I built a DIY air quality monitor to track what I’m breathing at home. It measures CO₂, VOCs, particulate matter, temperature, and humidity with high-quality sensors, all shown on a compact e-paper display. Indoor air quality affects sleep, focus, and health, so I designed this open-source device with a custom PCB, ESP32 firmware, and a 3D-printed enclosure. 📂 Build Your Own: ✅ Custom PCBWay Order (Fixed/Updated) → [ ] ✅ GitHub Repo (KiCad/Firmware/3D Models) → [ ] 🛠 Parts & Supplies (Prototyping): ESP32 Dev Board (Affiliate Link) → [ ] Breadboard + Jumper Wire Kit (Affiliate Link) → [ ] SCD41 CO₂ Sensor (Affiliate Link) → [ ] SEN54 VOC/PM Sensor → [ ] 3.7" E-Paper Display → [ ] Using affiliate links helps support the channel at no extra cost to you. 🙏 Thanks to PCBWay for sponsoring this project and making the manufacturing process smooth and quick.