2: Automatic Meal Circuit

This circuit is based on an automatic feeding mechanism with an automated input of time in binary format. This includes a four bit binary input of the digit of time corresponding to the hour, as well as an input which determines if this hour represents the am or pm time. The idea behind this is to make an automatic feeder for a pet or such that feeds the pet as set times throughout the day, in this scenario, 6am, 12pm and 8pm. This is done through the use of three comparators made with a xor chip to an inverter for each pair of digits. The am or pm switch then acts as an enable pin for the outputs, where 0=am and 1=pm.

This circuit is a general combinational logic circuit made with comparators.

Below is the circuit on circuit verse.