Automatic pet feeders with app controls are nothing new. You can buy them on Amazon and many other sites. You can also build your own if you have a 3D printer and know electronics. Ntrobotics has shared a guide that shows you how to 3D print and build your own smart pet feeder.
The pet feeder can be controlled over the Internet. Adafruit Feather HUZZAH with ESP8266 WiFi is used to control the device. Continuous Rotation Micro Servo [FS90R] is used to drive this pet feeder. Pretty cool project if you ask us.