It's time to make a good diy interface for me and it's the first time I write a schematic. So i want to post it here hoping that someone will see it and write me if there's some horrible mistake.
Basically I want to:
1. Connect 16 pots to my arduino board through CD4067BE (by texas instruments).
2. Drive a 4x4 bicolor (red/green) ledmatrix through 74HC595N and 4 transistors 2N3904 (the transistors connect the columns to ground).
3. Use the same 4 transistor to drive the rows of a 4x4 switch matrix.
I've never build a led or switch matrix and I've never multiplexed before so I'm not sure that my schematic will work.
I have some questions:
a. It's the CD4067BE arduino compatible?
b. It's the 74HC595N wiring right?
c. It's the 2N3904 fast enough?
d. It's a good idea use the transistor for both matrixs?
e. Will it work?
You'll find the schematc's link in the next post because I can't post links in my first post.