variable PWM duty cycle based on a feedback signal

Projects Programming
1

Hi, I am trying to vary the PWM duty cycle to control a small heat sink temperature. I don't want the user input to control duty cycle, but:

When uC is powered up, PWM duty cycle starts 0
If heat sink temperature > limit, PWM duty cycle ++
If heat sink temperature < limit, PWM duty cycle --

I am using UNO ATMEGA328, and I am trying to find examples for my experiment. Could someone provide me examples so that I can start?

Thank you.

2

For starters, PWM complexity is hidden by the analogWrite() function. Once you know how temperature is acquired, you simple follow the logic you have already given above.

3

how are you bringing in the temperature signal.

Most pre-written programs of this type will involve a pid library which may be what you are looking for.

4

By AnalogRead(Pin)

gpop1:
how are you bringing in the temperature signal.

Most pre-written programs of this type will involve a pid library which may be what you are looking for.

5

coldic1:
By AnalogRead(Pin)

prewritten examples can be found by googling arduino pid temp control

personally if you are learning or want to learn I think you can start with a temp reading code then just add the extra code.