3 Times We Almost Failed: The Reality of Building Hardware 🛑

Introduction

If you look at the final photos of our "PureDrop" project, it looks neat. The wires are hidden, the display is glowing, and it just works. But honestly, social media is a lie.

What you don't see in those photos is the panic. You don't see the burnt sensors, the code that refused to upload, or the moment we thought we’d have to restart the whole thing.

Engineering isn't just about building; it's mostly about fixing things you broke five minutes ago. I wanted to share the real "behind-the-scenes" of this project—specifically the three times we got stuck and how we eventually figured it out.

1. The "Waterproof" Disaster 💧

When we started, we made a rookie mistake. We were so focused on the code that we forgot about basic physics: Electronics + Hot Oil = Bad Idea.

We initially planned to use a standard temperature sensor. But right before testing, we realized that dipping a bare circuit board into frying oil would basically deep-fry our project. It sounds obvious now, but we genuinely overlooked it.

The Fix: We had to scramble to find a specific component called the DS18B20 Waterproof Probe. It looks like a long metal thermometer and is completely sealed. It saved us from frying the Arduino, but it was a close call.

2. The Ghost in the Machine (Sensor Issues) 

The color sensor (TCS3200) gave us the biggest headache. During our first few tests, the readings were completely random. One minute the oil was "Safe," and ten seconds later it was "Unsafe"—even though we hadn't even touched the oil!

We spent hours checking our code, thinking we messed up the logic.

It turned out the code was fine. The problem was the sunlight. The sensor was so sensitive that it was reading the light from the lab windows instead of the oil. We felt pretty stupid after realizing this. To fix it, we had to build a small "dark shroud" (basically a cover) around the sensor to block outside light. Sometimes the solution isn't better code; it's just a piece of cardboard.

3. The Spaghetti Wiring Nightmare

I’ll be honest, at one point our breadboard looked like a bowl of noodles. We were rushing to connect everything, and it became a chaotic mess of loose wires.

The result? The OLED display would randomly turn off if we even breathed on the table. We wasted nearly 3 hours debugging the software, only to find out it was just a loose Ground wire buried under the mess.

That was the moment we decided to stop being lazy and color-code our wires (Red for Power, Black for Ground). It’s boring work, but it saves so much sanity later on.

Conclusion

If you are working on a project right now and nothing is working—don't worry. That’s just part of the process. We failed multiple times before we got that final "Safe" reading on the screen.

Engineering is 10% building and 90% debugging. Keep going!