Skip to content

#Specification CWX-2

CWX v2 specification overview:

  • Bosch BME 280 Module
    • 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
  • SFH2440 Ambient Light Sensor
    • Light Level Spectral 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
  • Battery Voltage Monitor
    •  ADC switching provides a separate battery voltage reading
  • Powered by:
    • 1 x CR123 Lithium battery
    • External DC such as USB 5V
  • Connections
    • USB (CH340)
    • I2C (expansion)
  • Display
    • An optional OLED display can be connected to the I2C header
  • Enclosure