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How to build a basic OLED clock with DS3231 RTC (no Wi-Fi needed)
What you'll build: a desk clock that keeps accurate time with a coin-cell backup, displays HH:MM:SS + date on a crisp OLED, and stays accurate to better than 1 minute per year. No internet, no setup app, no apps to update. Parts list: • Arduino Nano • 0.96" SSD1306 OLED display…
