This is a terrible way to do anything but I'm posting it so you can know what not to do.

This dropper spins a servo with a hook attached to drop a payload remotely. I used a esp8266 with this https://circuits4you.com/2019/01/12/esp8266-servo-motor-control/ to control the servo. It's simple and worked well right up until I realized you don't need to do any of this extra work and can just shake the payload off of the hook.

I would suggest to use This design over the complicated dropper. 

Category: R/C Vehicles