PWM question, how would you change the duty cycle on a chip like this one?
http://www.allelectronics.com/cgi-bi...M-2&type=store
I thought that you would some how set the duty cycle and it would stay at that particular rate. (I could be miss understanding you guys)
Quote: Originally Posted by mushin
lez is right though, the software needs to be constantly refreshing the LEDs to maintain colors. Ultimately, it is more elegant to have a uC (or hell, a display controller IC) handle this duty, but I'm sure 2n193r can tackle that step if and when he feels ready.
First I want to build it the way with the PWM then I can do it with PIC(I just read a little bit about them but they sound cool).
Well I will do that after I do this idea that is kind of pointless. Have the front door of my pc open automatically by some sort of sensor with 3 LEDs that are red that fade from dim to bright red. Then activate that sensor any have it close.
for LED pwm controller ICs. Maxim often have funky chips like this. You could then hook the chip to the parallel port in order to control it from the PC.
Linear Mode
