SparkFun SGP40 SHTC3 STC31 MicroMod Environmental Function Board

The SEN-18632 board incorporates three sensors to monitor air quality SGP40, humidity & temperature SHTC3, and CO2 concentrations STC31 in your indoor environment. With M.2 MicroMod connector no soldering is required to connect to the main board.

• Input voltage range

  • 2.5V to 6.0V
    • Typ. 5V via Main Board's USB connector
    • Typ. ~3.7V to 4.2V via Main Board's LiPo battery Connector
• I/O voltage

  • 3.3V
• AP2112 3.3V voltage regulator (rated 600mA)
• Power LED
• I2C pull-up resistors
• Sensirion SGP40 Air Quality Sensor

  • Uses I2C interface
    • Address: 0x59 (default)
  • Operating voltage range
    • 1.7V to 3.6V (Typ. 3.3V)
  • Operating temperature range
    • -20C to +55C
  • Typical current consumption
    • 2.6mA during continuous operation (at 3.3V)
    • 34uA when idle (heater off)
  • Output signal
    • Digital raw value (SRAW): 0 - 65535 ticks
    • Digital processed value (VOC Index): 0 - 500 VOC index points
  • Switch-on behavior
    • Time until reliably detecting VOC events: <60s
    • Time until specifications are met: <1h
  • Recommended sampling interval
    • VOC Index: 1s
    • SRAW: 0.5s - 10s (Typ. 1s)
• Sensirion SHTC3 Humidity and Temperature Sensor

  • Uses I2C interface
    • Address: 0x70 (default, non-configurable)
  • Operating voltage range
    • 1.62V - 3.6V (Typ. 3.3V)
  • Operating temperature range
    • -40C to +125 C
  • Relative Humidity
    • Measurement range: 0% to 100%
    • Typical accuracy: +-2 %RH
    • Resolution: 0.01 %RH
  • Temperature
    • Measurement range: -40C to +125 C
    • Typical accuracy: +-0.2 C
    • Resolution: 0.01 C
  • Typical current consumption (varies based on mode)
    • 4.9uA to 430uA (Normal Mode)
    • 0.5uA to 270uA (Low Power Mode)
  • Allows the STC31 to compensate for humidity and temperature
• Sensirion STC31 CO2 Sensor

  • Uses I2C interface
    • Addresses: 0x29 (default), 0x2A, 0x2B, 0x2C
  • Operating voltage range
    • 2.7V to 5.5V (Typ. 3.3V)
  • Operating temperature range
    • -20 C to +85 C
  • Calibrated for CO2 in N2 and CO2 in air
  • Measurement ranges
    • 0 to 25 vol% in N2
    • 0 to 100 vol% in air
  • Accuracy
    • 0.5 vol% + 3% measured value in N2
    • 1 vol% + 3% measured value in air
  • Concentration and temperature resolution: 16-bit
  • Repeatability: 0.2 vol%
  • Temperature stability: 0.025 vol% / C
  • Start-up time: 14 ms
  • Thermal conductivity sensor provides calibrated gas concentration and temperature output
• Jumpers
  • PWR LED
  • I2C pull-up resistors
  • STC31 address selection

• Schematic
• Eagle Files
• Board Dimensions
• Hookup Guide
• SGP40

  • SGP40 Datasheet
  • VOC Index for Experts
  • SGP40 Design In Guide
  • SGP40 Quick Testing Guide
• SHTC3

  • SHTC3 Datasheet
• STC3X

  • STC31 Datasheet
  • STC Field Calibration Guide
  • STC Design-In Guide
• Arduino Libraries

  • SGP40
  • SHTC3
  • STC3X
• GitHub Hardware Repo

FAQs:

Q: What sensors are included on this board?

A: The board includes three sensors: the SGP40 for air quality, the SHTC3 for humidity and temperature, and the STC31 for CO2 concentration.

Q: How does the board communicate with other devices?

A: The board communicates with other devices over the MicroMod's I2C bus, making it easy to integrate into your existing system.

Q: What is the voltage range for the board?

A: The input voltage range for the board is 2.5V to 6.0V. It typically receives 5V via the MicroMod Main Board's USB connector or 3.7V to 4.2V via the LiPo battery connector.

Q: What kind of projects is this board suitable for?

A: The board is ideal for indoor environmental monitoring projects. It can be used to monitor air quality, humidity, temperature, and CO2 levels in homes, offices, or other enclosed spaces.

Q: Do I need any additional components to use this board?

A: You will need a MicroMod Main Board and a Processor Board to use this Environmental Function Board. These are not included and need to be purchased separately.