Video https://youtu.be/ZZsFSBntyFs

Pickup design not mine. link to creator here https://www.thingiverse.com/thing:417640

Here are the parts I used to make it. You could save money by making counter from a calculator, 3d printing the mounting hub and using a 12v battery for the power source.
Counter
https://www.amazon.com/gp/product/B01MQLI89U/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Copper Wire
https://www.amazon.com/gp/product/B007TUQW1K/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1

Mounting Hub
https://www.amazon.com/gp/product/B00B887FX8/ref=ppx_yo_dt_b_asin_title_o07_s01?ie=UTF8&psc=1

Power Source
https://www.amazon.com/gp/product/B0745YDSJS/ref=ppx_yo_dt_b_asin_title_o07_s02?ie=UTF8&psc=1

Motor
https://www.amazon.com/gp/product/B0745YDSJS/ref=ppx_yo_dt_b_asin_title_o07_s02?ie=UTF8&psc=1

Speed adjustment
https://www.amazon.com/gp/product/B07VPNHS5J/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1