Useless Box - Multi Switch

This is a Useless Box that flips multiple switches instead of just one. It uses a stepper motor & A4988 driver to move the arm, and two servos - one for the arm, and one for the lid.

The box is controlled by an ATMEGA328P.

In Action:
https://i.imgur.com/oVlNI0r.mp4

Code:
https://github.com/coffeman500/UselessBox/blob/master/useless_box_arduino.ino

Schematic:
https://easyeda.com/coffeman500/useless-box

Parts:

Arduino Uno
L7805 & L7806
Arm Servo
Door (Lid) Servo
Stepper Motor Belt
A4988 Stepper Motor Controller
Stepper Motor
5cm x 7cm Protoboard
Pulley Wheel
Female Power Plug
Power Adapter
Home Switch
Switches
Box Hinges
Assorted m3 & m4 nuts & bolts


Summary:
The program uses switch interrupts to watch the 3 switches. When flipped the interrupt fires (Line 62-117) and adds any switched pins to the linked list (Line 37-44).

The main loop then watches the linked list, and goes to turn off any nodes added as they appear, moving down the list as n