The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.

The Arduino-based instrument measures DC voltage, current, power, energy, capacity, and temperature. The range is only up to 26 volts and 3.2 amps, but you could extend that with some external ...

The standard Led Arduino Library (LedControl.h) is used in most of the examples. – Power Supply: Using four 8X8 LED matrices makes a total of 4x8x8=256 LEDs, because of that the current could ...