Build & Test Prep
Table of Contents
Team Vision for Build & Test Prep PhaseDuring the Build and Test Prep Phase, the group planned to:
- Begin completing tests that do not require system to
be fully built:
- Sensor Accuracies, System Size, Storage Capability
- Begin testing electrical system components and
- Test raspberry pi and purchased sensors.
- Order remaining electrical and mechanical components needed before build.
- Analyze risks of the system and work to mitigate several of these risks.
- Begin a problem tracking document to keep track of risks that have become problems for the team.
- Create plan for when manufacturing of composter will be completed and begin construction when parts arrive.
- Disassemble last years composter for parts.
- Help with electrical layout in shed to make sure our components are being placed as designed.
- Meet with customers regularly to discuss project progress and questions.
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 OverviewThe 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.
Electrical SubsystemThe 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.
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:
- Setup & Test Indoor Temperature Sensor with data collection.
- Setup & Test Outdoor Temperature Sensor with data collection.
- Setup & Test CO2 Sensor with data collection.
- Combine all the sensor code and run collection tests of different durations.
- Setup & Test relay control through Raspberry Pi GPIO.
- 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:
- Allows for the sensor to be placed inside the composter, in the event that only the composter is able to be heated due to power constraints.
- Minimizes error when comparing indoor and outdoor temperatures when data is recorded.
Test Plan SummaryThis 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:
- Composter/Shed Size
- Volume of Input
- Accuracy of Sensors
- Larvae Migration Tests
To see a more detailed breakdown of each planned test: Test Plan Data Sheets
Problem TrackingA 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:
Risk AssessmentThe 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.
Plans for next phaseThe 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.
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.
- Bottom Layer Removal
- Height Adjustment
- Lid Adjustment
- Strengths Test
- Add Frass Bin
A copy of the corresponding purchase plan has been included below:Purchase Plan Document.
During the Subsystem Build and Test Phase, the group will deliver the following items:
- RasPi code related to Indoor/Outdoor Temperature and
Humidity Sensors completed and allows for accurate sensor
- Indoor Temperature
- Outdoor Temperature
- Humidity (may not be proved out until Friday 2/23)
- Commentary documenting the current state of relay implementation for the above sensors, supplemented with a plan for completion of the first relay system by 2/24.
- Raw materials will be purchased for the manufacture,
as well as the completion, of the following parts:
- 002-01 (Front/Back wall)
- 002-02 (Swim lane insert)
- 002-03 (Bottom plates)
- 002-04 (Side plate)
- Best Case: Brackets (002-06 through 002-09) and Bottom Layer Hinges (002-10) completed
- First batch of test plans (those not related to the
building of the reactor) will be completed with
- SZ1, SZ2, SZ3, SZ4, SZ6
- IN1, IN2
- LF1, LF2, LF3,
- CN4, CN5, CN6, CN7
- CAD design will be completed to reflect the desired deliverables, as confirmed with project stakeholders
- Updated documentation related to project
- Budget Maintenance
- Project Plan
- Risk Management
- Problem Tracker
- Process improvements for the system will be formalized and implementation plan created
- Documentation for the above items will be available on the team’s MSD EDGE page
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.