P16414: Toilet Use Sensor
/public/

Detailed Design

Table of Contents

Agenda

Team Vision for Detailed Design Phase

Sensor Testing

Temperature Sensor Test Data

Temperature Sensor Test Data

The soil moisture sensor was tested by measuring the moisture of soil that had been dried out in a furnace so that the moisture was known to be zero percent, which the sensor read correctly. It was also tested using very wet soil, which gave a reading similar to putting it in water, an expected result based on the consistency of the soil.

Thanks to Shwe Win in the Golisano Institute for Sustainability for allowing us to make use of the oven to dry the soil sample.

Arduino Chip Schematic

public/Photo Gallery/Detailed Design Photos/Arduino Chip Schematic.png

public/Photo Gallery/Detailed Design Photos/Arduino Chip Schematic.png

Bill of Material (BOM)

Bill of Materials

Bill of Materials

Budget

Budget

Test Plans

Test Plans

Test Plans

Summer Feasibility Testing

Over the summer, we are planning on performing a feasibility test of a preliminary prototype. For this, we have dug a pit with a diameter of 20 -24 inches and a depth of 40 inches or 1.016 meters. The temperature and soil moisture sensors will both be placed in the pit and connected to the microcontroller chip. The wire connections will be fed through a hose for water proofing; a sealed hole in the container will allow the wires to enter the container.

Rather than using the entire Arduino Uno board, only the chip, the AT Mega 328p-PU, will be utilized in order to save power, which is something we believe may be an option in the final product. For the feasibility testing, a breadboard will be used for all of the connections to the chip and a 9 volt battery will provide the power for the test period.

Though further testing of the motion sensor that will be used to count the use is required, it will not be a part of the feasibility testing over the summer. The team agrees that it is not as important to test the motion sensor in the simulation and time is running short to complete the prototype and install the module at the test site. The temperature and soil moisture sensors both require more testing in the pit to ensure their durability, while the motion sensor will be less exposed and require less testing in this respect.

Over the summer our guide, who graciously offered his yard for the test, will follow a given script and add things to the pit, such as water, to provide a full range of conditions for the test. A log will be kept of everything that is done to the pit. The weather will also be monitored.

Meter Deep Pit

Meter Deep Pit

Full Setup

Full Setup

Full Setup

Full Setup

Update on May 22, 2016

During the gate review on May 18,2016, the summer test system was completed for installation. The test plans can be found at the following link: Feasibility Test Plans.

Initial Conditions:

First Dump:

Notes:

Room for Future Improvement:

Initial Pit

Initial Pit

Pit After Dump

Pit After Dump

Water Proofed End Cap and Sensors

Water Proofed End Cap and Sensors

Mechanical Engineer Saul Holding the Complete System

Mechanical Engineer Saul Holding the Complete System

Risk Assessment

Risk Assessment

Risk Assessment

Plans for next phase

Purchasing Plans

Team is currently pleased with our soil moisture and temperature sensors. We will need to purchase a different motion sensor and thinking about a way to couple it with another sensor to count usage. We are also going to look into testing the PH sensor more extensively. If we aren't pleased with the results, we will be looking into purchasing a different sensor. We are currently pleased with the junction box, but we might be able to use a smaller box instead.
Ed's Dogs

Ed's Dogs

Ed and His Dogs

Ed and His Dogs


Home | Planning & Execution | Imagine RIT

Problem Definition | Systems Design | Subsystem Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Integrated System Build & Test with Customer Demo | Customer Handoff & Final Project Documentation