DS3231-based alarm clock

I present concepts for a DS3231-based alarm clock. The alarm clock is controlled with only two buttons and a slide switch. I use the Nokia 5110 and the DOGS164 as energy-saving displays.

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Watchdog Timer

Here you will learn: What is a watchdog timer? How to use it on Arduino (UNO) and AVR MCUs? What to consider using the watchdog timer on the ESP8266 and Arduino Pro Mini.

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