Adafruit 1721 Bi-colour Red / Green 24-Bar Bargraph With I2C Backp...

Product Description

Adafruit Bi-Colour (Red/ Green) LED Displays with I2C Backpack Kit
- Adafruit 1721, 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 & 1 x green LED giving you 4 x states, red, green, yellow, & off. Each LED can be set to one of 16 x brightness levels as well. Normally this would require a mass of wiring & 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. & 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 & tested backpack board plus 2 x 12-segment LED bargraphs & 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. Adafruit 1721 Bi-colour Red / Green 24-Bar Bargraph with I2C Backpack Kit