Led dimmer without any ADC input from STM32 dev board

Programming
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#1

Hello Everyone!!
I hope you are all going well.
A couple of months ago I dimmed a led with PWM by using a potentiometer rotation in order to monitor the brightness of the Led with STM32 board.
Now I want to control the brightness of the Led without any potentiometer.
As a matter of fact, From a 100% of the brightness of my Led, I want to be able to lower this brighness atleast at 25% without any potentiometer. The code that I have doesn’t allow me to reach it out.

Any help is welcome.

Thanks in advance

#2

Do you mean, you want to remove the potentiometer from your already existing code and modify the code in such a way that the brightness of the LED is maintained at 25%?? If that is the case, please post your code.

1 Like
#3

Yes that’s it.
Please find bellow my code based on the PWM.

int duty_c;

		for (duty_c = 0; duty_c < 100; duty_c++)
		{
			__HAL_TIM_SET_COMPARE(&htim12, TIM_CHANNEL_1, (duty_c)*400);
			HAL_Delay(100);
		}
	
		for (duty_c = 100; duty_c >= 0; duty_c--)
		{
			__HAL_TIM_SET_COMPARE(&htim12, TIM_CHANNEL_1, (duty_c)*400);
			HAL_Delay(100);
		}