Hi !
I want to create led matrix of 288 pixel (12x24)
I'm asking you just to confirm my hardware list, let's see :
And just 2 questions :
I saw in few tutorials that some people used resistor in the data line, and a capacitor parallel across the power supply. Do I have to do this ? why ? And if yes, how much ohm for resistor and which capacitance for capacitor ?
Thanks to all !
I saw in few tutorials that some people used resistor in the data line, and a capacitor parallel across the power supply. Do I have to do this ?
Yes.
how much ohm for resistor and which capacitance for capacitor ?
Between 220 and 470R not very critical but it helps damp down reflections and ringing, see the trace attached.
Capacitor at least 470uF and with such a big matrix I would put one at both ends of the power chain at least.
Thank you for explainations Grumpy_Mike 
What do you think about hardware that I choosed ?
Well the Arduino is a fake and I haven't had experience of the LEDs and power supplies so I can't say one way or the other, but nothing springs out looking at the links.
