This simple project just uses a few materials to build a cable tester allowing you to test any combination of male and female DE-9 (DB9) cables.

New software allows you to control the speed and has a manual step mode.

This project requires

Arduino Nano - https://amzn.to/3ysygOz

18 @ 5mm LEDs - https://amzn.to/3WQ7TvY

9 @ 330 ohm resistors - https://amzn.to/4boEXQi

4 DE-9 connectors - https://amzn.to/3QSAUmT

Optional parts:

Female Headers for Nano & screen https://amzn.to/3UMBFPF

7 Segment Display - https://amzn.to/4c25rqP

Button between A6 and Ground for changing modes - https://amzn.to/4az7dys

Videos

Original video - https://youtu.be/sIz-WxQSOvI

Follow up with new modes - https://youtu.be/EUoBqu93dfM

Follow Up

Code can be found here:

https://github.com/mudmin/AnotherMaker/tree/master/9%20Pin%20Cable%20Tester

If you are not familiar with programming the Arduino, you can find the software and instructions here:

https://www.arduino.cc/en/Guide/ArduinoNano