Continue reading “An 840 Segment Display” → Posted in LED Hacks Tagged common anode , common cathode , MAX7219 , seven segment , seven segment display Search ...

This chip can easily — and cheaply — control eight common cathode seven segment displays. There’s a problem with this plan, though: the LEDs received from eBay are common anode.

The algorithm uses double multiplexing,driving one digit at a time, segmentby segment. This technique suits battery-powereddesigns because the circuit consumesa constant current of less than 2mA when ...

The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric displays. Each segment in the display module is multiplexed, meaning it shares the same ...