Specification

AQIX Specification and Features

• Sensors Included
  • High Accuracy CO2 Sensor
    • SCD40 ±50 ppm + 5% of reading @400-2000 ppm
    • Optional SCD41 ±40 ppm + 5% of reading @400-5000 ppm
  • High Accuracy Barometric Sensor - Bosch BME 280 Module, providing: - Barometric Pressure 300...1100 hPa (millibar) - Accuracy ±0.25% - which is equivalent to 1m at 400m height change - RMS Noise 0.2 Pa - which is equivalent to 1.7 cm - Temperature -40 to 85°C - Temperature coefficient offset ±1.5Pa/K. - which is equivalent to ±12.6cm at 1 °C temperature change - Humidity - 0 to 100 % - Accuracy tolerance ±3% relative humidity - Hysteresis ≤2% relative humidity
  • Ambient Light Sensor
    • SFH2440, providing spectral sensitivity adapted to human eye sensitivity
    • Std. Light A; T = 2856 K Minimum 7 nA/lx
    • Spectral range of sensitivity λ10% typically 400 to 690 nm
    • Wavelength of max sensitivity λS max typically 620 nm
• MCU
  • Espressif ESP32-C3 Mini - 2.4GHz Wi-Fi (802.11b/g/n) and Bluetooth 5
    • ESP32-C3-MINI-1-N4 (PCB Antenna)
    • ESP32-C3-MINI-1U-N4 (External Antenna via U. FL cable)
    • On-Board 32.768 kHz XTAL for Real Time Clock
• Type C Programming / Debug
  • Type C USB Connector
  • CH340K USB UART 2Mbps Transceiver
  • Easy programming. Select ‘ESP32C3 Dev Module’
  • BAUD rate up to 921600 to speed up Flashing
  • Serial Monitoring Debug and Remote Logging
  • Power Can Be Taken from USB 5V (when Flashing).
• EEPROM (I2C)
  • AT24C64 64Kbit
  • On-board Data Logging
  • On-board Parameters
  • Firmware setup user parameters and configuration
• Battery or External DC Operation
  • Powered by:
    • 1 x CR123 Lithium battery
    • External DC such as USB 5V or 4.5 to 15V DC
• Battery Voltage Monitor
  • ADC provides battery voltage reading
• External DC Input
  • AMS1117 LDO allowing use of external DC input 4.5V to 15V
• External Temperature
  • Dallas OneWire Interface for External Temperatures
    • Example Probe Sensor for Greenhouse
• RGB LED - Status
  • Configured to three GPIO’s for easy Firmware control
• I2C OLED Connector
  • Configurable 3V3 Pin 1 and 2 polarities
  • PCB 4 Pin Header Connector
• Buttons
  • Reset
  • User (Program or GP9 Detect)
• Enclosure
  • Designed to fit into a Waterproof Clear Cover Enclosure
• Compact Design and Easy to Use
  • Compact PCB 63mm x 51mm
  • 4 x M3 mounting holes
  • Operating Ambient Temperature -10 to +60 °C
  • Optional Conformal Coating – on request.

Further Information

Additional information, and other technical details on this project, maybe found in the related repository pages.

Repository Folders

• Code (Code examples for Arduino IDE and PlatformIO)
• Datasheets and Information (Component Datasheets, Schematics, Board Layouts, Photos, Technical Documentation)
• Certification (Related Repository Project or Part, Certification Information)

Repository Tabs

• Wiki (Related Repository Wiki pages and Technical User Information)
• Discussions (Related Repository User Discussion Forum)
• Issues (Related Repository Technical Issues and Fixes)

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Dave Williams, Maidstone, UK.

Electronics Engineer | Software Developer | R&D Support | RF Engineering | Product Certification and Testing | STEM Ambassador

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