Sign In SHOP BLOG LEARN FORUMS 0 Items VIDEOS LEDS / SEGMENTED / ADAFRUIT 1.2" 4-DIGIT 7-SEGMENT DISPLAY W/I2C BACKPACK - RED Adafruit 1.2" 4-Digit 7Segment Display w/I2C Backpack - Red PRODUCT ID: 1270 IN STOCK ADD TO CART 1 1-9 10-99 100+ ADD TO WISHLIST DESCRIPTION TECHNICAL DETAILS DESCRIPTION What's better than a single LED? Lots of LEDs! A fun way to make a numeric display is to use a 4-digit 7-segment display. LED matrices like these are 'multiplexed' - so to control all the sevensegment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these adorable LED matrix backpacks come in. We have them for a variety of 8x8 and 7-segment displays. They work perfectly with the displays we stock in the Adafruit shop and make adding a bright display trivial. The backpacks use a driver chip that does all the heavy lifting for you: They have a built in clock so they multiplex the display. They use constant-current drivers for ultra-bright, consistent color (the images above are photographed at the dimmest setting to avoid overloading our camera!), 1/16 step display dimming, all via a simple I2C interface. The backpacks come with addressselection jumpers so you can connect up to eight 7-segments (or a combination, such as four mini 8x8's and four 7-segments, etc) on a single I2C bus. The product kit comes with: A fully tested and assembled LED backpack Ultra-bright 4-digit 1.2" tall red seven-segment display 5-pin header A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes. Of course, in classic Adafruit fashion, we also have a detailed tutorial showing you how to solder, wire and control the display. We even wrote very nice libraries for the backpacks so you can get running in under half an hour, displaying numbers on the 7-segment for either Arduino or Raspberry Pi. If you've been eyeing matrix displays but hesitated because of the complexity, his is the solution you've been looking for! New Products 2/16/2013 Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack Red (1:50) TECHNICAL DETAILS Measurements after you mount the screen: 50mm/2" wide 120mm/4.7" long 13mm/0.5" high This board/chip uses I2C 7-bit addresses between 0x70-0x77, selectable with jumpers. EagleCAD PCB files, datasheets, and Fritzing available in the product tutorial LEARN Adafruit LED Backpacks Control small LED matrices with ease Large Pi-based Thermometer and Clock Build a large LED Thermometer / Clock using a Raspberry Pi LED Backpack Displays on Raspberry Pi and BeagleBone Black Use LED matrix, bar graph, and segment displays on your favorite small board computer. Arduino GPS Clock Build your own clock that sets itself with an Arduino, LED display, and GPS receiver! Raspberry Pi Physical Dashboard Build a dashboard to visualize data on LED displays and automotive gauges! Personalized NextBus ESP8266 Transit Clock Spend more time chillin' and less time at the bus stop CircuitPython Hardware: LED Backpacks & FeatherWings How to use LED Backpacks & FeatherWings with CircuitPython! MAY WE ALSO SUGGEST... Red 7-segment clock display - 0.56" digit height Adafruit 0.56" 4-Digit 7Segment Display w/I2C Adafruit 7-Segment LED Matrix Backpack Quad Alphanumeric Display - Blue 0.54" Digits w/ I2C Bi-Color (Red/Green) 12-LED Bargraph - Pack of 2 Adafruit 1.2" 4-Digit 7Segment Display w/I2C Bi-Color (Red/Green) 24-Bar Bargraph w/I2C Backpack Adafruit 1.2" 4-Digit 7Segment Display w/I2C Quad Alphanumeric Display - Red 0.54" Digits w/ I2C Adafruit 7-Segment Backpack - 1.2" Tall Digits DISTRIBUTORS EXPAND TO SEE DISTRIBUTORS CONTACT SUPPORT DISTRIBUTORS "Premature optimization is the root of all evil" - Donald Knuth EDUCATORS JOBS FAQ SHIPPING & RETURNS TERMS OF SERVICE PRIVACY & LEGAL ABOUT US ENGINEERED IN NYC Adafruit (R) 4.9