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Schematics.md

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Schematics

  • SPS30 sensor is connected to the UART2 port of the Lolin32-lite board.
    • VCC pin of the sensor is connected to the +5V output of the step-up converter
    • RX pin of the sensor is connected to the IO27 pin of the board
    • TX pin of the sensor is connected to the IO26 pin of the board
    • SEL pin of the sensor is not connected
    • GND pin of the sensor is connected to the GND pin of the board
  • BME280 module is connected to the I2C port of the Lolin32-lite board
    • SDA pin of the sensor is connected to the IO33 pin of the board
    • SCL pin of the sensor is connected to the IO32 pin of the board
    • GND pin of the sensor is connected to the GND pin of the board
    • VCC pin of the sensor is connected to the 3V3 pin of the board
  • Pololu 2810 switch is mounted under the main board and handled by pass-through pins:
    • GND connected to the GND pin of the board
    • Enable pin connected to the IO12 pin of the Lolin32-lite board (next to the GND pin)
    • VIN pin connected to the battery+ of the Lolin32-lite board
    • VOUT pin connected to the + input of the step-up converter. Addtionally, it's connected to voltage divider (R1=220k, R2=330k) and the output of the divider is connected to the IO2 pin of the board. This pin is used to measure the battery voltage.
  • step-up converter's is fixed into separated place on the frame
    • + input is connected to the VBAT pin of the Lolin32-lite board
    • - input is connected to the GND pin of the Lolin32-lite board
    • + output is connected to the VCC pin of the SPS30 sensor.

Scematics

external sensor cover

external sensor frame

The assembled device:

The side view: The top view: The connectors' side view: