Rainbowduino x 4: Request for getting-started advice

Hi, everyone!
Ive got 4 Raibows, 4 led matrix 8x8 and 1 Arduino UNO.
I want to make led-matrix 16x16. But… cant :slight_smile:

I cant making work 1 Rainbow either.
What i do? I wire Rainbow to arduino like that:

and uploading demo code to arduino via USB.
Uploading successfully, but matrix only blinking 1 red pixel and that’s all. I spent all my day, but cat get it what i doing wrong.
Please, give me advice, keyword to google or just hint. Thank you!

Your diagram shows some strange connections: Reset-> DTR? Ground -> RXD?!?

I think you need to study the connections more.

this is not my idea its here in wiki http://www.seeedstudio.com/wiki/Rainbowduino_LED_driver_platform_-_ATmega328 screenshot https://www.monosnap.com/image/LX4ENvOEu3fk63PBtyF7ry3sq

so what is right connection?