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 ...
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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 (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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adafruit led backpack
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