Customer Handoff & Final Project Documentation
Table of Contents
Team Vision for Final Demo and Handoff
|Finish assembling and testing the entire system.|
|Complete enough testing to ensure data fidelity of the counter, temperature sensor, and soil moisture sensor.|
|Review the rate of false positives with Ed and Sarah to ensure an acceptable rate.|
|Finish waterproofing the box.|
|Finish Excel macro to display data easily.|
|Fabricate/solder board if necessary.|
|Write recommendations for future MSD teams to improve upon our design.|
|Finish user and build manuals.|
|Hand functioning prototype off to Sarah.|
Test Results SummaryThe complete excel file containing the test plans and results can be found at the following link: Test Plans
The above graphs show the change in voltage coming from one pack of 3 AA batteries. The first two tests had the pack powering the ATMega328p chip, SD card, temperature and soil moisture sensors. The third test had all this with the motion and pressure sensors added. This allowed us to ensure that the power drain would not be significantly different with the complete system.
There was not enough time to run the third test as long as the first two, only 9 days compared to the 14+ days of the others. At this point the voltage was 3.8V, well above the 3.3V threshold required to run the sensors. The three tests create nearly identical curves, indicating that they are an accurate indication of the battery life of the system.
The above chart shows the testing of the temperature sensor at high temperatures, according to engineering requirement S6. As can be seen, the accuracy of the sensor decreases at higher temperatures, giving a greater error. If the pit contents are composting, an expected high temperature would be 65 degrees Celsius, or 149 degrees Fahrenheit. The error recorded for this value still meets the marginal accuracy requirement. The error shown is assuming that the gun is 100% accurate.
|CR||ER#||Importance||Description||Metric||Direction/Range||Target||Marginal||Comments||Test Plans||Concluded Condition|
|1.1, 2.5||S1||9||Percent of new users who detect system||%||Decrease||0||<5||None||S1 Test Plan||Unfulfilled|
|1.2||S2||9||Percent of grid electricity required (any point in system)||%||Decrease||0||<5||No grid electricity available||S2 and S3 Test Plan||Fulfilled|
|2.1, 3.1||S3||3||Time system can be used without interruption||days||Increase||>90||>30||None||S2 and S3 Test Plan||Fulfilled|
|2.1||S4||3||Number of data points can be collected by counter||number||Increase||9999||999||None||S4 Test Plan||Fulfilled|
|2.2||S5||9||Detects temperature with reasonable accuracy||C||Range||+/- 1||+/- 3||We don't know the accuracy of the control.||S5 and S6 Test Plan||Not Complete|
|2.2||S6||3||Maximum temperature that can be monitored||C||Increase||>80||>70||None||S5 and S6 Test Plan||Not Complete|
|2.3||S7||9||Accuracy of pH reading||pH||Increase||+/-0.1||+/-0.5||None||S7 and S8 Test Plan||Fulfilled|
|2.4||S8||9||Range of pH reading||pH||Range||2-10||4-8||None||S7 and S8 Test Plan||Fufilled|
|2.4||S9||9||Accuracy of moisture reading||%||Range||+/-0.01||+/-0.1||None||S9 and S10 Test Plan||Unfulfilled|
|2.4||S10||9||Range of moisture reading is 0-100% (relative)||binary||_||yes||yes||None||S9 and S10 Test Plan||Fulfilled|
|2.5||S11||0||Accuracy of oxygen reading||%||Range||+/-0.01||+/-0.1||Unfeasible||n/a||Unfulfilled|
|2.5||S12||0||Range of oxygen reading||binary||_||yes||yes||Unfeasible||n/a||Unfulfilled|
|2.2, 2.3, 2.4, 2.5||S13||3||Frequency of pit readings||number/day||Increase||24||6||None||S13 Test Plan||Fulfilled|
|3.2||S14||3||Number of times the system can be reused||number||Increase||>100||>15||None||S14 Test Plan||Fulfilled|
|3.3, 3.7||S15||1||Time it takes to set-up the system||minutes||Decrease||<30||<60||None||S15 Test Plan||Fulfilled|
|3.4||S16||1||Time it takes to tear down the system||minutes||Decrease||<10||<20||None||S16 Test Plan||Not Complete|
|3.5||S17||3||Time it takes to record data||minutes||Decrease||<10||<30||None||S17 Test Plan||Fufilled|
|3.5||S18||9||Cost of equipment to record data||USD||Decrease||<20||<50||Not including laptop or phone||n/a||Fulfilled|
|4.1, 4.3||S19||3||Cost of power system over 1 year||USD||Decrease||<15||<100||Based off price of a pack of AA batteries||n/a||Fulfilled|
|4.2||S20||9||Cost of total system||USD||Decrease||<400||<1000||None||n/a||Fulfilled|
|4.3||S21||3||Cost of consumable parts||USD||Decrease||<15||<30||None||n/a||Fulfilled|
|5.1||S22||9||Percent of parts exposed that are not weather resistant||%||Decrease||0||<10||Internal components do not need to be weather resistant||S22 Test Plan||Fulfilled|
|5.2, 5.3||S23||3||Shortest lived part||years||Increase||>3||>1||Fatigue calculation if mechanical part is used. Can be batteries||S3 Test Plan||Not Complete|
|5.3||S24||9||Percent of parts that are corrosion resistant exposed to pit||%||Increase||100||>90||None||S4 Test Plan||Fulfilled|
|2.1||S25||9||Percentage of uses the system registers and counts||%||Increase||100||>90||None||S25 and S26 Test Plan||Not Complete|
|2.1||S26||9||Percentage of false positives the system counts||%||Decrease||0||<10||None||S25 and S26 Test Plan||Not Complete|
- Green = Engineering Requirement fulfilled by testing.
- Yellow = Engineering Requirement is theoretically fulfilled.
- Red = Engineering Requirement will not be satisfied.
Final Project DocumentationThe poster can be found at the following link: Poster
The technical paper can be found at the following link: Technical Paper
The electrical build manual can be found at the following link: Electrical Build Manual
The mechanical build manual can be found at the following link: Mechanical Build Manual
The field worker manual can be found at the following link: Field Worker Manual
The Excel Sheet that will convert data into meaningful graphs can be found at the following link: Excel Sheet with Macro
Plans for Next Phase if There was a Next Phase
- Make a mounting device for the pressure sensor that can secure the pressure sensor between the seat and the bucket. The seat has not been finalized by the industrial design team.
- Run the battery test on the full system for the full life of one battery pack.
- Change the screw terminals on the PCB board to connectors.
- Make an end cap design that can be more easily manufactured. Also, connect it to the hose more securely to prevent water from entering.
- Do more research and testing on waterproofing techniques.
- Make the design easier to replicate.
- Perform more full system tests for all of the use cases.
Eren's Three Week Plan - Eren's Goals
Kendall's Three Week Plan - Kendall's Goals
Kiera's Three Week Plan - Kiera's Goals
Saul's Three Week Plan - Saul's Goals
Quinn's Three Week Plan - Quinn's Goals