A 24-bar bi-colour (red/green) LED bargraph kit with an I²C backpack controller. The backpack handles all LED multiplexing and drive, letting you control 48 LEDs (24 bars × 2 colours) from just two I²C pins. Constant-current drivers ensure bright, consistent colour across all segments with 1/16-step dimming control.

Address-selection jumpers allow up to eight bargraph backpacks on a single I²C bus, and they can be mixed with other compatible I²C LED backpacks (8×8 matrix, 7-segment, etc.).

Key Features

• 24-Bar Bi-Colour Display – Red, green, and yellow (both on) per bar
• I²C Interface – Control all 48 LEDs from just two data pins
• Constant-Current Drivers – Consistent brightness without external resistors
• 1/16-Step Dimming – Software-adjustable brightness
• Address Selectable – Up to 8 backpacks on one I²C bus
• Built-In Clock – On-chip multiplexing, no additional timing circuitry needed

Ideal For

• Audio level meters and VU displays
• Sensor data visualisation
• Status indicators and progress bars
• Arduino, Raspberry Pi, and microcontroller projects

Package Contents

• 1× I²C LED Backpack (assembled and tested)
• 2× 12-Bar Bi-Colour LED Bargraph Modules
• 1× 4-Pin Header

Resources

• LED Backpack Tutorial
• Arduino Library (GitHub)