How To:
https://www.instructables.com/id/Cheap-Smart-Garage-Door-Opener/

I made this smart garage door opener using a Sonoff Basic modified so that it acts like a momentary switch instead of letting power pass through.

Products:
Sonoff Basic - https://www.amazon.com/Sonoff-Remote-Control-Compatible-Android/dp/B078GDFYTY/ref=sr_1_4?dchild=1&keywords=sonoff+basic&qid=1599697488&sr=8-4
Contact Sensor - https://www.amazon.com/gp/product/B07F314V3Z/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
USB To Serial - https://www.amazon.com/gp/product/B00IJXZQ7C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Heat Gun - https://www.amazon.com/Homidic-Handheld-Electric-Portable-Embossing/dp/B07P5WFHJ7/ref=sr_1_6?crid=3451YJM75QTG0&dchild=1&keywords=heat+gun&qid=1599697596&sprefix=heat+%2Caps%2C309&sr=8-6
Soldering Iron - https://www.amazon.com/Vastar-Soldering-Iron-Full-Welding/dp/B01712N5C4
Heat Shrink Tubing - https://www.amazon.com/Ginsco-580-pcs-Assorted-Sleeving/dp/B01MFA3OFA/ref=sr_1_4?crid=28CROL90DKPGJ&dchild=1&keywords=ginsco+heat+shrink&qid=1599697646&sprefix=ginsco+hea%2Caps%2C332&sr=8-4
Wire - https://www.amazon.com/Electrical-Flexible-Silicone-different-automotive/dp/B07G744V5Z/ref=sr_1_4?dchild=1&keywords=electrical+wire+set&qid=1599697868&sr=8-4
Wire Sleeve - https://www.amazon.com/gp/product/B07FW3MKGH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Dupont Cables - https://www.amazon.com/gp/product/B01MU0IMFF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1


Software:
Home Assistant - https://www.home-assistant.io/
ESPhome - https://esphome.io/
ESP Easy - https://www.letscontrolit.com/wiki/index.php/Main_Page