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I built a $15 ESP32 smart clock that does things no store-bought one can

I programmed it with ESPHome, and it only took a few hours from start to finish.
EDN

8X8 LED Matrix Using Arduino Microcontroller

The circuit is driven by a MAX7219 IC that is being controlled through an Arduino microcontroller board, to create an 8X8 LED matrix. The connection of the LED matrix and the IC was done on a ...