EasyDriver and the A3967
https://www.schmalzhaus.com/EasyDriver/ https://www.sparkfun.com/products/12779 https://www.robotgear.com.au/Product.aspx/Details/2940-EasyDriver-Stepper-Motor-Driver Letting the blue...
Pull up/down switch and de-bounce
http://tinyurl.com/vopamo6 Schmitt inverter to led then...