The original Arduino Nano is a classic, but it’s showing its age. Between its 32KB Flash limit, 2KB RAM, and a power-hungry 15mA sleep current, it’s nearly impossible to use for modern, long-term IoT sensor nodes or advanced battery-powered projects.

I designed the Green Pill Nano to be the ultimate upgrade. It maintains the familiar Pin-Compatible footprint but introduces massive performance leaps:

  - True Ultra-Low Power: Achieves a 1μA sleep current, allowing it to run for years on a single coin cell or ambient light.

  - Pro Performance: 10x more RAM and 4x more Flash than the standard Nano.

  - Real Debugging: Integrated SWD support, moving beyond the "Serial.println()" guessing game to real-time hardware debugging.

  - Built to Last: Features a modern USB-C connector and full hardware protection (ESD, EMI, Overcurrent, and Reverse Polarity).

The Green Pill Nano isn't just a dev board; it’s a high-efficiency engine for the next generation of "set-and-forget" battery-powered devices.

This is an independent project designed for compatibility with the Arduino Nano ecosystem.

IMPORTANT SAFETY & LEGAL NOTICE

1. "As-Is" Warranty This project is provided "as-is" and for educational/hobbyist purposes only. I make no representations or warranties of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, or completeness of the design files, firmware, or documentation.

2. Assumption of Risk The assembly and use of this board are done at your own risk. While this is a low-power design, electronics projects involve hazards including, but not limited to, short circuits, component overheating, or damage to connected hardware (such as sensors or computers). The author shall not be held liable for any property damage, personal injury, or financial loss resulting from the use of these files.

3. No Suitability for Critical Use This design is not intended for use in medical, life-saving, life-sustaining, or any other application where a failure could result in injury or death. It is not a consumer product and has not undergone regulatory testing (such as FCC, CE, or UL).

4. Support and Revisions This is a personal hobby project. While I have made every effort to ensure the design works, I cannot provide technical support, troubleshooting, or customization services for individual builds. Please verify all Footprints and the Bill of Materials (BOM) against the current component datasheets before ordering parts.

5. Licensing Unless otherwise stated, this project is shared under the CC-BY-NC (Creative Commons Attribution-NonCommercial) license. To view a copy of this license, visit: http://creativecommons.org/licenses/by-nc/4.0/