Adafruit
Bi-Color (Red/Green) 24-Bar Bargraph w/I2C Backpack Kit
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 ...
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
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
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Related Tutorials
Free guides on learn.littlebird.com.au
