19- Pulse Width Modulation (PWM) | mikroC Pro for PIC Tutorial 

sir i need your help

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+keshena naidu You are welcome

+tota896 You are welcome

+Hicham Bougaa thank you.

Which PIC are you using? Does ot have more than 1 PWM?

Your first question is not clear. Are you trying to get a variable frequency from PWM? You can't use different frequencies with PWM. Mikroc PWM libraries explains why: Some MCUs have multiple CCP modules. In order to use the desired CCP library routine, simply change the number 1 in the prototype with the appropriate module number, i.e. PWM2_Start();. All PWM modules use Timer2 for its operation, so you can not set different frequencies for different PWM modules. You can learn more from the library help page. There is also an example using 2 PWM: download.mikroe.com/documents/compilers/mikroc/pic/help/pwm_library.htm

Student Companion yes I've red every documents about pwm to vary frequency ,but not found any thoings, so what you suggest for stepper motor driver I need steps with variable frequency any other controller ?

Then you misunderstood PWM. All PWM use timer. You can't have a PWM with a fixed duty cycle. Then it's not a PWM, it's simply a clocked pulse. What basically you are looking for? There might be other options maybe even a simple 555 can give you a variable frequency eith just a variable resistor and capacitor.

Some pins are multiplexed with analog functions as the ADC and comparators. When these pins are yo be used as digital input/output pins, it's important to disable the analog features on these pins, this is done with the ANSEL and ANSELH Registers. A 1 will set it as analog and a 0 will set it as digital. The ANSEL controls PORTA, the ANSELH controls PORTB . We cleared all PORTA and PORTB as digital. To clear an individual pin use ANSx. You can learn more from the datasheet on Port analog control. In this example that code won't make any difference because there is no analog features on RC1 which is used as PWM pin, you can remove it. But if you connect anything to PORTA or PORTB, then you can consider that code. It's best practice in hardware to set unused pins to digital output then connect them to ground with a resistor to avoid interferences.

@@StudentCompanion sir bindle of thanks. Looking forward to your guidence in future tutorials. I didn't find keypad tutorial coz i dont understand correctly the hardware configuration of keypad. Thanks

You are welcome!

We don't have yet a video tutorial on keypad but you can watch this video it explains how to use the keypad: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-s6GXfBZRoRM.html

We also have more tutorials on our website. This is the keypad tutorial: www.studentcompanion.co.za/interfacing-matrix-keypad-with-pic-microcontroller-mikroc/

Your question is not clear, what do you mean by "sampled array which is derived from audacity and store it into rom memory"

And by the way, ROM means Read Only Memory, so you can't store anything in this memory because it's read only. No write allowed.

Can I have email address so I can send a program example

We have to understand first your problem before we can assist you. As we have said, we don't understand your question and you can't save anything in PIC ROM memory as it's read only. What exactly are you trying to save?

I want to save a raw data(voice data) which is obtained from a/d conversion from microphone

if (kp greater than 8 and less than 12 )kp=kp-2;yaha kp less than 12 hi kyu lia and lia bhi to kp-2 se kya fayda hua next step if (kp==14) kp=0; ye kya hai kp=14 kaise hoga jab keypad 9 tak hi hai agar hua v to kp=0 kyu

We don't understand what you are writing. write your question in English.

@@CLANFORD294 What are you referring to? We don't understand what you are writing. write your question in English.

You must connect the PIC MCLR pin to +5V via a pullup resistor (10K). Or disable the MCLR in code. In edid project menu.

@@StudentCompanion ok sir i am going to apply this

Ok. Let us know if it works

@@StudentCompanion yes sir it worked

Great!

There is the circuit diagram showing you how it should. What's your questions?

+Pakistani Urdu World we don't write codes for each and everyone who request it. We only assist with existing codes which have errors.

Hi. You could use the same principle explained in this video to change the duty cycle. The same analog voltage we used to change the duty cycle, you could use the output voltage: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-mHtI9m3aO3s.html

@@StudentCompanion Hello. Thank you sir for fast response does it work as feedback and it will automatically changes duty cycle when i add load on out put of buck converter?

You are the one who has to change your code/project for it to work as feedback by using the same procedure.

@@StudentCompanion ok thank you ill try it

You are welcome!

No one can guess what could be the problem based on that limited information. Which PIC are you using? What do you mean you can't use those functions? Are you getting errors? If yes, what errors?

We don't understand what you are writing. write your question in English.