“I’ve built a digital clock made out of 144 seven-segment displays controlled by an Arduino Nano. The segments are controlled by 18 MAX7219 ICs which can control up to 64 individual LEDs or 8 ...

Posted in clock hacks, LED Hacks Tagged ATmega 328, clock, countdown timer, MAX7219, seven segment LED UV Phone Sanitizer Shows The Power Of Modern DIY June 8, 2020 by Tom Nardi 94 Comments ...

The clock’s brain is an ATmega328 running Arduino. The controller keeps accurate time using a DCF77 receiver module and a DCF77 Arduino library . The clock comes with three display modes.

Here is a simple, yet useful circuit of an Arduino 4-digit 7-segment LED display unit. The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric ...