PWM - pic18f4550 - led + potentiometer

[Bellon]

Hello. I'm doing my first program with pwm and am encountering some difficulties to do a small project. I want to vary the voltage of an LED as the turning of a potentiometer. However, the examples I found are with PWM own libraries, which I have not. I'm using a PIC18F4550 in MPLAB X.
If anyone can help me, I will be very grateful.

 

[Arouse1973]

Hello, what do you mean with PWM own libraries?
Adam

 

[Bellon]

A library file (header):
#include <pwm.h>

 

[Bellon]

The "Library Routines" are these (available in MikroC):
PWM1_Init
PWM1_Set_Duty
PWM1_Start
PWM1_Stop

I can use these in MikroC but do not know what to use to program the MPLAB.

 

[hevans1944]

@Bellon do you want to program the PIC using C or assembler?

 

[Bellon]

Using C

 

[hevans1944]

I don't do C much, but there should be a way to import those libraries into MPLAB. Try asking on the Microchip MPLAB XC8 forum. Might want to look at some of the links here too.

 

[smitthhyy]

I'd suggest having a look at this response to a similar question http://www.microchip.com/forums/m295647.aspx#328482 on the Microchip forum. It includes some C code for using PWM to contol the intensity of LED's.

Source: Google search. Affiliation: None, found using google.

 

[Amar Dhore]

Assuming you are using 8 bit micro,

For MPLAB, you can go through this Microchip's wiki: http://microchip.wikidot.com/8bit:10bitpwm
or if you have MPLAB with Harmony, you can generate code using Harmony configurator or use the Harmony example code.

 

[pgib8]

Forget the library, just write your own code. You will learn so much more, or do you want to be one of these people that do such exciting projects they talk about but in reality they just used a bunch of libraries and copy and pasted some code from the internet?

setting up the PWM should take you maybe an hour or two.
setting up the ADC to read the potentiomenter, probably 30 minutes.
tweaking some numbers, maybe another hour.
that's a very conservative estimate, in other words you can do it.
i myself could do the whole thing in probably 15 minutes or less. finding the right libraries and learning how to use them would actually take me longer... just some thoughts.