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. However, this LED bargraph is 'multiplexed' - so to control all the 48 LEDs you need a lot of pins. There are driver chips like the MAX7219 that can help control a bar-graph/matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit Adafruit feel your pain! After all, wouldn't it be awesome if you could control a colorful bargraph without tons of wiring? That's where this adorable LED bar-graph backpack comes in. Much like Adafruit's 8x8 and 7-segment backpacks, this backpack pairs perfectly with Adafruit's 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 Adafruit's 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, We also 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, his is the solution you've been looking for!
Bi-Color (Red/Green) 24-Bar Bargraph w/I2C Backpack Kit (4:37)
- 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")
This product is listed in:
Documentation and Resources:
- The Maker Revolution
The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...
- Addressable RGB LED Controllers
Addressable RGB LED strips are one maker favourite that can really spruce up any project or even be the star attraction of one. These strips allow you to select the colour, brightness and state of any LED in a long strip and can make for some truly...
- What Are NeoPixel LEDs?
So in case you haven’t heard yet, digital LEDs are the go-to solution for any project that uses RGB LEDs and you want to avoid the rat's nest that ensures when using multiple RGB LEDs, each colour requiring its own connection. Digital...
- What Are DotStar LEDs?
So in case you haven’t heard yet, digital LEDs are the go-to solution for any project that uses RGB LEDs and you want to avoid the rat's nest that ensures when using multiple RGB LEDs, each colour requiring its own connection. Digitally address...
- All About LEDs
Hello and welcome to our tutorial where we a look at all things LED. Now first of all, what is an LED? LED stands for Light Emitting Diode and is an electronic component used to convert electrical energy to light energy. This process is called electr...
- Time lapsing in OctoPrint (Properly!)
Now that we have decked out our Lulzbot Taz 6 3D Printer with a really nice looking acrylic enclosure, I'm just about ready to turn on some serious 3D printing work. But before I dive into that endless pool of fun, it's a good time to take 5 minutes and set up our Taz 6 and it's OctoPrint Server with a bed-mounted camera and light system. That way I can monitor my prints from the other side of the warehouse using OctoPrint, and m...
Exact shipping can be calculated on the view cart page (no login required).
We deliver Australia-wide with these options:
- $3 for Small Items (3-7 days, not tracked, only available on selected small items)
- $6.95 for Standard Post (2-4 days, tracked)
- $8.95 for Express Post (Overnight for Australia Post Next Day Network, tracked)
- Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)
International Orders - the following rates are for New Zealand and will vary for other countries:
- $11.49 for Pack and Track (3+ days, tracked)
- $16.50 for Express International (2-5 days, tracked)
If you order lots of gear, the postage amount might increment based on the weight of your order.
Our physical address:
Unit 18, 132 Garden Grove Parade
Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.