Preliminary Detailed Design
Table of Contents
Team Vision for Preliminary Detailed Design PhaseTeam Goals - Continuing into Phase 4
- Continue feasibility testing on energy harvesting
- FINALIZE decision (energy harvesting or not)
- Develop circuit design
- Develop UML
- App prototyping
- Control serial signal using application microcontroller
- Look at efficiency of current system
- Identify areas for improvement
- Reverse engineer product
- Look for areas to add in additional stimuli
- Finalize stimuli choices - what exactly do we want lights/music/toys to do
- Develop pseudocode for microcontroller
- Generate BOM
- Model toys in CAD and modify based on proposed additions
- Develop Test Plans
Team Accomplishments in Phase 3
- Generated more accurate estimations of energy harvesting potential
- Generated preliminary circuit design
- more detailed design will be possible after deciding on components
- Started developing UML
- Looked at current components and identified areas for
- e.g. sound production
- Identified opportunities for additional stimuli
- Sun toy
- Frog toy
- Make lights on main platform into buttons
- Generated portion of BOM based on components that have already been decided on
- Began to model toys in CAD and show modifications that will need to be made
- Developed rough test plans based on Engineering Requirements
Prototyping, Engineering Analysis, Simulation
Assess Current State
Continued feasibility included hooking up an oscilloscope to the device to measure the average power consumption for the device's current state. We measured an average power consumption of 180 mW and used this value as a reference when developing the Engineering Requirements. The goal is to stay as close to the current power consumption value as possible, as reflected in ER#11 on the Problem Definition page. The pictures below show a similar test when the team hooked the device up to a multimeter.
IOT Proof of Concept
The videos below shows a team member's feasibility to control a virtual LED with a physical button as well as control a physical LED with a virtual button. The team member used a Raspberry Pi microcontroller and a webpage to simulate controlling an LED using a smartphone.
Energy Harvesting Potential - Team Decision
The pictures below show a prototype of energy harvesting in the form of electromagnetic induction.
The prototype shown above, and variations on it were used to experiment with energy harvesting. Different configurations of coils and magnets were tested to try and improve the efficiency of the generator compared to a more typical shake flashlight design. Some of these configurations resulted in efficiency improvements.
Experimentation and data collection on energy harvesting was halted because the group has decided to remove energy harvesting from our requirements. This is because the other features we are trying to implement will take considerable engineering effort and provide more value add to the project than energy harvesting which would also take a lot of engineering effort.
Drawings, Schematics, Flow Charts, Simulations
MCU Schematic is shown below:
Power Supply Schematic is shown below:
LED Interface Schematic is shown below:
Audio Interface Schematic is shown below:
Schematics document can be found here.
I/O Flowchart document can be found here.
SOFTWARE DESIGN PLAN
“No battle plan ever survives first contact with the enemy” - Helmuth von Moltke
The prototypes/phases for software development as mentioned in the above diagram are as follows:
Prototype 1: Android Application Serial Communication
Prototype 2: Android Application Card Display
Prototype 3: Sync to Database
Prototype 4: Microcontroller Output Control
Prototype 5: Audio Output Android
Prototype 6: Audio Output from Microcontroller
Prototype 7: Final Data Processing Implemented
Prototype 8: Final User Interface Completed
Phase 9: Polishing Work
Phase 10: Release
CAD Renderings and Parts for 3D Printing
CAD models of jumper components can be found on the Mechanical Drawings page.
Bill of Material (BOM)
The most current version of the BOM can be found on the Detailed Design page.
List of Tests to be Conducted
Test Procedures and Information
A description of the tests listed above that are not described by ASTM standards can be found here.
Federal Regulations and Testing Standards
Our product falls within ASTM F2012 - 16: Standard Consumer Safety Performance Specification for Stationary Activity Centers. The document describing theses specifications can be found here.
Updated Risk Assessment document can be found here.
Design Review MaterialsPre-read document with meeting agenda and notes from the completed review can be found here.
Plans for next phaseGantt Chart for Phase 4
Individual 3 Week Plans
- 3 week plans for Phase IV can be found here.