I am trying to get a swing bedroom door opener working dependably. All the online resources I have consulted so far have been so technically above my paygrade as to be of no help to my old brain.
My design is essentially a stepper motor with a 65mm RC car tire mounted on the bottom at the edge and driving the door across the floor thru the opening arc. A couple of limit switches stop the motor when the door is fully open or closed.
The components are an Arduino MKR WiFi 1010, an L298N controller (https://smile.amazon.com/gp/product/B01M29YK5U/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1), a NEMA 17 stepper (https://www.sparkfun.com/products/9238), and a 12v battery (https://smile.amazon.com/gp/product/B016BJCRUO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1).
The motor skips and cannot open the door when the AC is running as air pressure pushes the door closed. With a digital luggage scale I measured that it takes 3.5 lbs of pull to open the door when the AC fan is running.
Can someone please teach me how to determine the proper torque spec / motor for this application?