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- STM32WLE5CCU6 - NFC (unsupported): NXP NT3H2211W0FTTJ (NTAG I2C plus: NFC Forum T2T with I2C interface, password protection and energy harvesting) - Sensor (unsupported): Analog ADuCM355 (SHTC3 is connected to ADuCM355 and not directly accessible) - Bicolor LED - User button (presently not functional in STM32 variants) The definitions for sensor voltage control are present but commented out to save power, due to lack of sensor support. Powered by 4x 4000mAh RAMWAY ER18505 Li-SOCl2 batteries. Flashing: 1. Power down device (remove batteries) 2. Connect USB-UART to J1 (USART2), pinout is below, do not connect +3V3 pin yet 3. Short BOOT pins next to J1 4. Connect +3V3 pin or insert batteries while BOOT pins are shorted 5. Use STM32CubeProgrammer, connect by UART mode 6. Load firmware .hex and download J1 (USART2); Molex Picoblade (P=1.25mm * 4) 1. +3V3 2. PA3_USART2_RX_J1 3. PA2_USART2_TX_J1 4. GND Signed-off-by: Andrew Yong <me@ndoo.sg> Co-authored-by: Ben Meadors <benmmeadors@gmail.com>