P18075: Smart Device - Integrated Baby Jumper
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Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

Team Goals - Continuing into Phase 4

Team Accomplishments in Phase 3

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.

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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.

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Energy Harvesting Potential - Team Decision

The pictures below show a prototype of energy harvesting in the form of electromagnetic induction.

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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

Electronic Schematics

MCU Schematic is shown below:

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Power Supply Schematic is shown below:

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LED Interface Schematic is shown below:

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Audio Interface Schematic is shown below:

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Schematics document can be found here.

Input/Output Flowchart

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I/O Flowchart document can be found here.

SOFTWARE DESIGN PLAN

“No battle plan ever survives first contact with the enemy” - Helmuth von Moltke

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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.

Test Plans

List of Tests to be Conducted

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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.

Risk Assessment

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Updated Risk Assessment document can be found here.

Design Review Materials

Pre-read document with meeting agenda and notes from the completed review can be found here.

Plans for next phase

Gantt Chart for Phase 4

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Individual 3 Week Plans


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