Email: Password: Remember Me | Create Account (Free)


 

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Chico Magalhães
02/17/10 15:17
Read: 927 times
Florianópolis
Brazil


 		 #173231 - 89S52 and multiple PWM
Hello.
I want to control some RGB LEDs using an 89S52 receiving the data via serial.
After some tries I discovered it is an exchange of the actualization rate (frame rate?) and number of outputs... the more outputs the less "frame rate"
With 8 outputs I would get around 30 "FPS" which is ok, but I may need more outputs and want to code some more things here.

So I'm asking you for some idea on how to deal with it without changing the uC...

I was thinking in some type of external PWM IC... maybe I2C, does exists some like this?

I thought also in doing part of it analogic, something like this I dont know if works: some latches ICs with a R/2R net driving a transistor that drives the LED, this way I would only need to use the uC time when need to change the output.

Any idea is welcome.

Thanks.

List of 23 messages in thread
TopicAuthorDate
89S52 and multiple PWM      Chico Magalhães      02/17/10 15:17      
   Speed      Steve M. Taylor      02/17/10 15:19      
   is 2 times 5 less than 8?      Erik Malund      02/17/10 15:43      
      processor sugestion + PWM IC      Chico Magalhães      02/17/10 18:06      
         you need to describe EXACTLY      Erik Malund      02/18/10 08:17      
            what I want      Chico Magalhães      02/19/10 02:32      
               clarify?      Andy Neil      02/19/10 02:51      
                  1st DMX 2nd auto      Chico Magalhães      02/19/10 03:03      
               ???      Erik Malund      02/19/10 07:06      
                  Agreed      Andy Neil      02/19/10 07:11      
                     RGB and PWM      Chico Magalhães      02/19/10 13:48      
                        ???      Erik Malund      02/19/10 18:42      
                           GIVING UP!      Chico Magalhães      02/19/10 19:04      
                        What is the point of it?      Andy Neil      02/20/10 01:18      
                           misunderstood      Chico Magalhães      02/20/10 08:16      
                              ideas and giving up      Erik Malund      02/20/10 08:50      
   look at some servo code (recently published on this forum)      Frieder Ferlemann      02/18/10 01:25      
   Faster PWM      Hans Van Pelt      02/18/10 06:14      
      PWM      Chico Magalhães      02/19/10 19:21      
         check this      Dileep Shenoy      02/20/10 06:00      
   randomly bumped on TM1803      Chico Magalhães      02/25/10 02:20      
   PCA9685      Maarten Brock      02/28/10 13:10      
      tlc5947      Maarten Brock      02/28/10 13:22      

Back to Subject List