What’s better than a single LED? Lots of LEDs! A fun way to make a small linear display is to use two 12-bar Bi-color bar-graphs. Wouldn’t it be awesome if you could control a colorful bargraph without tons of wiring? That’s where this LED bar-graph backpack comes in. Much like Adafruit’s 8×8 and 7-segment backpacks, this backpack pairs perfectly with our bar-graphs and manages all the LED control and multiplexing.
The backpack uses a driver chip that does all the heavy lifting for you: It has a built in clock so it can multiplex the display. It uses constant-current drivers for ultra-bright, consistent color, 1/16 step display dimming, all via a simple I2C interface. The backpack comes with address-selection jumpers so you can connect up to eight of these bar-graphs on a single I2C bus. You can also mix-and-match the bar-graph breakout with our other types of I2C LED backpacks.
The product kit comes with:
- A fully tested and assembled LED backpack stick
- Two 12-bar bi-color bar-graphs
- 4-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, they have a detailed tutorial showing you how to solder, wire and control the display. They even wrote a very nice library for the backpacks so you can get running in under half an hour, displaying images on the matrix or numbers on the 7-segment. If you’ve been eyeing matrix displays but hesitated because of the complexity, this is the solution you’ve been looking for!
Technical Details
- Bargraph Dimensions: 10mm x 30mm ( 0.4″ x 1.2″)
- 7mm (0.3″) thick
- Lots more LED details including dimensions, pinouts, etc in the datasheet, this is the Common-Cathode model KWL-R1230CDUGB
- Board Dimensions: 13mm x 101mm (.5″ x 4″)
Datasheets, schematic, EagleCAD PCB files, and Fritzing available in the product tutorial
Fast Shipping with Professional Packaging
Due to our longstanding partnership with UPS FedEx DHL as well as other major international carriers, we are able to provide a range of shipping options. Our warehouse staff is highly trained to package your goods exactly according to the specifications we provide. Your items will go through a thorough examination and will be safely packaged prior to being sent out. We deliver to thousands of customers every day from all over the world. The fact that we are determined to become the largest online retailer in the world is obvious. Warehouses and distribution centres can be located in Europe as well as in the USA.
It is important to note that orders with multiple items are subject to a processing period that is based to the particular item.
Prior to shipping, our team will perform an extensive inspection of the products you have ordered. Most orders today are shipped in 48 hours. The expected delivery time will be between 3 and 7 days.
Returns
Due to the multiple parties involved such as the factory and the warehouse, we cannot completely manage our stock. The actual levels of stock can change at any moment. It's possible that you may not receive your order once the order has been made.
Our policy is for 30 days. If 30 days have gone without a trace since the purchase however, we're unable to give you a return or exchange.
You are able to return a product in the event that it is not used and still in the same state as when you first received it. The item must be returned in its original packaging.
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