M5Stack Air Quality Kit v1.1 features Sensirion SEN55 environmental sensor and SCD40 CO2 sensor

M5Stack Air Quality Kit v1.1 is an ESP32-S3-based air quality monitor equipped with Sensirion SEN55 and SCD40 sensors capable of monitoring PM1.0, PM2.5, PM4, PM10 particulates, temperature, humidity, VOC, and CO2 concentration in the air.

The first version was introduced in January 2024, but M5Stack just introduced the v1.1 model with Stamp-S3A master control, power consumption optimizations, an improved Wi-Fi antenna design, and a larger button for a “better feel”.

M5Stack Air Quality Kit v1.1 specifications:

• Wireless module – M5Stack StampS3A
  • WiSoC – Espressif Systems ESP32-S3FN8
    • CPU
      • Dual-core 32-bit Xtensa LX7 microcontroller with AI vector instructions up to 240MHz
      • RISC-V ULP co-processor
    • Memory – 512KB SRAM
    • Storage – 8MB flash
    • Wireless – 2.4GHz WiFi 4 (802.11b/g/n), Bluetooth 5.0 LE + Mesh
  • Connectivity
    • 2.4 GHz WiFi 4, 20 MHz and 40 MHz bandwidth, IEEE 802.11 b/g/n protocol, up to 150 Mbps
    • Bluetooth 5, Bluetooth Mesh, with support for 125 Kbps, 500 Kbps, 1 Mbps, 2 Mbps bitrate, long-range support
    • 2.4GHz 3D antenna
  • USB – 1x USB Type-C port for power and programming
• Display – 1.54-inch E-Ink display with 200×200 resolution (GDEY0154D67)
• Sensors
  • Sensirion SEN55 environmental sensor node @ 0x69 I2C address
    • Particulate matter, volatile organic compounds (VOC), oxidizing gases like nitrogen oxides (NOx), humidity, and temperature sensor platform
    • Particulate matter
      • Mass concentration precision: ±10%
      • Mass concentration range: 0 – 1000μg/m³
      • Particle size range: PM1.0, PM2.5, PM4 and PM10
    • VOC
      • Sensor output – 0-500 VOC Index
      • Measurement range – 0 – 1000 ppm (Ethanol equivalent)
      • Response time (τ63%) – < 10s
      • Limit of detection – < 0.05 ppm of ethanol equivalents or < 10 % of concentration setpoint, whichever is larger
    • Temperature
      • Typ. temperature accuracy: 0.45°C
      • Operating temperature range: -10 – 50°C
    • Humidity
      • Typ. relative humidity accuracy: 4.5 %RH
      • Operating relative humidity range: 0 – 90 %RH
  • Sensirion SCD40 CO2 sensor @ 0x62 I2C address
    • CO2 measurements up to 2000 PPM
      • Accuracy: +/- 50 PPM, 5% MV
      • Maximum value up to 40000 PPM
      • Automatic or manual calibration
    • Temperature & humidity
      • Temperature range — -10°C to 60°C
      • Humidity range — 0 to 95% RH
• Expansion – 4-pin Grove interface with 5V input/output switching
• Misc
  • Buttons – Power On, Reset/Power Off, A, and B
  • RTC8563 RTC for timed wake-ups
  • Passive buzzer
  • LEGO mounting holes, magnetic base, and 4 M3 removable mounting lugs
• Power Supply
  • 5V via USB-C port or Grove connector
  • 3.7V/600 mAh battery
• Dimensions – 72.0 x 56.0 x 26.5mm
• Weight – 91.4 grams
• Temperature Range – 0 ~ 40°C

The factory firmware shows sensor data on the E-Ink display and supports uploading air quality data to the M5Stack Ezdata cloud platform for a convenient remote data viewing function. It can also be programmed with UiFlow2 visual programming IDE, the Arduino IDE, PlatformIO, and the ESP-IDF framework. The documentation website has instructions to get started with the Air Quality Kit, a few tutorials, and more technical details.

While it’s the first device we’ve covered with both SEN55 and SCD40 sensors, Sparfun’s “Indoor Air Quality Combo Sensor” comes quite close with SEN55 and SCD41sensors, albeit you’d need a host microcontroller to use it, while the M5Stack device works in standalone mode. If you only need an SCD40 or SCD41 sensor, the MoreSense MS-06 air quality monitor is another ESP32-S3 solution with a color display.

The Air Quality Kit v1.1 can be purchased for $89.90 on AliExpress or M5Stack’s store.

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