Bi-color LED matrix

Because we could not find a RGB LED matrix as I mentioned in my previous message we're now going to use two 5x7 bi-color LED matrices. We chose the TBC20-11EGWA , this is a 5x7 LED matrix with the colors red and green (with yellow/orange as the third color, this is the color you get when both the red and green led are emitting light).

Here you can see the schematic of the 5x7 bi-color LED matrix:

Here you can see the complete schematic of the PCB we are going to make:

As you can see there are some other changes besides another LED matrix, we decided to use three 8-bit I/O expanders (PCF8574) instead of the shiftregisters. These are I/O expanders you can control with I2C. We already used I2C with the arduino uno so that makes it easier for us to write the program later.

Below you can see the schematic for driving one segment, the other one is almost the same except for the hardware addresses of the remote 8-bit I/O expander PCF8574.