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 necessary (159-176).

There's also a fallback method to just hit any switches that are HIGH in case the linked list fails to capture a trigger (179-192).

When the program becomes idle (no switches are available to hit) it resets back to a default state by moving the platform all the way left until the lever switch (Home Switch) is hit, and resetting the arm & lid (Door) servo positions (245-274).