P16414: Toilet Use Sensor

Systems Design

Table of Contents

1 Agenda
2 Team Vision for System-Level Design Phase
3 Systems Architecture
4 Functional Decomposition
5 Engineering Requirements Mapping
6 Morphological Chart
7 Selection Criteria
8 Benchmarking
9 Concept Development
10 Risk Assessment
11 Plans for Next Phase

Agenda

Introduce Team Memebers
Team Vision for System-Level Design Phase
Systems Architecture
Functional Decomposition
Engineering Requirements Mapping
Morphological Chart
Selection Criteria
Benchmarking
- Trigger
- Temperature Sensor
- Oxygen Sensor
- Humidity Sensor
- PH Sensor
Concept Development
Risk Assessment
Plans for Next Three Weeks
Questions

Team Vision for System-Level Design Phase

From our project timeline, we were going to research various power options, counter options, environmental conditions and options, and draft system options. This was all to be done before our system review.

What we did accomplish during this phase was create a functional decomposition to better show what each part of the project does. We created a morphological chart to show many options for each task our project needed to accomplish. Selection criteria was determined and we each did some preliminary benchmarking for the different sensor categories. Then we sketched some basic concept development and system architecture. Finally We created a table of risks and the project timeline for the next 3 weeks.

Systems Architecture

Risk Management

Functional Decomposition

Engineering Requirements Mapping

Engineering Requirements Template

The live link is available below:

https://edge.rit.edu/edge/P16414/public/Problem%20Definition%20Documents/Engineering%20Requirements.JPG?

Morphological Chart

Selection Criteria

Can be accomplished in two semesters.
Inexpensive to duplicate.
Compatible with Arborloo design.
Resistant to environmental conditions.
Discrete device.
Accurate measurements.
Easy to build many models.
Easy to install and uninstall.
Easy to retrieve data.
Uses power efficiently.
Has easily reparable parts.

Benchmarking

Trigger

Trigger Benchmarking

Advantages and Disadvantages of Trigger Sensors

Temperature Sensor

Temperature Sensor Benchmarking

Advantages and Disadvantages of Temperature Sensors

Oxygen Sensor

Oxygen Level Sensor Benchmarking

Advantages and Disadvantages of Oxygen Level Sensors

Humidity Sensor

Humidity Sensor Benchmarking

Advantages and Disadvantages of Humidity Sensors

PH Sensor

Research has shown that constantly monitoring the pH of the pit contents is unfeasible. Reasons for this include the fact that most pH sensors are not intended for direct measurements of solids such as soil, and those that are expensive, unreliable and/or need to be cleaned and stored properly between each measurement. A possible solution may be to have the field worker acquire samples each time they visit the test site, and perform the pH level measurement elsewhere. The current sensor research, included below may still be applicable to this.