Strawberry Hydroponics with Monitoring System Design System Review

Agenda● Team Vision● Updated Customer Requirement ● Updated Engineering Requirement● Functional decomposition● Benchmarking● Nutrient Requirement● Morphological chart● Selection criteria● Pugh Chart: Structural

○ Structural○ Piping ○ Protection

● Concept Development ○ Mechanical design A○ Mechanical design P

● Feasibility ○ Draft BOM○ Pump/Reservoir Sizing○ Electrical Break-down BOM

● Prototype build design● System Architecture ● Electrical System Design● Monitoring system

○ Flow/Pugh chart○ Microcontroller○ Ethernet Shield○ Display

● Sensors Selection● Prototype Design● Risk Assessment ● Gantt Chart● Three Week plan

Team Vision ● Rough system level design drawn out

● Electrical sensor list

● Micro-Controller selected

● Control system flow chart

● Cost analysis list for components

● Begin prototype implementation

Updated Customer Requirements

Updated Engineering Requirements

…

Functional Decomposition

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Functional Decomposition

Concept Selection: Morphological Chart

Benchmarking Table

Benchmarking: A Frame

http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1108&context=braesp

Nutrient Requirements

Morgan, Lynette. Hydroponic Strawberry Production. Suntec (NZ), 2006.

Benchmarking: A-Frame

https://www.youtube.com/watch?v=VLMLt1UIPEU

Concept Selection: Selection Criteria

● Cost

● Easy to build

● Low risk of crop failure

● High quality berries

● Plant productivity

● Easily expandable

● Simplicity

● Customer Accessibility

● Easy to maintain

● Safe

Mechanical Monitoring System

● Cost● Inputs (Analog/Digital)● Ethernet● Operating Voltage● Programming Environment

Concept Development Pugh Chart: Structural

Concept Development Pugh Chart: Piping

Concept Development Pugh Chart: Protection

Concept Development: Mechanical Design P

Concept Development: Mechanical Design A

Key Features:

1.) Three rows on each side

2.) Adjustable angle of channels

3.) A-Frame structure

4.) Buried Reservoir

5.) Parallel flow

6.) Square channels

Concept Development: Structure

Concept Development: Pipe Functionality

Concept Development: Channel Flow

Concept Development: Pipe Angle Adjustment

Concept Development: Cover

Feasibility: Draft Bill of Materials

Feasibility: Pump and Reservoir Sizing

Feasibility: Total Cost of Electrical SystemPeripheral Quantity Cost

Microprocessor 1 $40.00

Ethernet Shield 1 $25.00

Water Level Sensor Pack of 5 $9.34

Water Temperature Sensor 1 $9.95

Water Flow Sensor 1 $9.95

pH Sensor 1 $110.00

Conductivity Sensor 1 $6.00

pH and Conductivity Handheld Probe

1 (optional) $199.00

Total $409.24 (pretax & shipping)

System Architecture

Power Supply

Pump

Water flow Sensor

Temp Sensor PH sensor EC sensor

Ethernet

Water Level Sensor

Microcontroller

Water Temp Control

Electronic System Design

Monitoring System: Flow ChartRead Measurement Values

Check Measurement values

Is value within limits?

Display Measurements

Alert User

NO YES

Pugh Matrix: Microcontroller Subsystem: Microcontroller

Concepts

Selection Criteria Arduino Mega 2560 Raspberry Pi 3 Elegoo Mega Snickerdoodle MSP430

Cost

DATUM

+ + - +

Analog Inputs - 0 - -Digital Inputs - 0 + 0

Memory + 0 + 0

0 0 0 0

- - - -

Ethernet + 0 + -

Clock Speed + 0 + -

Operating Voltage 0 0 0 0

Require ADC - 0 0 +Sum +'s 4 1 4 2

Sum 0's 2 7 2 4

Sum -'s 4 2 3 4

Net Score 0 0 1 -1

Rank T1 2 T1 4

Monitoring SystemMicrocontroller: Arduino Mega 2560

● Analog Pins: 16● Digital Pins: 54● Can monitor multiple modules● Connection to Ethernet:

○ Ethernet Shield v2

● Acts as a web server:○ Can be access by a computer or phone

https://store.arduino.cc/usa/arduino-mega-2560-rev3

Monitoring System: Ethernet Shield● Allows an Arduino Board to connect to the internet● Supports up to eight simultaneous socket connections● Onboard micro-SD card slot

○ Can be used to store files

● On-board LEDs:○ 100M

■ Indicates the presence of a network connection○ ACT

■ Flashes when RX or TX activity is present

https://store.arduino.cc/usa/arduino-ethernet-shield-2

Monitoring System: Display● Module Number

○ Identifies module if an error occurs

● Water Temperature ● Water level● pH● Conductivity● Water Flow

https://www.webdesignperth.com.au/google-display-network-advertising/

Sensor Selection: Water Level Sensors

Options:

1.) Optomax Digital Liquid Level Sensor - $24.952.) MILONE Water Level Sensor - $39.953.) UxCell ZP4510 - $9.34 for 5

https://www.adafruit.com/product/3397https://www.sparkfun.com/products/10221https://www.amazon.com/uxcell-Pieces-ZP4510-Vertical-Switches/dp/B00FHAEBIA/ref=sr_1_4?ie=UTF8&qid=1507054366&sr=8-4&keywords=water+level+sensor

Sensor Selection: Water Temperature Sensors

Options:

1.) Waterproof DS18B20 Digital Sensor - $9.952.) 10K Precision Epoxy Thermistor - $4.00

https://www.adafruit.com/product/381https://www.adafruit.com/product/372

Sensor Selection: Water Flow Sensors

Options:

1.) Liquid Flow Meter Plastic Housing ½ inch - $9.952.) Cynergy 3 FS22A - $23.81

https://www.adafruit.com/product/828https://www.digikey.com/products/en?keywords=Cynergy%203%20FS22A

Sensor Selection: pH Level Sensors

Options:

1.) Analog pH Sensor - $29.502.) Atlas Scientific pH Sensor - $72.00 (will also require EZO pH circuit - $38.00)

https://www.dfrobot.com/product-1025.htmlhttps://www.atlas-scientific.com/product_pages/probes/ph_probe.html

Sensor Selection: Conductivity Level Sensors and Potential AlternativesOptions:

1.) GroLine Waterproof Portable pH and Conductivity Meter - $199.002.) Homemade Sensor - Cord is $6.00

http://hannainst.com/hi9814-ph-ec-tds-multiparameter.htmlhttps://hackaday.io/project/7008-fly-wars-a-hackers-solution-to-world-hunger/log/24646-three-dollar-ec-ppm-meter-arduino

Prototype Build Design

Potential Risks Looking Forward

Plans for Next Phase

Individual Three Week Plans: Nate:

● Help with testing homemade conductivity sensor ● Housing for electrical components (chassis for power box)● Power conversion/distribution

Ryan:

● Assist with the construction of the prototype● Build CAD models for the design

Individual Three Week Plans: Kevin:

● Buy supplies for prototype build ● Begin construction on prototype● Begin refining mechanical engineering drawings (CAD) ● Calculate size for air pump.

Ray:

● Purchase a cable for testing conductivity sensor implementation● Work with purchase coordinator to finalize a list of sensors and equipments

for sensor implementation.

Individual Three Week Plans: Jerry:

● Finalize list of equipments(BOM) ● create wiring diagram for monitoring system● pseudo-code for the microcontroller

Thierno:

● Focus on subsystem electrical design● wiring diagram and connection

Questions?