Digital Output
Signals

Hex Display

7447 hex display decoder chip -
produces seven segment hex display signal

Uses:
o display analog
    sensor levels
o location in code

Design Issues:
220 ohm resistor used to limit current
and keep operating temperature at an acceptable level

address 0000h -
    bits 4-7
[to decoder chip]

Digital Input
Signals

Dip Switches Uses:
o run a specific section of code
o to set code parameters

address 0000h - bits 0-4