MCP23008 IO Expander - Demultiplexer

Now I am using the HC08 quad AND gate to do the demultiplexer job.  The wiring is summarized below.

1. MCP3008 GP7 > ULN2803 Y7 > HC08 AND gate input 1.

2. AND gate input 2 > 2 pin connector > Gnd

3. AND gate output > right edge connector C7

Similarly for GP8  ... > C8

.END