Main components

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Part NumberDescription
STM32F401C_B-C_UxSTMicroelectronics Arm Cortex-M4 MCU, 128-256KB flash, 64KB RAM, 84 MHz, 1.7-3.6V, 36 GPIO, UFQFPN48
SN74LVC2G04

l3 schematic

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l3 board layout

l3 PCB render

Top PCB
Bottom PCB