Michael Manning has open-sourced Weathergotchi, a delightful little climate logger that continuously records temperature and humidity, then displays both current readings and historical trends on an e-paper screen. What makes it special is the power efficiency—the device runs for over a week on a single small battery, making it ideal for ambient deployments. The full project is available on GitHub for anyone wanting to build their own. According to the Adafruit Blog, it's a perfect example of thoughtful maker design.

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