{"title":"Bi-Color (Red/Green) 24-Bar Bargraph w/I2C Backpack Kit","handle":"bi-color-red-green-24-bar-bargraph-w-i2c-backpack-kit","url":"/products/bi-color-red-green-24-bar-bargraph-w-i2c-backpack-kit","description":"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.\n\nAddress-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.).\n\nKey Features\n\n\n24-Bar Bi-Colour Display – Red, green, and yellow (both on) per bar\n\nI²C Interface – Control all 48 LEDs from just two data pins\n\nConstant-Current Drivers – Consistent brightness without external resistors\n\n1/16-Step Dimming – Software-adjustable brightness\n\nAddress Selectable – Up to 8 backpacks on one I²C bus\n\nBuilt-In Clock – On-chip multiplexing, no additional timing circuitry needed\n\n\n\nTip: Some soldering is required to attach the bargraph modules to the backpack PCB — approximately 5 minutes of easy through-hole work.\n\n\nIdeal For\n\nAudio level meters and VU displays\nSensor data visualisation\nStatus indicators and progress bars\nArduino, Raspberry Pi, and microcontroller projects\n\n\nPackage Contents\n\n1× I²C LED Backpack (assembled and tested)\n2× 12-Bar Bi-Colour LED Bargraph Modules\n1× 4-Pin Header\n\n\nResources\n\nLED Backpack Tutorial\nArduino Library (GitHub)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":8873,"title":"Default Title","sku":"AF-1721","price":21.14,"on_sale":false,"in_stock":true,"available_quantity":13,"option1":"Default Title"}]}