Environmental sensor - hat for Raspberry Pi - Waveshare 20471

Environmental sensor overlay for Raspberry Pi equipped with a range of useful sensors. It has a built-in sensor for temperature, humidity, air pressure, ambient light for measuring infrared and visible light, a 9 DoF motion sensor, a sensor for measuring UV rays, and a VOC sensor for detecting volatile organic compounds in the environment. The overlay uses the I2C bus for communication. It is powered by a voltage of 5 V.

• Environmental sensor - overlay for Raspberry Pi - Waveshare 20471 - 1 piece
• Female header 2x20 pin - 2.54 mm pitch - 1 piece
• Goldpin strip 1x4 pin - 2.54 mm raster - 1 piece
• Set of screws and spacers to connect to Raspberry Pi
  • Male to female spacer - 2 pieces
  • mounting screws - 3 pieces
  • washers - 3 pieces

Kit contents.

The overlay has pinouts that match the GPIO connector layout on the Raspberry Pi.

• Pinouts are compatible with Raspberry Pi GPIO pinouts
• Built-in TSL25911FN digital ambient light sensor, to measure infrared and visible light
• Built-in BME280 sensor, to measure temperature, humidity and pressure
• Embedded ICM20948 motion sensor - 3-axis accelerometer, 3-axis gyroscope and 3-axis magnetometer
• Embedded LTR390-UV-1 UV sensor
• Embedded SGP40 sensor for ambient VOC detection
• Communication via I2C interface
• Manufacturer provides examples and programming resources (examples for Raspberry Pi / Arduino / STM32)

1. GPIO pinouts compatible with Raspberry Pi
2. TSL25911FN digital ambient light sensor, for infrared and visible light measurements
3. UV sensor LTR390-UV-1
4. SGP40 VOC sensor
5. ICM20948 - 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer
6. BME280 Temperature, humidity and air pressure sensor
7. Logic level converter from 3.3 V to 1.8 V
8. Voltage regulator 5 V to 3.3 V / 1.8 V

Arrangement of the components on the overlay.

Leads of the overlay.

• 5 V - power pin
• GND - system ground
• SDA - I2C bus data line
• SCL - I2C bus clock line

• Embedded chip: BME280
• I2C interface address: 0x76
• Temperature measurement:
  • range: from -40°C to 85°C
  • resolution: 0.01°C
  • accuracy: ± 1°C
• Humidity measurement:
  • range: from 0% to 100% RH
  • resolution: 0.008% RH
  • accuracy: ± 3% RH
  • response time: 1 s
  • delay: ≤ 2% RH
• Pressure measurement:
  • range: from 300 hPa to 1100 hPa
  • resolution: 0.18 Pa
  • accuracy: ± 1 hPa

• Application: for Raspberry Pi
• Built-in sensors:
  • digital ambient light sensor
  • sensor for measuring temperature, humidity and air pressure
  • motion sensor - 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer
  • UV radiation sensor
  • sensor for the detection of volatile organic compounds in the environment
• Communication interface: I2C bus
• Board dimensions: 65 x 30 mm

• Integrated circuit: TSL25911FN
• I2C interface address: 0x29
• Range: 0 lx to 88000 lx

The cap has 4 mounting holes.

• Purpose: to detect volatile organic compounds in the environment
• Embedded circuitry: SGP40
• I2C interface address: 0x59
• Measurement scale: from 0 ppm to 1000 ppm
• VOC index value: 0 to 500
  • from 0 to 100 - air quality: excellent
  • 100 to 200 - air quality: good
  • 200 to 300 - air quality: slightly polluted
  • 300 to 400 - air quality: medium pollution
  • 400 to 500 - air quality: very dirty

• Integrated circuit: ICM20948
• Number of degrees of freedom: 9 DoF
• Number of measurement axes: 3 (X, Y, Z)
• I2C interface address: 0x68
• Resolution: 16 bit
• Accelerometer:
  • measurement: acceleration
  • range: ± 2, ± 4, ± 8, ± 16 g (configurable)
• Gyroscope:
  • measurement: angular velocity
  • range: ± 250, ± 500, ± 1000, ± 2000 °/s (configurable)
• Magnetometer:
  • measurement: magnetic field
  • range: ± 4900 µT

• Embedded circuit: LTR390-UV-1
• I2C interface address: 0x53
• Wavelength: 280 nm to 430 nm

Environmental sensor - overlay for Raspberry Pi - Waveshare 20471.

• Manufacturer's website: Waveshare 20471
• Product Wiki page
• BME280 technical documentation
• Technical Documentation TSL2591
• Technical Documentation LRT-390UV-01
• Documentation ICM-20948 Technical Documentation
• Technical Documentation SGP40