So, I'm trying to create a remote dog treat dispenser. I decided to start with the Manners Minder remote treat dispenser because it comes with a small remote control that dispenses a treat when a button gets pushed. After browsing around the internet, it seemed to me that the same arduino setup used in the mydooropener.com project should work. It seemed to me that so long as the remote has two contacts that I could solder to a relay, I should be able to control the remote using the arduino. Once I opened up the remote, however, I discovered that the buttons look identical to the reset buttons on the arduino uno, and have 5 prongs instead of four. I assume the 5th contact serves as a ground, but I'm not sure.
As a result, I'm now somewhat confused as to how to wire this to the relay. Do I need to connect the ground to the relay board? Does it matter which wire goes from the NO and/or COM contact to either side of the button?
Any advice would be greatly appreciated. I can post pictures if necessary also. Thanks!