🌱 M5Stack CO2 Unit is a compact, digital air quality sensor module designed for precise CO₂ concentration detection. It features Sensirion's high-performance SCD40 sensor and a built-in DC-DC step-down circuit, communicating via I2C protocol. Ideal for environmental monitoring, it offers typical accuracy of ± (50 ppm + 5% of reading) within a range of 400 ppm ~ 2000 ppm, and also measures ambient temperature 🌡️ and humidity 💧.
✨ Features
- 📊 CO2 concentration detection
- 🌡️ Temperature and humidity measurement
- 🔗 I2C communication (0x62)
- ⚡ Integrated 5V → 3.3V DC-DC converter
- 🧩 2 x LEGO-compatible mounting holes
- 🔌 HY2.0 4P interface
🌍 Applications
- 🏭 Indoor CO2 level monitoring
- 🌡️ Temperature and humidity tracking
📐 Specifications
| Specification | Parameter |
|---|---|
| CO2 Measurement Range | 400 ~ 2000 ppm |
| CO2 Sampling Accuracy | ± (50 ppm + 5% of reading) |
| Temperature Range | -10 ~ 60 °C |
| Humidity Range | 0 ~ 95 %RH |
| Communication Protocol | I2C:0x62 |
| Enclosure Material | Plastic (PC) |
| Product Size | 48.0 x 24.0 x 16.0mm |
| Product Weight | 7.6g |
| Package Size | 138.0 x 93.0 x 17.0mm |
| Gross Weight | 13.0g |
📄 Schematics
🔌 PinMap
Unit CO2
| HY2.0-4P | Black | Red | Yellow | White |
|---|---|---|---|---|
| PORT.A | GND | 5V | SDA | SCL |
📏 Model Size
📑 Datasheets
💻 Software & Examples
Arduino
- Unit CO2 with M5Atom
- Unit CO2 with M5AtomS3
- Unit CO2 with M5AtomS3Lite
- Unit CO2 with M5Core
- Unit CO2 with M5Core2
- Unit CO2 with M5StickC
- Unit CO2 with M5StickCPlus
UiFlow1
UiFlow2
📦 Includes
- 1 × Unit CO2
- 1 × HY2.0 connection cable (20CM)