Covid Detection Circuit

Project Overview

The purpose of this project is to build a circuit designed to detect the novel coronavirus. The goal is to design and build a circuit that triggers different outputs based on multiple possible combinations of inputs. There will be three different symbols representing three different virus symptoms. If we need to show these symptoms in the circuit, we need to build logic gates to represent them, and then complete the circuit by connecting the logic circuit, LED lights, alarm circuit, timing circuit, and flip flop circuits.

Alarm Circuit

Overview

The alarm circuit was the component our team struggled on the most. Although there was a given diagram to follow, our group struggled early on and it took 8 attempts to eventually build a successful alarm circuit. Through these struggles, we were able to problem solve and understand our strengths and differences, benefiting our teamwork overall. The alarm was built using a 555 timing chip with components unfamiliar and new to many of us, but we worked together to achieve the final product. There was also a lot of research behind this project so that we understood exactly what we were working with and how these components actually work. Examples are the different resistors, transistors, speakers, etc. Overall an experience that actually helped us for the projects ahead of this one. The skills we learned as a result of our struggles and the knowledge of components benefited us throughout the week as we worked together to build the rest of the covid detection circuit.

Alarm Circuit design on CircuitLab

Physical Alarm Circuit

Logic Gates

Overview

The logic gates are the most important part of the circuit that can operate, which determines when the LED light will light up. The different types of logic gates include AND, OR, NOR, NAND, NOT, XOR, XNOR, etc gates. Our group had to get a grip on the basic gates to create a working logic circuit that wasn't too complicated and got the task done for being a covid detector. For example, the goal for the red LED to light up would be if the circuit tested true for two or more symptoms.

Original Logic Gates CircuitLab Design

Physical building process of the Logic Gates System using the simplified version of the CircuitLab design

Timing Circuit

Timing Circuit design on TinkerCad

Physical build of the timing circuit

Flip-Flop

Overview

Out of all the circuits needed to be made, the flip flop circuit seemed the most easiest. We simply had to understand the flip flop schematic and that there were inputs (Dn) and outputs (Qn). We used a total of 8 wires, one being an output and input of a specific LED we wanted to turn on. The red wire signifies the red LED, green for green LED, yellow for the yellow LED, and the balck white connecting to the alarm system on a separate breadboard. Each input wiring of the LEDs were open ended to allow for the connection of the other circuits to form our final COVID-19 detector circuit. The flip flop was basically an output signaler connecting the entire system.

Physical Design of the Flip Flop Circuit

Completed Circuit Results

Conclusion

Although our completed circuit did not complete all of the functions or goals that we were trying to achieve, it did partially work as the green LED worked and the alarm would sound. After completing the circuit we spent a lot of time troubleshooting issues and trying to make the other LED lights work as well as the green LED. We did end up finding and fixing some small issues while troubleshooting misplaced or touching wires, but in the end the circuit did not completely work as we intended.

Image of the final circuit with all of the separate circuit components connected together

Flip Flops

Timing Circuit

Alarm Circuit

Logic Gates

IMG_6193.MOV

The green LED lighting up on the final circuit

IEEE Week 1 Report

Week 1 Patient Monitoring USC Discover Engineering .docx

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