Arduino and multiplexed 7-segment display

We connect a 7-segment display to the Arduino Uno. You see these displays about on ebay, described as:

"4-Bit LED Digital Tube Module"

It uses two 74HC595s to remember the row selector and digit bit patterns, and you have to multiplex the display to make 4 digits appear simultaneously.

Arduino code can be found at Github;

https://github.com/magiccow/_7seg-display-simple

And the ISR-based code I showed

https://forum.arduino.cc/index.php?topic=316731.60

Thanks to 'aarg' !

Here's a display similar to the one demonstrated (only £1 at the time of posting):

http://www.ebay.co.uk/itm/1PCs-4-Bits-Digital-Tube-LED-Display-Module-Four-Serial-for-Arduino-595-Driver-/301724379793?hash=item46402caa91:g:v9gAAOSwpdpVcUzB

See also the earlier video on the Saleae logic analyser:

https://youtu.be/tu7Af_ZCkeo

Видео Arduino and multiplexed 7-segment display канала Martyn Davies