Why I built it
Aquarium thermometers have a high margin of error and require constant physical monitoring. That’s a real problem when I’m away from home — I can’t keep track of my aquarium at all. So I designed an ESP32-based, IoT-enabled monitoring system to solve it.

How I solved it

• Track temperature in real time with high-precision sensors
• Log all data to the cloud via ThingSpeak for retrospective analysis
• Access data through various charts and platforms thanks to ThingSpeak’s API support
• Get instant Telegram bot notifications on abnormal temperature changes
• Fine-tune temperature control with an integrated thermostat and cooling system

Result
I achieve a margin of error of just ±0.125°C, and I can monitor and respond to my aquarium in real time from anywhere. No more worrying when I’m away from home.