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This is a 4-layer PCB design of a LoRa sensor node based on the STM32WLE5CCU6.
It includes a temperature and humidity sensor (HDC2022) and an RF path to an SMA antenna.
The board was designed in KiCad with focus on a working hardware setup and easy bring-up.
The RF section follows the STM32WL development board schematics and layout guidelines.
STM32WLE5CCU6 with integrated Sub-GHz radio (LoRa).
Combines MCU and RF transceiver in a single chip, reducing external components and simplifying the design.
HDC2022 connected over I²C for temperature and humidity measurement
CR123A lithium battery used as the main power source
Selected for its ability to handle LoRa transmission current peaks and provide reliable long-term operation in a low-duty-cycle system
Estimated battery life is over 2 years, based on power estimation using STM32CubeMX Power Consumption Calculator
SWD interface and UART pins for programming and debugging
MIT
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