Hi,
My project on the TLC5940 using arduino duemilanove gets the output.
I am using entirely TLC5940 library from
http://code.google.com/p/tlc5940arduino/
My first code was just simple full on/off each second. They seem to be working until I checked on the PWM waveform on oscilloscope.
When I set the LED fully off, the duty cycle from TLC5940 is indeed very close to 100% (that not exactly 100% was not a problem to me)
But when the LED if fully ON, the duty cycle is only 60%(I was expecting it to be almost 0%, or at least less than 10%)
Just for clarification, TLC5940 uses current sinking method to turn led on. Higher duty cycle means dimmer light and so on.
From what I observed, when I set the brightness to 4095(max) the duty cycle is just like this:
I am using a 5V to power the LED. All 16 Channels on/off at the same time. So the PWM is the same.
If anyone can tell me what is the problem here? Or this is just normal? Please. Thank you.