Integrated System Build & Test

Table of Contents

1 Schedule Moving into Phase
2 Team Vision for Integrated System Build & Test Phase
3 System Assembly Schematic, Simplified
4 Risk and Problem Tracking
5 Customer Requirements Update
6 Budget Exhaustion Analysis
7 Mechanical Updates
8 Functional Demo Materials
9 Plans for next phase

Schedule Moving into Phase

Schedule

Team Vision for Integrated System Build & Test Phase

Planned to Complete:

Integrate subsystems and play a song remotely
Re-design plunger cap per customer request
Protocol established
Begin completing test plan
Continue poster design

Completed:

Flyback Diodes placed in circuit
System assembled and wired
Plunger cap designed and implemented
System wired and each individual solenoid fires

System Assembly Schematic, Simplified

Risk and Problem Tracking

Problem Tracker Critical

Problem Tracker Major

Problem Tracker Ordinary

Problem Tracker

Risks Table

. Risks

Customer Requirements Update

Customer Requirements

Budget Exhaustion Analysis

The budget for this project has been completely exhausted. After the MSP432s used in our prototyping were destroyed, we have been forced to replace them. That cost depleted our funds. The team has all the materials it needs and is ready to face any further problems head on. Below is the list of all components the team has purchased through MSD 1 and 2. Items highlighted in yellow were the biggest hits to budget that were not forseen, or were parts not used in the final design.

1. 36V Power Supply- The team worked to make the previous teams 48V power supply work with our design, but unfortunately such high voltage routinely destroyed components in the electrical actuation system (particularly the MOSFETs).

2. 24V Solenoids- These solenoids were used in our proof of concept design in senior design 1. They are on this list because the cost to order them quickly through Amazon is 4 times as high as the cost per solenoid that the team would spend purchasing all 24 solenoids.

3. 24V Solenoid- This solenoid was one of the first ones the team purchased for R&D, it cost the team 3 times the cost per unit of the ones used in the final design.

4. 24V Small Solenoid- This solenoid was tested but found to be too small to be able to pull a piano key effectively.

Mechanical Updates

Plunger Cap Re-Design per Customer Request

Easy to adjust
No risk of 3-D printed threads stripping
Increased endurance
Wire centered on plunger

Slide wire through front hole and out side hole
Insert socket cap screw from top and nut from bottom into hexagonal shaft
Tighten screw effectively sucking nut to top of shaft securing the wire

Installation Procedure

Wire to piano clips installed and draped over dowel rod
Board inserted and mounted
Wires inserted into plunger cap
Adjust wires to length
Tighten socket cap screw

Potential Mounting Method for Future Teams

Locking hinge creates outward forces locking plate in place
Too bulky for space constraints of this piano

Functional Demo Materials

Transmitting from high-level controller

MIDI is converted to JSON format
JSON is split into individual bytes (4 per note)
Serial port is opened to first MSP432
- Pi sends command to MSP432 to notify of incoming data
  - Pi sends note
  - MSP432 responds with acknowledgement
Process repeats for remainder of notes
- MSP432 checks integrity of data against that specified in original command
Serial port for next MSP432 is opened, and the process repeats

Transmission Protocol

Mode, Note, Intensity, Duration, Time
- Mode A -> Information
- Mode B -> Command
Note -> Which note to be triggered
Intensity -> The “Loudness” of the note
Duration -> The duration of the note in milliseconds
Time -> The start time of the note in milliseconds
Conversion can happen between any number of “tracks” in midi that are selected and can be filtered with relative ease