Holla

Description

Holla is an interactive screaming battle. Yell as loud as you can to shoot a beam of light from your mouth and defeat your opponent! Let off all your stress by screaming like never before.

Inspired by the duel between Lord Voldemort and Harry from Harry Potter, Holla is a battle to scream louder (and longer) than your opponent.

This project was done with Chae Eun Park for the Horizons Hackathon by HackGT in February 2020 at the Georgia Institute of Technology.

Requirements

Devices

1. Computer (macOS or Windows)
2. Arduino Mega (or Arduino Uno)

Installations

1. Install Arduino IDE and required packages.
   • Install Adafruit_DotStar.

Building the Holla

Materials

• Adafruit DotStar Digital LED Strip
• ELEGOO Big Sound Sensor x2
• 12"x24" 1/8" Clear Acrylic Sheet x3
• 12"x24" 1/4" MDF Board x1
• 8ft 2"x4" Wood Stud x1
• Electrical wires
• Tape

Tools

• Lasercutter(Laser engraver)
• Woodworking Tools
  • Bandsaw
  • Miter saw
• Electronics Equipment
  • Soldering iron
  • Wiring kit (wires, wire strippers, electrical tape, solder, etc.)
• Basic Tools
  • Hot glue gun and hot glue sticks (or superglue)

Construction Instructions

1. Cut the 2x4 wood stud
   • Cut the stud to be 8ft long and at least a 1"x2" rectangle with a flat top and bottom
2. Cut the LED strip
   • Cut the LED strip to include 58 (or other desired number of) LEDs
   • Solder the 4 wires to the end of the LED strip
3. Attach LED strip to wood stud

   • Center the LED strip with the center of the wood stud

   • Attach the LED strip along the center of the wider side with hot glue

     

4. Laser cut using holla_lasercut.ai
   • Use pages 1 and 2 to cut the appropriate number of acrylic circles
   • Use page 3 to cut twice the number of MDF supports than acrylic circles
   • Use page 4 to cut two sound chambers
5. Glue lasercut components together

   • Hot glue 1 MDF support on each side of each acrylic circle

     

   • Glue 4 acrylic trapezoids together to create a sound chamber, repeat for the second one

6. Assemble all components

   • Attach one acrylic-MDF assembly above each LED such that the acrylic circle is directly above the LED

   • Attach the two sound chambers on either side of the wood stud

   • Attach one big sound sensor inside of each sound chamber

     

7. Wiring
   • Wire all necessary components
   • Group and hide all wires to the side of the wood stud
   • Gather all wires to the center of the setup so that they can be connected to the Arduino

Running the Game

1. Connect all wires according to the diagram below.

   • If changing the pins, change them accordingly in lines 4-8 of Holla.ino.

2. Connect to Arduino and upload code.

   • Upload Holla.ino to the Arduino.
   • Keep the Ardunio connect to the computer or connect the Arduino to a power supply.

Playing the Game

Rules

• The game is played by 2 players.

• Both players scream as loud as they can into the sound chambers until one completely fills all the LEDs with their color.

• Screaming louder pushes a player's beam further towards the other side.

• When the two beams meet, they push against each other and the movement is determined by the difference in the screaming volumes.