TDMA-Based LoRa IoT Architecture with FreeRTOS for Real-Time Multi-Node Bridge Structural Health Monitoring.

Monitoring the health of bridges and other civil structures needs sensor nodes that are reliable, low‑power, and able to send data in real time. Conventional wireless sensor networks often run into packet collisions and unpredictable delays when many nodes are added. This project shows how to build a multi‑node bridge monitoring system that uses a Time‑Division Multiple Access (TDMA) protocol on a Long Range (LoRa) radio link. Each node runs FreeRTOS on its microcontroller, which gives precise task scheduling, fixed‑interval sensor sampling, and collision‑free transmission. The design links several nodes—each with an accelerometer and a strain gauge—to a central gateway. The TDMA schedule stops the nodes from talking over each

other, so packet delivery stays high and latency stays predictable. The guide helps students put together the hardware and software, set up the real‑time operating system tasks, and sync the TDMA frames. The end result is a robust, scalable, and energy‑efficient way to continuously monitor key bridge parameters, useful as a hands‑on reference for IoT‑based industrial instrumentation.

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