Concluding Thoughts

As this project comes to an end, I’ve spent a lot of time reflecting on everything I learned throughout the process of designing and testing my hydration-monitoring patch. When I first started this project, I honestly thought the biggest challenge would simply be building the device itself. However, I quickly realized that the real difficulty was figuring out how to accurately measure something as complex and dynamic as hydration in a low-cost and noninvasive way. What started as a simple idea gradually evolved into a much larger exploration of wearable biosensors, biomedical engineering, physiology, and experimental design.

One of the biggest things I learned from this project is that engineering and research are almost never linear processes. Many of my original ideas did not work the way I expected. For example, I initially believed that humidity changes would clearly and quickly reflect dehydration, but through experimentation I learned that humidity often changes much more slowly than expected and is heavily influenced by environmental conditions. I also learned that creating a good experimental model is difficult. My gelatin hydrogel tests were useful for creating controlled conditions, but they behaved very differently from real skin. At first this felt frustrating, but over time I realized that these “failures” were actually some of the most important learning experiences in the project because they forced me to rethink my assumptions and improve my methods.

I also gained a much stronger appreciation for how much testing and refinement real biomedical devices require before they become practical for everyday use. Through my self-testing experiments, I was able to observe reproducible trends where skin humidity decreased during dehydration and increased after rehydration. Even though the system is still only a proof of concept, seeing the sensors respond to real physiological changes was one of the most rewarding moments of the entire project. It showed me that the core idea behind the device has potential, even if it still needs significant improvement.

If I were to continue this project in the future, there are many things I would want to refine. I would like to incorporate more advanced sensors, improve calibration methods for different users and environments, and collect larger amounts of data to better validate the system. I also think machine learning could eventually help identify more accurate dehydration patterns by analyzing multiple signals at once instead of relying on simple thresholds. Additionally, the physical patch itself could become smaller, more comfortable, and more wearable for long-term use.

Overall, this project taught me much more than just how to build a circuit or write Arduino code. It taught me how to troubleshoot problems, adapt when experiments fail, analyze research literature, and think critically about how biomedical technology can impact real people. Most importantly, it showed me how challenging (but also rewarding) the engineering design process can be. Even though this project is ending, I feel like it has given me a much stronger foundation for future work in biomedical engineering and wearable health technology.