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Problem Statement
Problem Statement
Carbon monoxide (CO) is a deadly, odorless gas, yet there is no widely used portable detection device for everyday use. Our project aims to make CO detection more accessible with a compact, portable sensor to help prevent poisoning. According to the CDC, about 100,000 Americans visit the ER for Carbon Monoxide poisoning per year and yet the general public lacks knowledge.
Project Scope
Project Scope
Our goal is to create a portable CO detector that provides continuous monitoring throughout the day. To ensure convenience, we aim to integrate it into everyday devices.
Design
Design
We chose the water bottle lid because it excelled in key factors like workable space and battery life, making it the most practical option. Its compatibility with different bottle brands ensures daily integration without inconvenience, while features like a long-lasting battery, digital display, and built-in speaker enhance usability. This structured decision-making process allowed us to select a design that balances functionality and user convenience as we move into development.
Figure 1: Complete CAD model of product.
Figure 2: Exploded view of assembly.
Figure 3: Section view showing electronics.
Figure 4: Isometric view of final render.
Analysis
Analysis
To ensure durability, the water bottle lid must withstand impacts from accidental drops. Analyzing failure points at various drop heights helps determine stress thresholds and typical usage limits. Our preliminary calculations guide material selection, thickness, and design, but we are currently conducting an FEA analysis for more precise results.
Electronics
Electronics
To develop the electronics system, we reverse-engineered comparable projects and conducted thorough research to select components prioritized for their compact size and low power consumption. We then verified the system’s functionality through breadboard prototyping and testing.
Figure 5: Simple electronics schematic.
Figure 6: Components connected with breadboard.
Next, we condensed the large messy breadboard, into a custom PCB, for a more robust, compact, and more reliable product. We designed 3 PCBs that connect to each other through pin headers and sockets for the most size efficient package, that keeps all the electronics level.
Figure 7: Custom PCB with integrated screen, sensor, buttons and buzzer.
Figure 8: Arduino pinouts for PCB.
Figure 9: Underside of assembled PCB showcasing the arduino nano.
Testing
Testing
Figure 10: Detailed design verification plan showcasing test results.
Figure 11: Voltage mapping from calibration test.
Figure 12: Experimental test setup. Shown left to right: dynamic gas calibration system, mass airflow sensor module, and zero gas pressure system.
Final Product
Final Product
As of Fall 2025 we are finalizing the system for the senior project expo!
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