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oshparkoshpark wrote 08/06/2017 at 19:13 • 3 min read • Like

@Kris Winer designed this is a small 4-layer PCB for remote logging of absolute position and orientation:

3029441499292022189.jpg

Asset Tracker

STM32L433-based board with CAM M8Q concurrent GNSS, EM7180 + MPU9250 + MS5637 for absolute orientation, and an ESP8285 for wifi connectivity.

https://hackaday.io/project/25790-asset-tracker https://hackaday.io/project/25790-asset-tracker

The board uses an STM32L433 Cortex M4F host programmable via the USB connector using the Arduino IDE and an Arduino core created by Thomas Roell . The absolute position engine is a UBLOX CAM M8Q concurrent GNSS module connected to the STM32L433 via UART. The CAM M8Q uses a chip antenna so no external wire or patch antenna is required resulting in a very convenient device package. The pcb is an integral part of the CAM M8Q antenna and the pcb has been sized to meet the minimum ground-plane size recommendations (20 mm x 45 mm).

https://hackaday.io/project/25790-asset-tracker https://hackaday.io/project/25790-asset-tracker

The absolute orientation engine uses the MPU9250 accel/gyro/magnetometer IMU sensor plus the MS5637 barometer as slaves to an EM7180 motion co-processor that sends quaternions and drift-stabilized altitude to the host via I2C.

https://hackaday.io/project/25790-asset-tracker https://hackaday.io/project/25790-asset-tracker https://hackaday.io/project/25790-asset-tracker

There is an Arduino library and sketch available on GitHub:

kriswiner/AssetTracker



PeskyProducts has shared the board on OSH Park:

AssetTracker.v02c

a12067ff0680dc9f13a9933a8bb07507

Order from OSH Park

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