DESIGN PROCESS OF ANTITHEFT DEVICE
Group 1: Adrian Burke, Michael Pellegrini, Daniel
Linderman, Colin Palmer, Markell Jones-Francis
STEP:1
COME UP WITH A RATIONAL PLAN
 As a group at first we were a little confused on what we needed to do in
order to accomplish the task at hand
 The Task: Our task was to come up with a circuit to get an Anti-Theft
device to properly function, in doing this we had to have green LED that
stayed active whenever there was no disruption of the heat sensor touch
sensor, or sound, then we had to somehow circuit a yellow LED that
would turn on once another light was activated, then afterwards we had to
circuit a red LED and an alarm buzzer so that when all three LED’s the
green, yellow, and red were activated the alarm would sound.
STEP 2:
DESIGN PLAN
 In order for our design we had to use Boolean Algebra, and translated the
Boolean Algebra into logic gates, we did this for each part of our task the
Yellow LED, Green LED, Red LED, and the Alarm.
 Green LED: A’ B’ C’
 Yellow LED: A’ B’ C + A’ B C’ + A B’ C’
 Red LED: A’ B C + A B’ C + A B C’
 Alarm Circuit: A B C
 In order to reduce the complexity of the system we combined like
components of the circuit, i.e. the AB AND gate from the Red LED was
replaced by the AB AND gate from the alarm circuit
STEP 3:
TRUTH TABLE
A
B
C
Output
0
0
0
Green
0
0
1
Yellow
0
1
0
Yellow
1
0
0
Yellow
1
0
0
Red
0
1
1
Red
1
1
0
Red
1
1
1
Alarm
DESIGN PLAN
STEP 4:
SIMULATION
 During simulation we first wanted to make sure that the designs that we
were using were correct, and if we were missing anything that would make
the circuits work, and also to make sure that we didn’t blow out any LED’s,
AND gates, and OR gates.
 Simulation at first conveyed to our group that we had few minor problems
in our design and that we had to go back fix our equations, and then
simulate once again.
 After final testing we assessed all problems that occurred during simulation
and were able to finalize our design and move onto building the actual
circuit for the alarm system.
STEP 5:
BUILDING THE CIRCUIT
 For the first class when we actually started to build the circuit we had
nothing working at all, we had no clue what we were doing, and we were
going to get our simulation to work on the actual circuit board.
 That same day we were enlightened more in depth by Naranjhan on how
Boolean algebra corresponds with the actual circuitry of the alarm system.
 After we solved the problems we encountered, then we moved on to
building the alarm system and the lights that it was composed of.
 Then we linked the circuits, which brought about the challenge of linking
them properly.