# CO2 Gadget — Advanced Air Quality Monitor with Companion App

> An advanced CO2 monitoring firmware for ESP32 display boards with BLE/WiFi/MQTT/ESP-Now connectivity, real-time Android/iOS companion app for charting, and support for SCD4x, SCD30, and MH-Z19 sensors.

## Details

- **Difficulty:** beginner
- **Project Type:** build
- **Board Types:** ESP32-S3, ESP32
- **Devices:** lilygo-t-display-s3, lilygo-t-display
- **Firmware:** Arduino, PlatformIO, MQTT
- **Use Cases:** Environmental Monitoring, Display & Dashboard, Home Automation, Data Logging
- **Links:** Github Url: https://github.com/melkati/CO2-Gadget

## Tags

`co2`, `air-quality`, `scd41`, `scd30`, `environmental`, `monitoring`, `companion-app`, `mqtt`, `ble`, `t-display`

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