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# Group 3

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by

## Darin Gray

on 20 July 2015

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#### Transcript of Group 3

Professionally Approved
10 Cool 100 You
Computer Circuit Simulations
Week 1:
This week we combined biomedical engineering and electrical engineering to build circuits that could preform various functions. We also learned the fundamental skills of engineering.

First, we learned the basic concepts of building a circuit using the computer circuit simulation program, Yenka.

Circuits
We learned how to build various circuits. Using battery holders, wires, resistors, bread boards and various other supplies, we built several circuits with LEDs and switches.
Using Yenka
Things explode

Gates and Truth Tables
Decimal and Binary Numbers
We learned
Decimal to Binary / Binary to Decimal
Binary Logic
Implementation of binary numbers to create
truth tables.
OUR PLAN
At the beginning we created 9 combinations with the different outcomes for the RED, GREEN and YELLOW LED's.
Built a system to let people know if they will be admitted to a college of their choice based on certain criteria.

The final design was simpler than the original
Medicine Delivery System
Our Assignment this week was to design and build a circuit that would dispense medicine and/or warnings to people depending on their risk factors for negative reactions to the medicine.
The Plan:
Group members split up to maximize efficency
Michelle and Paula: used the diagram in the lab manual to build alarm successfully
Rahul, Andrew, and Kevin: built the 555 timer circuit and the main circuit consisting of the AND gate, invertor, and the flip flop.
The entire group (with the help of our insturctors) helped with debugging
We split up the work to finish on deadline and made sure each individual part of the circuit was working before we put it together.
On the left we have player one and on the right we have player two
On the far right we show what light will turn on if a certain combination is played.
Using Yenka we learned...
How to test our designs for feasibility and performance
Ohm's Law
relationship between Current and Voltage
Logic Gates
The #1 thing we learned this week was...

"When engineers fail... people die"
- Darin Gray
Thank you for listening!
Truth table for Rock, Paper, Scissors circuit
Boolean Equations
AND, OR, and inverter gates
Setting up truth tables
Converting truth tables to circuit diagrams
Using Gates and TT to build functioning circuits
The finished product:
Process: The Alarm
We followed the lab manual to construct the alarm portion of the circuit.
Our first try was unsuccessful, but after receiving assistance we found that we had forgotten to connect a wire from 1 to the negative part of the bread board
Attempt #1
After correcting this mistake, our alarm worked.
<-- still alive
Rock Paper Scissors
This was our plan for the rock, paper scissors circuit.
use 3 switches (instead of 2) in order to make it easily usable for younger players.
used 9 AND gates, one for each combination (r:r, r:p, r:s, p:p, p:r, p:s, s:s, s:r, s:p)
made a yellow light indicate a tie, a green light indicate a win, and a red light indicate a loss.
We planned to wire the switches and AND gates on one bread board and connect that to another, smaller board with the LED lights
used 4 switches for this circuit
One switch represented ACT, one represented the SAT
other two represented geology and psychology.
SAT or the ACT, were connected to an OR gate.
psychology or geology were also connected to an OR gate.
We then connected the two outputs to an AND gate.
Process: 555 Timer
Process: Main Circuit
Putting it together:
We then connected the alarm to the main circuit and 555 timer...
Principles:
In order to build this project we needed to use our knowledge about AND and OR gates and parallel and series circuits as well as the skills we acquired using the program Yenka.
This project can be considered biomedical engineering and electrical engineering, because we used complex circuits to preform a task to meet medical demands.
Individual Roles:
Andrew-
Kevin-
Michelle-
Paola-
Rahul-
Successes/Obstacles
SUCCESSES:
Our project ended up being successful, when we indicated no risk factors, the green LED turned on. When we indicated two risk factors, the yellow LED turned on. When we indicated three risk factors, the red LED turned on. When we indicated four risk factors the alarm sounded.
OBSTACLES:
When we finished assembling out project, nothing happened when we flipped the switches. We checked the voltage and found the our batteries were dead.
Other obstacles we faced included...
loose connections
losing track of wires
Backwards LEDs
Connecting the speaker to the flip flop
How we would start differently/improve?
Check battery voltage constantly while debugging
For the college admission project we would split up the work vs. everyone working on one breadboard
For the alarm, we would make sure everything was plugged in correctly
Avoid loose connections
Do not over complicate circuits
Increased ON/OFF time for Medicine dispenser circuit
Basic Circuits
Learned concepts of series and parallel circuits
Learned basic electrical engineering skills
We learned to coil wires around switch to avoid loose connections
Arduino
We learned...
Basic Arduino commands
How to connect and control LEDs with the Arduino
Different parts of the Arduino board
How to use the Arduino programming platform(IDE)
We successfully built one combination for a tie, however due to time constraints we were unable to finish
Used diagram in packet to build timer
Timer ON: 1.33 sec
Timer OFF: 997 ms
used computer program to calculate OHMS for resistance
The Alarm
To overcome obstacles we came together as a group and discussed the problem. If we could not figure out the problem, we asked for help.
unfinished rock paper scissors circuit
Lessons Learned:
Connected switches to AND gates and inverters.
Connected output of AND gate to flip flop
Connected flip flop to LEDs
Color Code
Red = Power
Black = Ground
Yellow = AND gate --> flip flop
Teal = Input --> invertor
Most time spent debugging
Connecting loose/ unconnected wires
Switching poles of LEDs
We learned the importance of being careful when assembling our project
Paying attention to details, because one loose connection can cause the whole circuit to not work.
Being open minded and collaborating with other group members
Yenka
series circuit
Medicine dispenser
Yenka
parallel circuit
Medicine Dispenser
Yenka
parallel circuit
Medicine Dispenser
Yenka
series circuit
medicine dispenser
Yenka
series circuit
medicine dispenser
Rock paper scissors logic circuit
Building Rock Paper Scissors circuit
Rock paper scissors logic circuit
Vending Machine Circuit
Building Rock Paper Scissors circuit
Building rock paper scissors circuit
College logic circuit
College logic circuit
Arduino

Original plan was very complicated
Learned how to use a breadboard
Learned and practiced truth tables and logic diagrams
Difficult to create the truth table (pictured to the left)
Used binary to represent different inputs and conditions
Too time consuming and complicated to build
Full transcript