This Bi-Colour LED Bargraph gives you a compact, breadboard-friendly way to add red, green, yellow, or mixed-colour linear indicators to your project.
Make a small linear display with multiple colours using this elegant bi-colour LED bargraph. Only 1.2" long, it is quite visible but not so large it wont plug into a breadboard! 24 LEDs are contained in the plastic body, 12 red 14mcd and 12 13mcd green. Every bar has two LEDs inside so you can have it display red, green, yellow or with fast multiplexing any colour in between.
This display is bright, beautiful and funky with nice diffused rectangular lenses for a striking look. There are 14 pins, 7 on each side, with 0.1"spacing so you can easily plug it into a breadboard with plenty of space for wiring left over.
Since the display is multiplexed we suggest using 3 NPN transistors to drive the cathodes with microcontroller pins and then a 74HC595 to drive the 8 anodes.
There is a playground article about bargraph displays but that one is for non-multiplexed displays. You should also check out the tutorials introducing matrices for ideas on how to drive a multiplexed bargraph.
Features
Bi-colour LED bargraph display with 24 total LEDs (12 red 14mcd, 12 green 13mcd)
Compact 1.2" length fits easily into breadboards
Dual LEDs per bar enabling red, green, yellow and intermediate colours via multiplexing
Bright, diffused rectangular lenses for striking visual appearance
14 pins with 0.1" spacing (7 pins per side)
Multiplexed design requires 3 NPN transistors for cathode driving and 74HC595 shift register for anode control
