14-Segment Alpha-numeric LED FeatherWing
Created by lady ada
Last updated on 2018-08-30 06:12:59 PM UTC
Guide Contents
Guide Contents
Overview
Pinouts
Power Pins
I2C pins
Address Jumpers
Changing Addresses
2
3
7
7
8
8
9
Assembly
Prepare the header strips:
Add the FeatherWing PCB:
And Solder!
10
10
10
11
Usage
Install Adafruit GFX
Run Test!
Library Reference
ASCII data
Writing Data
CircuitPython
Adafruit CircuitPython Module Install
Bundle Install
20
20
21
23
24
24
25
25
25
Usage
I2C Initialization
26
26
LED Matrix
Brightness and Blinking
26
29
LED 7-segment Display
Setting Individual Digits
Display Numbers and Hex Values
31
32
32
LED 14-segment Quad Alphanumeric Display
Downloads
Schematic
Fabrication Print
33
36
36
36
© Adafruit Industries
https://learn.adafruit.com/14-segment-alpha-numeric-led-featherwing
Page 2 of 36
Overview
Display, elegantly, 012345678 or 9! Gaze, hypnotized, at ABCDEFGHIJKLM - well it can display the whole alphabet.
You get the point.
This is the Adafruit 0.56" 4-Digit 14-Segment Display w/ FeatherWing Combo Pack! Available in Blue, Green, Red,
White, and Yellow. It is a nice, bright alphanumeric display that shows letters and numbers in a beautiful hue. It's super
bright and designed for viewing from distances up to 23 feet (7 meters) away. Each of the digit sets have 14 segments
on a dark background and we give you a set of two alphanumeric displays as well as a Featherwing driver board so
you can make a clock or a four letter word.
Works with any and all Feathers!
© Adafruit Industries
https://learn.adafruit.com/14-segment-alpha-numeric-led-featherwing
Page 3 of 36
14-Segment Matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you need 18 pins. That's a
lot of pins, and there are
driver chips like the MAX7219
(http://adafru.it/453)
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. Wouldn't it be awesome if you could control a matrix without
tons of wiring? That's where these Alphanumeric LED Matrix FeatherWings come in, they make it really easy to add a
4-digit alphanumeric display with decimal points.
© Adafruit Industries
https://learn.adafruit.com/14-segment-alpha-numeric-led-featherwing
Page 4 of 36
The LEDs themselves do not connect to the Feather. Instead, a matrix driver chip (HT16K33) does the multiplexing for
you. The Feather simply sends i2c commands to the chip to tell it what LEDs to light up and it is handled for you. This
takes a lot of the work and pin-requirements off the Feather. Since it uses only I2C for control, it works with any
Feather and can share the I2C pins for other sensors or displays.
The product kit comes with:
A fully tested and assembled Adafruit 4-Digit 14-Segment LED Matrix Display FeatherWing
Ultra-bright 4-digit 0.54" tall segmented display
Two sixteen pin headers
A bit of soldering is required to attach the matrix onto the FeatherWing but its very easy to do and only takes about 5
minutes!
© Adafruit Industries
https://learn.adafruit.com/14-segment-alpha-numeric-led-featherwing
Page 5 of 36
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