1. Logic Gates
Binary Day 3
PEOPLE 2016

2. Read the first page of the “Introduction to Logic Gates” worksheet

3. Logic Gates Performs a “logical operation” on one or more inputs
Gives one output
Outputs and inputs of logic gates are true (“1”) or false (“0”)
AND Gate

4. Logic Gates and Computers
Help computers transmit information between components
Logic gates steer signals through a larger circuit, similar to a stoplight directing traffic

5. Truth Table
Outlines specific input/output combinations for a logic gate
AND Gate A B Y ? 1

6. Truth Table – A “Real Life” Example
"If you wash the dishes and clean your room, you can go to the party."
Wash Dishes
Go to Party?
Clean Room
AND Gate
Wash Dishes
Clean Room
Go to Party? No
Yes ?
Wash Dishes
Clean Room
Go to Party? No
Yes ?
Wash Dishes
Clean Room
Go to Party? No
Yes
Wash Dishes
Clean Room
Go to Party? No
Yes A B Y ? 1
Wash Dishes
Clean Room
Go to Party? No
Yes ?

7. Fill out page 2 of the “Introduction to Logic Gates” worksheet

8. Today’s Activity
Use “real” logic gates – chips with built-in logic functions - to test these logical relationships
Even if you think you know how to fill out the truth tables, DO THE EXPERIMENTS!
In addition to filling out the worksheet, write down unexpected results and interesting observations
Working with breadboards

9. Breadboards

10. Tips for Using Breadboards
Connect ground to one column on the side of the breadboard and positive voltage to a second column
Place your chip in the breadboard so that each pin is in a separate row – what would this look like?
Use wire to connect ground and positive voltage to the same row as the appropriate pin (remember stripping the wire casing on the Christmas lights activity? You will need to do this again)
Connect wire to the appropriate rows on the chip from the input(s) and output ports located on the blue IDL 800 Digital Lab

11. Output Light Indicator
(On = 1, Off = 0)
Output Connection (put output wire here, look at corresponding light for each)
Connections for +5V and GND (Ground) are here
Input connections (put each input wire in a different connection, use the corresponding switch for each)
Input Switches (Change Input from 0 to 1)