Hey everyone! I wanted to share an exciting DIY project I recently completed. I’ve always been passionate about sustainability and repurposing materials, so when I stumbled upon an old pneumatic tube at my partner’s workplace, I knew I had to give it a new life. I decided to transform this retired medical device into an air quality sensor. The challenge was to integrate it with my smart home ecosystem while maintaining its unique aesthetic. Here’s what I did:1. Hardware Setup: The sensor measures CO2, particulate matter (PM1, PM2.5, PM10), temperature, and humidity. I added a 3D-printed cage to improve ventilation and protect the sensors. 2. Software Integration: Using ESPHome on an ESP32, I connected it to my Home Assistant setup. The device also includes fun features like DND mode and Bluetooth detection for personalized alerts when family members arrive home. 3. Challenges and Solutions: One hurdle was ensuring stable power supply. The PM2.5 and CO2 sensors require 5V, which the battery couldn’t provide reliably. I opted for a wired solution instead, sacrificing portability for reliability. 4. Results: The device now provides real-time air quality monitoring, complete with visual feedback and alerts. It’s been a fantastic addition to my smart home setup, and I love how it combines technology with sustainability. This project taught me the importance of creativity in smart home solutions. If anyone has similar upcycling ideas or questions about integrating sensors, I’d love to hear from you! 
