Using the Arduino development platform you will learn how to display numbers and letters on a single 7-segment LED display. There are many ways to drive 7-segment displays, and this is a fairly simple method. However, using this method to drive even one LED 7-segment array “burns” (occupies) many of the digital I/O pins on your Arduino. In later projects, I’ll show you how to use a dedicated 7-segment LED driver.
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Thanks for this. I’m just starting out with my Arduino and had a common cathode 7 segment display so your code was just what I wanted to get started.
In order to multiple 7-segment LED… How can we do a dedicated 7-segment LED driver?
Thanks.
I tried to verify the code and got errors… please confirm
Hi,
I was also having trouble with this code. After a little bit I finally got it working and submited a pull request on GitHub but apparently they don’t accept requests very often.
If you’re having trouble, feel free to try my version on https://github.com/karlalopez/Make-Projects/tree/master/_7_segment
Cheers!
If you want to build it yourself and like to solder, LucidTronix has a DIY kit that makes the wiring easier: http://lucidtronix.com/products/7
the code is full of bugs pfff
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Your Code on Github has a few mistakes in it… I posted a pull request…
I was looking for a good starting point for lighting up a similar LED that I had wanted to use on a project (with potentiometer, sound, and servo motor). The project turned out well, but I ended up scrapping this code and wanted to give a respectful warning to others that this code will need a little work, so be prepared.
Firstly, it won’t compile as-is with the couple of typos it has.
In my case, my LED uses HIGH to light up (as you might expect), so bear this in mind.
From an efficiency standpoint also you may want to consider encapsulating some of the digitalWrite logic so that there are not as many lines of redundant code.
I’d be curious to see what Mr. Frog (commenter below) had done. I ended up overdoing it a little with a way to pass the on/off codes as a string encoding, but this is a good talking point for any student learners.
e.g.
void light_all() { drawLEDfromArray( “11111111” ); }
void clear_all() { drawLEDfromArray( “00000000” ); }
void char_A() { drawLEDfromArray( “11101110” ); }
void drawLEDfromArray( char bits[] ) {
// this lights up LED segments 0..8 when the correspond ing array item is ‘1’
for (int i=0; i < LED_segments ; i++)
if (bits[i] == '1')
light_on(LED_Pins[i]);
else light_off(LED_Pins[i]);
}
MAKE – Will you consider a tutorial on using an Arduino to drive a pair of “large” set of these LEDs? Those big displays as you know require 9-12V and can not be driven by microcontroller pins or a shift register (not even the tpic6b595).
Arduino forums are littered with novices asking how to do this (and surprisingly no one’s published a web tutorial, just some YouTube videos showing a successful build).
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would it be possible to command 7 segment 0-9 in dosbox or cmd using notepad?
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