Post by **saad.sharif** » Mon Nov 18, 2013 10:05 pm

HELLO

sir i am having 4 MHZ crystal and 16f887 pic micro controller... plz can u draw it with my requirements please...
i shall b thank full to you..

saad.sharif · Post by **saad.sharif** » Mon Nov 18, 2013 10:52 pm

hello brandonb

it is not working ....

brandonb · Post by **brandonb** » Tue Nov 19, 2013 3:05 am

here you are, this is a 50hz pwm 0-100% sweep program set up for your chip

YOUR PWM.fcf: (9.5 KiB) Downloaded 876 times

cheers

saad.sharif · Post by **saad.sharif** » Tue Nov 19, 2013 9:37 am

hello

sir if i want to add adc with 0-100% sweep .... please can you do it for me....
and thanks for the 50 hz...
saad shaarif

saad.sharif · Post by **saad.sharif** » Tue Nov 19, 2013 4:16 pm

hello mr brandonb,

sorry for disturbing you again again... sir i want to to out puts.. which work one by one for example if port A5 is 1 then port A2 is 0 and when port A5 is 0 then port A2 is 1... in this way i want 50 hz... and duty cycle must same on both ports...

please can u draw it for me....

and i have added adc to your pwm that you uploaded it i just want to see how you add adc with it...

saad sharif..
have a nice day sir..!

brandonb · Post by **brandonb** » Tue Nov 19, 2013 8:14 pm

when i get off work will get that done for you

saad.sharif · Post by **saad.sharif** » Wed Nov 20, 2013 9:01 pm

Hello brandonb,

please kindly help me i am waiting...... is there any problem for you to do....

saad sharif

have a nice day..!

Post by **medelec35** » Wed Nov 20, 2013 10:00 pm

Hi saad ,
All you will need to do is use an ADC component (ReadAsByte)
use a formula to convert from 0 - 255 to 0 - 100
assigned the result to a variable called pwm.
Finally delete

Code: Select all

pwm = pwm + 1

calculation box.
Then you will have a pwm duty thats will be controlled by ADC pot.

Can you please give it a go, then if your stuck, you can post flowchart for further assistance.

Martin

saad.sharif · Post by **saad.sharif** » Thu Nov 21, 2013 7:47 pm

HI MARTIN

i have done it as you told.. but i want two outputs of 50 hz pwm with the same duty cycle on both ports..
can you help me for that.

saad sharif
have a nice day.!

Post by **medelec35** » Thu Nov 21, 2013 7:58 pm

If you post a flowchart, with your modifications, what you want can be easily modified for you.

Martin

saad.sharif · Post by **saad.sharif** » Thu Nov 21, 2013 8:18 pm

Here is it...

Post by **medelec35** » Mon Nov 25, 2013 10:57 pm

Hi saad.sharif,
You can try this Flowchart

Martin

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