https://learn.adafruit.com/electroknit
https://blog.adafruit.com/2010/11/02/tutorial-tuesday-hacking-the-brother-kh-903a-knitting-machine/
https://blog.adafruit.com/2012/07/26/updated-tutorial-hacking-the-brother-kh-930e-knitting-machine/
https://petapixel.com/2011/09/26/old-school-knitting-machine-hacked-to-knit-photos-onto-garments/