however If i could just find something as simple as
I love to prove people wrong even if it is only me.Yes to drive a common cathode RGB LED on a TLC5940 you just have to connect the cathode to the chip output, and then switch each colour anode in turn in a multiplexed manor.It is late here in the UK now. I will post some diagrams of how to do this in the morning.
Quotehowever If i could just find something as simple asIf you are doing this sort of magnitude of project you have to be able to read a schematic. You can't stay in kindergarten forever.
Is there any reason that I should be doing this project by multiplexing CA instead of CC?
if I could just turn http://tlc5940arduino.googlecode.com/svn/wiki/images/breadboard-arduino-tlc5940_close.png into something multiplexed to require less wires,
QuoteIs there any reason that I should be doing this project by multiplexing CA instead of CC? Well apart from that is what you asked in your thread no.Multiplexing with common anode is what I did in the Hexome and in the mini Monome http://www.thebox.myzen.co.uk/Hardware/Mini_Monome.htmlAs multiplexing with the TLC5940 chip involves switching a positive supply to something, with common anode LEDs that something has to be a separate LED with the different colours going to different TLC chip pins. This is the more flexible because it allows you arrange what on / off ratio of multiplexing you want and also if like the Hexome you have one chip for each colour it allows the chips to be set at different currents to achieve a white balance directly in hardware.With common cathode you are forced to switch the individual colours and put one LED through one TLC chip pin.Quoteif I could just turn http://tlc5940arduino.googlecode.com/svn/wiki/images/breadboard-arduino-tlc5940_close.png into something multiplexed to require less wires, Start off by looking at the schematic of that and seeing how it relates to the physical layout. It is not at all a difficult skill going from a schematic to physical layout. Once you have done one or two it will be second nature. It is very easy to spot errors in a schematic and it is virtually impossible to do this with a physical layout picture.
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