@SimpleElectronics

Love the dramatic lighting - I know the period for recommendations has closed but I would love 2 more buttons - one to pause/play the animation and another to step through it so you can make a little chart!

@tripplegracing8276

KiCad rocks, this project actually inspires as well to create as similar tester...... got the creative juices flowing.

@pileofstuff

Guilty as charged.  I've made a ton of serial cables with only 3 pins connected...

@justanothercomment416

I remember those days. Countless cables and adapters exchanged because of this very problem.

@daviddevillers6790

Null modem! That's rich. Nice project!

@alexstone691

If i did this i would make it microcontroller-less with a binary counters

@Chriva

Gaaaah! Align the LEDs. Align the LEDs! 😂

@Batmule

No diagram? I was wondering how you did it.