* Circuitry Parts List
All of these parts were ordered from Adafruit. While not the cheapest, Adafruit
provides a valuable service to beginners by narrowing down the nearly infinite
field of components into a few of each category to choose from.

** Arduino
- [[https://www.adafruit.com/product/3677][ItsyBitsy 32u4 - 5v]]
** Motors and Solenoid
- [[https://www.adafruit.com/product/324][NEMA-17 Stepper motor - 12v 350mA]]
- [[https://www.adafruit.com/product/412][Small Push-Pull Solenoid - 12v]]
- 2x [[https://www.adafruit.com/product/807][Dual H-Bridge - L293D]]
  + I have learned since ordering this that it is a pretty inefficient chip, but
    it seems to be working just fine for my needs.
** Control
- [[https://www.adafruit.com/product/1384][Log-scale Analog Light Sensor]]
- 2x [[https://www.adafruit.com/product/819][Micro Switch w/ Roller Lever]]
** Connectivity
- 3x [[https://www.adafruit.com/product/2880][2-pin JST Plug + Receptacle Set]]
  + Open limit switch
  + Close limit switch
  + Solenoid
- [[https://www.adafruit.com/product/1663][3-pin JST Plug + Receptacle Set]]
  + For connecting two toggle switches for manual override
  + Optionally add one additional if you want the light sensor detached from the
    board
- [[https://www.adafruit.com/product/578][4-pin JST Plug + Receptacle Set]]
  + For connecting the stepper motor
- [[https://www.adafruit.com/product/373][2.1mm DC barrel jack]]
- [[https://www.adafruit.com/product/2670][Bakelite Perfboard Plates]]
** Also need
- 12v power supply
  + This could be a wall outlet, or a car battery
- Breadboard and jumper cables for prototyping
- Acrylic or light plywood for the door
- Acrylic for the light sensor window