Specification v2

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
  • Designed to optionally fit into a Waterproof Clear Cover Enclosure, available separately.