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 ...

The Arduino fetches the time from a DS1302 RTC module and splits the result up into four-digit time. Code-wise, each digit gets its own array, which stores the active and inactive positions for ...

Using an Arduino per 4-digit segment is such a waste though. Report comment. Reply. Blue Footed Booby says: ... Have a little table of display-module-address, from 1 to 8, say.

For testing purpose only one 330 Ohm resistor (R2) is added between ground rail (0V) and the common cathode pins (3 & 8). It is better to directly connect pins 3 & 8 of the display to ground rail.

The display itself is made up of 144 seven-segment displays. Each of these displays consists of 8 individual LEDs, making a total of 1,008 LEDs in the entire array. To control such a large number ...