The Adafruit Bi-colour Bargraph Backpack Kit uses a clever constant current driver chip to take all the pain out of driving its 48-LEDs, you just have to supply an I2C bus from your microcontroller. Each segment contains 1 x red LED and 1 x green LED giving you 4 x states, red, green, yellow, and off. Each LED can be set to one of 16 x brightness levels as well. Normally this would require a mass of wiring and GPIO lines plus some clever programming, but the backpack design only needs 2 x I2C pins plus power. There are I2C address selection jumpers that allow you to have up to 8 x of these on one I2C bus. And that's a lot of LEDs. The whole thing is on a board just barely wide enough to hold the surface mount driver chip, no wasted space.
Supplied as an assembled and tested backpack board plus 2 x 12-segment LED bargraphs and a small strip of 0.1in. header pins for you to solder on. Adafruit provide a free tutorial to get you started plus a useful library which covers several products such as Adafruit 4-digit 7-segment displays which also have I2C backpacks.
- Add an 24-LED bargraph display to your project using only 2 x I2C lines
- 24 x bi-colour, rectangular pixels
- Built-in constant current drivers and multiplexers
- 15 levels of brightness control for the ultra-bright LEDs
- Suitable for 3.3 and 5V power supplies
- 2 x mounting holes
- Dimensions 10 x 30 x 7mm (0.4 x 1.2 x 0.3in.)
- Adafruit part no.: 1721
*Customers looking to resell on eBay or Amazon should contact Adafruit directly.
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