G650-04023-01

    Environmental Sensor Board  datasheet  Version 1.1      Features    ● ● ● ● ● ● ● ● ● 128x32 OLED display  Ambient light sensor (OPT3002)  Barometric pressure sensor (BMP280)  Humidity / temperature sensor (HDC2010)  Cryptoprocessor (ATECC608A) with Google keys  40-pin GPIO female connector  Four Grove connectors:  ○ 1x UART  ○ 1x I2C  ○ 1x PWM  ○ 1x 3.3/5V analog  General purpose button  General purpose LED    Description    The Environmental Sensor Board is an add-on board (also known as a pHAT or bonnet) that adds sensing capabilities to  your Coral Dev Board or Raspberry Pi projects. (It includes an EEPROM for compatibility with Raspberry Pi boards.)    The board provides atmospheric data such as light level, barometric pressure, temperature, and humidity. You can also  attach additional sensors with the Grove connectors.    The board also includes a secure cryptoprocessor with Google keys to enable connectivity with Google Cloud IoT Core  services, allowing you to securely connect to the device and then collect, process, and analyze the sensor data.    Ordering information      Part number  Description  G650-04023-01  Coral Environmental Sensor Board         Coral.ai | Copyright 2019 Google LLC.      Environmental Sensor Board datasheet v1.1  G650-04023-01          Table of contents    Features 1  Description 1  Ordering information 1  Table of contents 2  1 Dimensions 3  2 Requirements 3  3 Sensors 4  4 Grove connectors 4  5 OLED display 5  6 Secure cryptoprocessor 5  7 Header pinout 6  8 I2C address reference 7  9 Document revisions 7           Coral.ai | Copyright 2019 Google LLC.    2    Environmental Sensor Board datasheet v1.1  G650-04023-01          1 Dimensions    Table 1. Board mechanical specifications  Measurement  Value  Board size  Board w/ components: 65 x 30 x 18.46 mm  40-pin header height: 8.5 mm  Hole size/spacing  Diameter: 2.4 mm  Horizontal spacing: 58 mm  Vertical spacing: 23 mm  Weight  14 g      Figure 1. Board and mounting hole dimensions (in millimeters)      2 Requirements    The board must be connected to a host with I2C, SPI, and 3.3V power. The 40-pin GPIO header and Python APIs are  designed to work with the Coral Dev Board or Raspberry Pi (running Mendel Linux or Raspberry Pi OS, respectively).    You can install the Environmental Board Python library on the host device as follows:    sudo apt-get install python3-coral-enviro    If using a device other than the Coral Dev Board, you must first add the Coral package repo to your device. For instructions,  see the Coral debian package details.             Coral.ai | Copyright 2019 Google LLC.    3    Environmental Sensor Board datasheet v1.1  G650-04023-01          3 Sensors    All sensors are connected to the I2C lines from header pins 3 and 5 (see the header pinout).    Table 2. Board sensor details  Sensor  Details  Humidity and temperature sensor  Texas Instruments HDC2010:  ● Humidity range/accuracy: 0-100% ± 2% (typical)  ● Temperature range/accuracy: -40 to +125 °C (functional) ± 0.2 °C (typical)  I2C address: 0x40  Ambient light sensor  Texas Instruments OPT3002:  ● Optical spectrum: 300-1000 nm  ● Measurement range: 1.2-10 mW/cm2  I2C address: 0x45  Barometric pressure sensor  Bosch Sensortec BMP280:  ● Operation range: 300-1100 hPa  ● Absolute accuracy (@ 0-65 °C): ~ ± 1 hPa  ● Relative accuracy (@ 700-900 hPa; 25-40 °C): ± 0.12 hPa (typical)  I2C address: 0x76    4 Grove connectors    The Grove connectors provide easy access to the PWM, UART, and I2C pins from the baseboard, plus an on-board  analog-to-digital converter (ADC), as illustrated in figure 2.    To interact with the AIN0 analog source, use address 0x49 on the I2C lines from header pins 3 and 5 (see the header  pinout). For more detail on the analog-to-digital converter, refer to the ADC part specifications (TLA2021IRUGT).    Note: The VDD_A pin on the analog Grove connector can be powered by either the 5V or 3.3V power rail by the jumper  pins indicated in figure 2 as the ANALOG VDD JUMPER.      Figure 2. Pin functions for each Grove connector       Coral.ai | Copyright 2019 Google LLC.    4    Environmental Sensor Board datasheet v1.1  G650-04023-01          5 OLED display    The 128x32 OLED display is driven by the SSD1306 control chip, connected with the SPI interface.    Table 3. OLED display pinout for 40-pin header  SPI function  Pin  MOSI  19  MISO  21  SCLK  23  CL  24  RESET  22  DC  18    6 Secure cryptoprocessor    The board includes a secure cryptoprocessor (ATECC608A) with an EEPROM that can store up to 16 keys (256-bit),  certificates, or other data. Although this chip provides a range of cryptographic features, it is primarily included to provide  secure key generation and management so you can securely authenticate with the device when deployed into the field.    The factory setting for the Environmental Sensor Board includes one Google key (private key, public key, and certificate) to  enable communication with Google Cloud IoT Core right out of the box. This key slot is reusable, just like the rest of the  memory, so you don't have to keep it.             Coral.ai | Copyright 2019 Google LLC.    5    Environmental Sensor Board datasheet v1.1  G650-04023-01          7 Header pinout    Figure 3 shows which pins from the baseboard are used by the Environmental Sensor Board. Pins highlighted in dark green  are used by the board and not available to you (except through software for the corresponding functions), while the pins in  light green are used by the board but are still available to you through the Grove connectors.      Figure 3. Pins used by the board             Coral.ai | Copyright 2019 Google LLC.    6    Environmental Sensor Board datasheet v1.1  G650-04023-01          8 I2C address reference    Table 4. I2C addresses for all on-board devices  Device  Address  Humidity/temp sensor  0x40  Ambient light sensor  0x45  Barometric pressure sensor  0x76  Analog Grove connector  0x49  Cryptoprocessor  0x30    9 Document revisions    Table 5. History of changes to this document  Version  Changes  1.1 (December 2020)  Added ADC part number (TLA2021IRUGT).  Added information about the Python library.  Removed list of certifications (instead see product availability).  Updated document style and added section numbers (datasheet is now in PDF only).  1.0 (March 2019)  Initial release.                 Coral.ai | Copyright 2019 Google LLC.    7