1. DRUM ANYWHERE
ECE 492 Group 4 Jake Davidson - Justin Ferris - Kelvin Liang - Shivansh Singla

2. Project Breakdown Audio Codec Synthesizer SD Card interfacing
IMU Sensors
Spatial Recognition

3. Functionality & Motivation
Two drumsticks and one foot band enables the user to play up to 7 different drums. Drum selection is computed through the combined feedback of an accelerometer and a gyroscope. Acceleration measures force (magnitude) of the sound while the gyroscope determines which sound to play. The result being a product that:
Can be played anywhere at anytime
Has minimal equipment required
Is cheap
Is Fun
Is Expandable

4. Design: Hardware
External: 3 IMUs 1 SD Card Speakers Internal: Audio Codec Synthesizer Nios II/e processor with MicroC OS SD Card interface

5. Design: Software 3 Main Sections
Signal Handler, Spacial Recognition, Digital Synthesizer
Software implemented synthesizer
Interrupt based data retrieval

6. Challenges
Hardware solution that is small, fast, and durable enough to fit on drum sticks
Retrieving wave signals from SD Card and outputting them to the speakers within appropriate time frame
Computation of drum positioning
Approach to solving spatial recognition
Error with double integration of acceleration
SD card limits when interfacing with the DE2 board

7. Code Example

8. Test plan
HARDWARE: Read sound from SD Card and output to speakers IMU Self Tests Interrupts from IMU on hit SOFTWARE: Accurate conversion of raw data to drum positioning Amplitude and decay based on “force” Polyphonic sounds (multiple hits at once)

9. Optional Features
Wireless communication
User training game
Laser Harp integration