Adafruit 1.2 4-Digit 7-Segment Display w/I2C Backpack - Yellow
A great display. Ideal for "across the room" viewing. The I2C backpack makes it a doddle to drive.
John Jull
Adafruit
Adafruit 1.2 4-Digit 7-Segment Display w/I2C Backpack - Yellow
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The Adafruit 1.2" 4-Digit 7-Segment Display with I2C Backpack in yellow makes it easy to add a large, bright numeric display to any microcontroller project. ...
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The Adafruit 1.2" 4-Digit 7-Segment Display with I2C Backpack in yellow makes it easy to add a large, bright numeric display to any microcontroller project. The backpack handles all LED multiplexing and driving via I2C, so you only need two data pins to control a full 4-digit display.
The HT16K33 driver chip provides constant-current output for consistent brightness, 1/16-step dimming control, and a built-in oscillator — no external components needed. Address-selection jumpers allow up to eight 7-segment displays on a single I2C bus.
Key Features
- HT16K33 I2C Driver – Built-in multiplexing, constant-current drive, and 1/16-step dimming
- Simple I2C Interface – Only two pins required, with address jumpers for up to 8 displays on one bus
- Large 1.2" Yellow Digits – Bright and easily readable from across a room
- Arduino and Raspberry Pi Libraries – Well-documented libraries for quick setup
- Compact Backpack Design – Driver mounts directly behind the display
Also Available
Also available in a smaller 0.56" size.
Package Contents
- 1× Adafruit I2C LED backpack (assembled and tested)
- 1× 1.2" 4-digit 7-segment yellow display
- 1× 5-pin header
Note: A small amount of soldering is required to attach the display to the backpack board.
Jargon buster
Plain-language definitions for the technical terms used above.
- Address jumpers
- Address jumpers are small solder pads, links or switches used to change a device's address on a shared bus such as I2C. They matter when you want to connect several identical devices to the same controller, since each one needs a unique address to avoid conflicts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- 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.
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