IMU

[036] IMU DATA LOGGER FOR MOTION ANALYSIS

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The idea here was to capture motion data in real operating conditions — vibrations, orientation changes, transient events — without depending on a permanent network connection.

The system is built around an ESP32-S3, chosen for its processing power and built-in Wi-Fi. The IMU samples continuously, data gets timestamped, and it’s stored either on a microSD card for long sessions or transferred directly over Wi-Fi for quick access.

Both modes coexist, which gives real flexibility: leave the device running in the field without a network and retrieve the data later, or tap into live measurements if you’re within range. Compact, autonomous, and actually useful on a real job site.

[013] EMBEDDED 4G TRACKING DEVICE

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GPS, 9-axis IMU, 4G modem with 2G fallback, BLE, Li-Ion battery — all on one compact platform built around an STM32L152.

4G is the primary communication path, with 2G taking over if coverage degrades. BLE provides a local interaction layer through a smartphone — configuration and status access without going through the cellular network. The IMU adds motion awareness on top of positioning: not just where the device is, but how it’s moving.

In a product like this, energy management is its own engineering challenge. The cellular modem, GNSS receiver, and IMU all have very different power profiles, and the whole thing has to run on battery in unpredictable field conditions. A real system architecture problem from start to finish.