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 seven-segment 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 address-selection 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.
Data sheet
Manufacturer BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
Responsible person BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20
4-digit 7-segment LED display, 1.2" diagonal, with a built-in controller allowing communication via the I2C bus connected to the Stemma QT/Qwiic connector. Red display. Adafruit 1270
No product available!
4-digit 7-segment display with MAX7219 driver chip. Adafruit 1269
7-segment LED display, 1 digit 30.60mm, black background green (575nm), 20mcd (10mA), common anode, red (630nm), 20mcd (10mA), common anode. Pb-free. LED1-AS-B-12011BMRMG
7-segment LED display, 1 digit 38.10mm, amber (605nm), 15,000ucd (10mA), common anode, Pb-free. LED1-AS-B-15011BMA
No product available!
7-segment LED display, 1 digit 38.10 mm, blue light (470nm), 12 mcd (10mA), common anode, Pb-free. LED1-AS-B-15011BMB
No product available!
7-segment LED display, 1 digit 38.10mm, bright green (575nm), 15,000ucd (10mA), common anode, Pb-free. LED1-AS-B-15011BMG
No product available!
7-segment LED display, 1 digit 38.10mm, bright red (648nm), 20mcd (10mA), common anode, Pb-free. LED1-AS-B-15011BMR
No product available!
7-segment LED display, 1-digit 45mm, amber (605nm), 15mcd (10mA), common anode, Pb-free. LED1-AS-B-18011BMA
No product available!
7-segment LED display, 1-digit 45mm, bright green (575nm), 15mcd (10mA), common anode, Pb-free. LED1-AS-B-18011BMG
No product available!
7-segment LED display, 1-digit 45mm, bright red (648nm), 20mcd (10mA), common anode, Pb-free. LED1-AS-B-18011BMR
No product available!
7-segment LED display, 1 number 45mm, yellow color (585nm), 15mcd (10mA), common anode, Pb-free. LED1-AS-B-18011BMY
7-segment LED display, 1 digit 14,20mm, blue color (470nm), 12mcd (10mA), common anode, Pb-free. LED1-AS-B-23011BB
No product available!
7-segment LED display, 1 digit of 56.80mm, green (570nm), 20mcd (10mA), common anode, Pb-free. LED1-AS-N-23011BMG
No product available!
7-segment LED display, 1 digit of 56.80mm, red (660nm), 20mcd (10mA), common anode, Pb-free. LED1-AS-B-23011BMR
No product available!
7-segment LED display, 1 digit of 56.80mm, bright green (573nm), 40mcd (20mA), common anode, bright red (640nm), 40mcd (20mA), common anode. Pb-free. LED1-AS-B-23011BMRMG
No product available!
7-segment LED display, 1 digit 101.60mm, red color (648nm), 60 mcd (10mA), common anode, Pb-free. LED1-AS-B-40011DMR
No product available!
7-segment LED display, 1 digit 101.60mm, bright green (573nm), 50 mcd (10mA), common anode, bright red (640nm), 40 mcd (10mA), common anode. Pb-free. LED1-AS-B-40019BMRMG
No product available!
8x8 matrix or a 4-digit 7-segment display. Matrices like these are \'multiplexed\' - so to control all the seven-segment LEDs you need 14 pins. Adafruit 881
4-digit 7-segment display with MAX7219 driver chip. Adafruit 1269