what is the best to send led array from ambi-tv to arduino

[yakirmalka]

hello,
i am new at linux (few weeks).
i would like to send the capturing RGB (easycap and ambi-tv) to my arduino.
build some array and send it via serial.

1. it will be fast enough for ambi light?
   2.some one did try this kind of setup?

[Phil1988]

I dont understand why you open this as you already posted here:
https://github.com/tvdzwan/hyperion/issues/6#issuecomment-33314426
read this carefully.

[Mrjohns42]

An idea. To reduce the data being transferred over serial, only send the values for LED's that change.

[Phil1988]

I dont think this makes sence because to "detect" which values change needs more time then sending the whole data to the leds.
Plus: most of the time every value is changing even if it is a little bit.

Note that the USB grabber on ambi-tv has a different chipset then the one you need for hyperion
(ambi-tv it is fushicai seen as 1b71:3002 on lsusb and on hyperion you need a STK 1160).

I had this setup and it worked perfectly from the speed.
Only problem are the bad colors at ambi-tv that my LEDs put out.
Thats why I switch to hyperion which is not running at the moment for my setup.

[Mrjohns42]

Are you certain? I would guess that checking an array is faster than transmitting a value via serial.

The actual benefit would of course be a factor of how many lights change on average from frame to frame.

[Phil1988]

Why should I write it if I am not certain?
I connected it with a baud rate of 38400 for 100 LEDs - higher value is no problem (checked also 115200).
On testing with standalone arduino a 38400 baudrate can support 25Hz of changing rate.
so yes: I'm certain.

[Mrjohns42]

We're talking about 1 memory access vs. however many instructions the driver uses to drive the serial line.