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atmega328p-nano

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Firmware development for the Arduino Nano (A000005, ATmega328P @ 16 MHz, 5 V) — its 30 KB usable flash, 2 KB SRAM, 1 KB EEPROM, 8-channel 10-bit ADC, six 8-bit PWM pins across three timers, UART shared with the USB-serial chip, I2C on A4/A5, SPI on D10–D13, sleep modes, and the Arduino AVR core + PlatformIO setup around them. Use when working on this board or any ATmega328P Nano clone (FTDI or CH340 USB): project setup, platformio.ini, old-vs-new bootloader uploads, pin mapping, A6/A7 restrictions, timer/Servo/tone conflicts, the 2 KB SRAM budget, analog references, powering from VIN, ICSP recovery, or debugging why something on the board does not work.

skills/avr/atmega328p-nano/SKILL.md

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Oct 30, 2026
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# Arduino Nano (ATmega328P)

Board-specific firmware knowledge. The Nano is simple enough that every
failure mode is silent — the sketch compiles, uploads, runs, and does
something subtly wrong — so read the reference file rather than guessing.

- `reference/board-hardware.md` — the complete board reference: corrected pin
  map (the official manual's own tables contain errors), power tree, clock,
  memory map, connector/LED inventory **plus** a development guide (Part II:
  §8 toolchain, §10 peripheral cookbook, §11 gotchas, §12 flashing, §13
  symptom → cause → fix table).
- `reference/recipes.md` — copy-paste code: `platformio.ini`, `board.h`,
  non-blocking timing, serial + free RAM, EEPROM with update semantics, ADC
  and references, interrupts, the timer/PWM map, Servo vs `tone()`,
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