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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
4-digit 7-segment display with MAX7219 driver chip. Adafruit 1269
Pololu m3pi Robot with mbed SocketPowerful Polol 3pi robot work. Line Follower mobile platform with two motors, 5 reflection sensors, LCD display, buzzer and three user buttons as well as mbed extension board. Pololu 2151
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Lithium 3V / 210mAh lithium coin cell battery. Battery dimensions: diameter 20mm, height 3.2mm, weight 3.1g
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Printed circuit board and programmed circuit for universal timer 0 to 99min. AVT3200 A +
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Small computer based on Samsung Exynos5422 Cortex™-A15 2Ghz and Cortex™-A7 Octa core CPUs. The Ordoid XU4 does not includes Power Supply 5V 4A and Cooling Fan (mounted)
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AVT kit for self-assembly of the (half) home automation system - four-channel ON / OFF module. AVT3212 B
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WORK SIGNALING DEVICE FOR HOUSEHOLD APPLIANCES - A KIT FOR INDEPENDENT INSTALLATION
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4-digit 7-segment display with MAX7219 driver chip. Adafruit 1268