How long are the connections between the tlc's?Also, which tlc's are the ones flickering? The last two on the chain or is it random?
I suspect you have no decoupling capacitors on the TLC5940s.http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html
Would I run a 0.1 µF capacitor between those two pins on each IC, correct?
First, I'm an electronics noobie. I've daisy chained 4 TLC5940s on a breadboard exactly as shown on the Arduino TLC5940 Library page and a total of 21 RGB LEDs. One diversion from that setup is that I used a 2.2K resistors instead of 2K resistors (my local Radio Shack didn't have 2K resistors).It works pretty well expect that sometimes one or two of the TLC5490s flickers it's LEDs. Any ideas?
So why the speed is different? Is it because of the faster clock speek on UNO?
But I thought the example would have taken this into account when I change the board setting in the arduino menu.
And why the flickering disappears on the Nano but not the UNO?
Other problems may be coming from energy consumption of TLC5940.TLC5940 draws fairly large power (5V,100mA, etc.) with careless programming implementation.This causes instant drop of the voltage and makes flickering.This voltage drop sometimes cannot be compensated by 0.1uF capacitor, especially when you are using a small voltage regulator.