My Secret Dice Box

My Secret Dice Box 

The Secret Dice Box is a sealed box that automatically opens upon “rolling” a combination sequence, revealing the treasures stored inside.  

This project was completed for a microprocessor programming class in the Sierra College (Rocklin, CA) Mechatronics Program. 

Here's a video demonstrating the functionality, the combination is set to 3-5-4-6-2-1:

 

 Here's the circuit schematic for the electronics:

The Picaxe 08M2 is at the heart of this project.  I used a digital accelerometer to determine what side the die is on.  By way of I2C protocol, this digital accelerometer (MMA8451) made static object orientation detection a breeze.

Here's the detailed parts list:

• Picaxe 08M2 Microcontroller
• Osepp LS-1006A Metal Gear Analog Servo
• Adafruit Triple-Axis Accelerometer MMA8451 Breakout Board
• [R3 & R4] 4.7k Ohm Resistors (2)
• Square Latching Switch
• Panel Mount 2.1mm DC Barrel Jack
• 3AA Cell Battery Holder
• Picaxe 08 Proto Board Kit:
  • Proto Board PCB
  • [R1] 10k Ohm Resistor
  • [R2] 22k Ohm Resistor
  • [C1] 100nF Polyester Capacitor
  • 8-pin IC Socket
  • 3.5mm Stereo Programming Jack
  • 3-pin Header & Jumper Link
  • Battery Clip

Here's the internal latch mechanism and electronics layout:

  

More Photos:

close-up of DC Barrel Jack

close-up of semi-hidden latching switch

 

spring loaded lid assembly

some early prototype photos and sketch:

Here's the code:

This project was inspired by PICing4fun's project: 

and by these projects on DeddiesLab:  

http://deddieslab.blogspot.com/2010/09/for-friends-wedding-we-had-to-find-way.html

&

http://deddieslab.blogspot.com/2011/01/secret-dicey.html 

-Thanks Guys!