hi there,
thanks for all your responses. I should be more clear I've figured out the timed dispensing part now what i need help with is allowing access. The dog has a taste for the cat food and now he's a big fatty so i want to restrict his access. I have a adafruit PN532 stacked on an Uno and i can attach RFID tags to the cats collars so when they approach a servo will open a door.
thanks