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# Subsystems
## Power Input
USB Micro-B power entry with polyfuse protection and bulk storage. Data pins unused: this node powers from USB but talks over the FTDI header.
## Regulation
AMS1117-3.3 linear regulator dropping the fused 5V bus to the 3.3V rail, with input and output ceramics.
## MCU
ATmega328P (TQFP-32) with supply decoupling, AREF filtering, the reset pull-up shared with the ISP header, and the supply-sense divider into ADC6.
## Clock
16MHz crystal with its two load capacitors.
## IO Headers
I2C header with bus pull-ups, FTDI serial header, and the 2x3 ISP programming header.
## Status
Always-on 3.3V rail indicator LED with its series resistor.