Two sensor, the 9 axis IMU ICM20948 and barometric pressure sensor BMP581 need to be connected. Both are communicating through SPI. The board contains a 1.8V voltage buck to power the IMU.
Attach color coded wires to the IO pads. E.g. red for power, black or green for ground and blue or white for digital input/output and yellow for analog wires.
You can insert the wires into the holes (perpendicular) or or you can attach a short piece of the wires on top of the pad (perpendicular).
Suggested connections for the Sparkfun Thing Plus (USB-C) and the Adafruit Feather ESP32-S3 are given below.
| PAD | Function | Thing Plus | Feather |
|---|---|---|---|
| INT5 | BMP 581 Interrupt | 12 GIPO12 | 12 GPIO12 |
| CS5 | BMP 581 Chip Select | 08 GPIO15 | 6 |
| SDO | SPI PO | POCI GPIO19 | MI |
| SDI | SPI PI | PICO GPIO23 | MO |
| SCL | SPI SCL | SCK GPIO18 | SCK |
| CS2 | ICM 20948 Chip Select | 10 GPIO33 | 11 GPIO11 |
| INT2 | ICM 20948 Interrupt | 11 GPIO27 | 13 GPIO13 |
| VCC | Power | 3V3 | 3V3 |
| GND | Power | GND | GND |
Require connections are in bold.
It is important to measure each channels resistors on the PCB to achieve maximum accuracy before placing the solder bridges. You will need those values for your software.
