Stitch Regulator for Sewing Machines With Standard 15v 3mA Foot Pedals

This was an attempt at making an optically tracked speed regulator for embroidery on standard sewing machines. I got it roughly working, but didn't have time to fine tune it or 3d print something to mount it to my machine. This project just shows how far I got... if anyone tries, I hope it works for you, this was done a few years ago but someone recently expressed interest in it so I'm throwing it up here.

If the mp4 doesn't work here's an imgur link:

https://imgur.com/cant-afford-fancy-bernina-so-trying-to-make-stitch-regulator-on-own-progress-UQ4MHym

basically you plug your foot pedal into the female headphone jack input.

when you push your pedal down, it lights up the LED and allows the potentiometer to affect your machine speed, otherwise machine speed = 0.

the mouse optical sensor then measures the fabric speed.

and uses the X9C103S digital potentiometer to control your machine speed.

amazon basics 3 wire computer mouse for the sensor:

https://www.amazon.com/dp/B005EJH6RW

a 3.5mm mono or stereo female headphone jack for the foot pedal input

a 3.5mm mono or stereo male headphone jack

a X9C103S digital potentiometer board:

https://www.amazon.com/gp/product/B07Y24CNDL

an Arduino nano

a 3v 100mA LED

a 330 ohm resistor

a machine that takes a standard 15v 3mA foot pedals like this one:

https://www.amazon.com/Sewing-Machine-Controller-Singer-XL%E2%80%91400/dp/B09PRJVDMB

I drew this schematic pretty rough and quick. Like I said this project sat in my closet for a few years and I haven't tested it since then. Hopefully this still works! I've also included the .ino file.