P18422: Black Soldier Fly Composting Habitat Improvement

Build & Test Prep

Table of Contents

Team Vision for Build & Test Prep Phase

During the Build and Test Prep Phase, the group planned to:

The majority of the above items were successfully completed during this phase; however, the group suffered from an unexpected loss of a team member from the project. It was discovered that Dan, the 3D Modeling Lead, will not be returning to MSD2 to help complete the project. This created an immediate issue to the group, as the 3D models needed to be recovered and understood by another member of the team in order for them to be updated. The following section of this page document the work completed in the first two weeks of MSD2 that include the items listed above as well as additional work necessary to re-structure the team responsibilities.

Project Overview

The Engineering Requirements Flow Summary document was created by the team as a means of explaining how the current proposed design meets the needs of the project with respect to engineering and customer requirements.

To be confirmed with the various stakeholders, a finalized list of project deliverables and a vision for the Imagine RIT event has been created. These items can be found in the Finalized Deliverables document.

Small changes were made to the Bill of Materials in light of the team reviewing the work from MSD1. Specifically, the sourcing of items has been updated to reflect recognized sources in good standing with the MSD office. Some prices have changed and, in addition, extra steps have been taken to cost-justify the current proposed design. The below image also vaguely illustrates where money will be taken from, which will be further finalized once budget information has been provided to the team.

BOM and Budget

BOM and Budget

Electrical Subsystem

The Raspberry 3 schematic shows the allocated connection between the sensors and the microcontroller. The 3 wire sensor has connections for power (3.3V), signal (GPIO 4), and ground. The 4 wire sensor has connections for power (3.3V), signal (GPIO 17 & 5), ground, and a shared clock (GPIO 11). The outdoor sensor requires a 10k ohm resistor connected in series with the the signal wire to create a smoother flow of communication.
Wiring Schematic for Electrical Subsystem

Wiring Schematic for Electrical Subsystem

In order to get the hardware to gather the data, code must be written to gather and record the data from the sensors then send a signal out to the relays to turn on or off the intended equipment.

In this phase, the process to connect the temperature sensors was started. The current setup and test phases are:

  1. Setup & Test Indoor Temperature Sensor with data collection.
  2. Setup & Test Outdoor Temperature Sensor with data collection.
  3. Setup & Test CO2 Sensor with data collection.
  4. Combine all the sensor code and run collection tests of different durations.
  5. Setup & Test relay control through Raspberry Pi GPIO.
  6. Combine all components and run tests with completed composter in the shed.

Currently, the Indoor Sensor is unable to connect to the Raspberry Pi. Further documentation is noted in the Problem Tracking section. The next phase will be executed in the meantime to try and stay on schedule. If the Outdoor Sensor works properly, an identical sensor will be purchased to replace the current Indoor Sensor.

Replacing the current sensor may also provide additional benefits:

Test Plan Summary

This phase we added in a Test Plan Tracker. This tracker shows the timeline that we propose to complete each of our tests. It also is one easy source that will tell you which tests have passed/failed and which are still in progress.

Next phase we plan to start some of these tests including:

To see a more detailed breakdown of each planned test: Test Plan Data Sheets

Problem Tracking

A problem tracking document was created by the team in order to capture current roadblocks faced by individuals within the group. These issues have been recorded and the problem solving structure of this document has allowed members to systematically work to resolve problems.

Noted on the tracker below, it can be noted that the MSD group lost a team member. Roles and responsibilities were adjusted accordingly after a team discussion. Another problem that has come to light is one related to the RaspberryPi. Please see below for the current status of this unresolved issue:

Problem Tracker

Problem Tracker

Risk Assessment

The team reviewed and updated the cumulative Risk Assessment that was first created in the Problem Definition phase of the project (and has been updated during every project phase thus far). It is important to note that Risk REN2 was successfully mitigated and, thus, removed from the below table. Please review the Planning and Execution page of the project site in order to gain additional information on this.
Risk Matrix

Risk Matrix

As this phase progressed, it also became aware to the group that risks experienced changes to their impact values. A new risk(RRS9) was also added to the matrix. Please see the above table for the most up-to-date risk considerations. The figure below is meant to be a visual representation of these changes:
Risk Deltas

Risk Deltas

Plans for next phase

The link below shows the proposed manufacturing timeline. This is subject to change as more part files from CAD are added in as well as when Ian's time is freed up and can assist Melissa with machining. Manufacturing Timeline Document.
Manufacturing Timeline

Manufacturing Timeline

The first part of the composter that is planned to be built is part of the main body including the swim lanes. This will be created out of the scrap plastic from last years composter. We have a schedule of when we need to order the next shipments of plastic in order to follow the principles of JIT (just in time).

With Dan missing this semester, Ian has taken over as CAD lead in order to finish up the last few pieces of the composter. Click the link below for greater detail on the remaining pieces to be added.

Needed CAD Parts

A copy of the corresponding purchase plan has been included below:

Purchase Plan

Purchase Plan

Purchase Plan Document.

During the Subsystem Build and Test Phase, the group will deliver the following items:

Build & Test Prep Plan

Build & Test Prep Plan

Link to our MSD Project Plan file.

The overall work breakdown plan (WBS) for the Subsystem Build and Test Phase can be found below. The WBS of who is planning on working on specific tasks is highlighted in the Team and Individual Visions document.

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