Week 1:

Circuits

Series Circuit

Our first experiment on this course was to make a Series and Parallel Circuit. The Series Circuit needed both switches to be pressed in order for the LED output to light up. This taught us how electricity flows in a circuit.

Parallel Circuit

We also made a parallel circuit where when a switch was pressed, both the LED's would light up.

Patient Monitoring Circuit

The Patient Monitoring Circuit is a processing unit for a coronavirus early warning home monitoring device for vulnerable populations. There were three main symptoms: Coughing, Low oxygen saturation, and fever. This Monitoring circuit is achieved by different indicators activating under different conditions: a green LED would turn on if the patient had no symptoms, a yellow LED for one symptom, a red LED for 2 symptoms, and an alarm would sound if the patient had all three of the symptoms. Only one indicator would be active at any given time, to make it easier for the user to identify the output of our circuit.

Logic Circuit Diagrams

Alarm Circuit

The first component that we built was an Alarm circuit. The finished product consisted of a 555 chip, a speaker, several resistors each with different values of resistance, a few capacitor, and a transistor.

Flip Flop and Timing Circuit

A flip-flop in digital electronics is a circuit with two stable states that can be used to store binary data. The stored data can be changed by applying varying inputs. The 555 timer circuit connected with the flip flop improves the overal functionality of the Covid circuit by allowing for more precise data. Every time the timer switches low, then the flip flop is able to recognize what changes were made in the data then releases it through the output, making the LED change depending on the inputs that the flip flop recieved.

Entire Logic

Flip flop

Green and Yellow Logic gates

Red Logic Gates

Assembly

In the process of assembling the simple circuits (series and parallel), the successes of our group were arguably overshadowed by the failures. Our series circuit failed to function at all, and our series circuit only partially function (only one of the LEDs lit up). We hypothesize that these failures were due to faulty connections within the circuits, or possibly some parts of the circuit being outside of the proper order. However, we went through several stages of making sure that the logic was correct, so we believe that it was not due to our logic.
During the assembly of our darlington pair circuit, it also failed to function during our first and second attempts to build it. After a complete teardown and rebuild it still failed to work. After a little bit of troubleshooting, we worked out that the transistors in the circuit were placed in the wrong direction. Flipping the transistors into the proper directions resulted in a circuit that functioned properly and brightly lit the LED.

Video Response to Discussion Questions

video2314376836.mp4

Research paper

Group 6 Research Paper Week 1

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