a

 

PWM normally has a fixed frequency but it can't have a fixed duty cycle. I can't help with the code as I am useless at writing in "C" (I work with assembler.)

Les.

 

A pwm with a fixed duty and fixed frequency is just a pulse frequency!!

From you wording!! Are you changing a 2~4v signal into a PWM?

 

You did not actually say what you want to accomplish.

 

I see... You have an unstable voltage 2~4v and you need the arduino to stabilise an output voltage at a certain voltage?

You do realise you can actually buy these for pennies... A boost convertor made from arduino is a bit overkill!!

 

Skip it!!

I'm not being an alarmist.... If you want to do it with an arduino, fine! I will help you.

I think the issue here is, we don't fully understand what you need to achieve.. I'm picking at straws trying to understand.

We are all here ready to help....

 

The only thing clear is that Arduino board will be sensing voltage between 2 and 4 volts.

You say output of the board is pwm. Then you start talking about adjusting frequency and duty cycle of pwm, and you looose me at this point since you do not clearly state what you want:
- adjust frequency of pwm
- adjust duty cycle of pwm
- adjust both

And now you started talking about leds.

So. No. It is not clear.

 

Threads fallen to pieces..... The TS has disappeared..