Product description: Environmental sensor - overlay 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.
Kit contents
- 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.
Product compatible with Raspberry Pi
The manufacturer provides a product wiki page that contains a detailed user guide and useful programming resources.
The overlay has pinouts that match the GPIO connector layout on the Raspberry Pi.
Special features
- 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)
Arrangement of elements on the frontend
- GPIO pinouts compatible with Raspberry Pi
- TSL25911FN digital ambient light sensor, for infrared and visible light measurements
- UV sensor LTR390-UV-1
- SGP40 VOC sensor
- ICM20948 - 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer
- BME280 Temperature, humidity and air pressure sensor
- Logic level converter from 3.3 V to 1.8 V
- Voltage regulator 5 V to 3.3 V / 1.8 V
Arrangement of the components on the overlay.
Leads of the overlay.
Pinout description
- 5 V - power pin
- GND - system ground
- SDA - I2C bus data line
- SCL - I2C bus clock line
Temperature, humidity and air pressure sensor specification
- 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
Technical specifications of the environmental sensor
- 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
Ambient light sensor specification
- Integrated circuit: TSL25911FN
- I2C interface address: 0x29
- Range: 0 lx to 88000 lx
The cap has 4 mounting holes.
Interpretation of VOC index readings.
Specification of VOC sensor
- 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
Motion detector specifications
- 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
UV measurement sensor specifications
- Embedded circuit: LTR390-UV-1
- I2C interface address: 0x53
- Wavelength: 280 nm to 430 nm
Environmental sensor - overlay for Raspberry Pi - Waveshare 20471.
