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OVERVIEW
• The Automated Greenhouse is an microprocessor based self-
sustaining, low maintenance, plug and play, growing system
designed to fit on a shelf.
• This system is intended for people desiring to grow plants without
the hassle of maintaining a garden.
• It will feature internet connectivity, aeroponic watering, fertilizer
control, light scheduling, and climate control.
PROBLEM STATEMENT
• The Automated Greenhouse is a self-sustaining, low maintenance, growing system. This system is intended for people desiring to grow plants without the hassle of maintaining a garden. The Greenhouse will be designed to fit on a shelf and still be large enough to grow most culinary herbs and some fruits and vegetables. The system will have its own supply of water and light to be able to be placed anywhere in the home. The Automated Greenhouse will feature a small display and internet connectivity for human interaction. The user will be able to place their desired seed in the growing medium, tell the system what seed was selected, and the system will do the maintenance for the remainder of the grow. The Automated Greenhouse will have clear acrylic walls so the user can watch the grow for entertainment.
OVERALL SYSTEM
• The Automated Greenhouse
will have an Atmega328p-au
microprocessor.
• The microprocessor will
maintain the systems and
alert the user if needed.
PROJECT REQUIREMENTS
• The Automated Greenhouse will notify the user if it needs water or fertilizer
• The system will measure the Electrical Conductivity (EC) of the solution
• The system will measure the pH of the solution
• The system will mix the fertilizer to the required specification
• The Automated Greenhouse will keep the internal temperature at a set temperature
PROJECT REQUIREMENTS
• The system will turn the lights on and off at specific times
• The system will create a web interface
• The Automated Greenhouse will fit on a countertop
• The system will run off 120 VAC
• The Automated Greenhouse will be reliable
WILL NOTIFY THE USER FOR WATER AND FERTILIZER
• The system will be able to measure the
amount of liquid in the reservoirs for water
and fertilizer. The measurement will be
done with ultrasonic distance sensors which
send out a small pulse of noise and wait for
the response.
• The level of the liquid will be viewable on
the web interface and an LED will illuminate
on the device when the level is less than 20
percent.
WILL MEASURE WATER LEVEL
• pH, Fresh Water, and Fertilizer need to be measured individually.
• The three sensors needed to be hooked up to the least amount of pins since we have used all the pins on the AT Mega chip.
• All three triggers are shorted together and the echo's get their own pin
• Three sonic sensors use four pins of our chip
MEASURING ELECTRICAL CONDUCTIVITY
• Measuring the EC of the
solution will be done with an
electrical conductivity probe
and a circuit to convert it into
a 0-5 volt signal.
• The EC can determine the
amount of fertilizer present
CALIBRATING CONDUCTIVITY
• The EC meter will
need to read samples
from 0-3000 ppm.
• Most indoor plants
fall in this range
MIX FERTILIZER
• The system will mix the
fertilizer based on the user
defined levels.
• The system will use the EC
and pH of the solution to
determine the amount of
each liquid to add.
• The solution will keep a
constant height of the
solution.
MIX FERTILIZER
• Peristaltic pumps are used
to dose the pH and
fertilizer.
• It doses 1 mL after 1.5s at
a 50 percent duty cycle.
CLIMATE CONTROLLED
We are going to use fans to
control the cooling.
If fans do not provide enough
cooling we have the Peltier
modules and code ready.
LIGHTING CONTROLLED
• The light system will be
built from 3 watt LED bulbs.
• The LED lights are efficient
and do not produce much
heat.
• Different lighting schedules
based on plant type.
INTERNET CONNECTIVITY
• The sytem will connect to the internet over
an ESP 8266 2.4 Ghz wifi chip
• The Automated Greenhouse will broadcast a
WIFI signal
• Hardest part of the project
GRAPHICAL INTERFACE
• The system will publish its own web server for the user to
connect to.
• Have not figured this out yet…..
COUNTERTOP SIZE
• The Automated Greenhouse will be
24 inches long, 12 inches deep, and
18 inches tall.
• It will take up 3 cubic feet, roughly
the size of a large microwave.
• It will be visually appealing for
kitchens and visible areas.
POWER
• The Automated Greenhouse will be able to be plugged into a 3 prong
U.S. standard wall outlet.
• It will internally convert all the power to DC for the microprocessor
and electronics.
• The system will use a computer power supply to provide the power.
• The system will use a Ground Current Leakage
detector on the input of the system for safety.
POWER
• Assuming max power use scenarios
• Will have power saving mode to turn off non essential items
ACCOMPLISHED
• EC Circuit
• Code compiles
• Tested MOSFET’s with pumps
• RTC
• pH meter calibrated
• Peristaltic pumps calibrated
• Temperature, humidity, and
sonic sensors are accurate.
NEED TO ACCOMPLISH
• WIFI
• PCB Milling
• Put it all on a breadboard
• Put the frame together
WORK DIVISION
• Jon Rigby: Board Design, Code, Pumps, and Mosfet Circuits.
• Chad Hager: Frame, Documents, and Lighting.
• Both: WIFI, EC, Prototype Wiring.
TEST
• Component:
• pH Probe
• pH Control Routine
• EC Probe
• EC Control Routine
• Lighting Control System
• Reservoir Correction Routine
• Temperature Control System
• Water Level Control System
• Low Level Indicator LED’s
GUI:MenuDisplay ParametersUser InputsWeb Publishing/Viewing
System:Environmental Control SystemUser Interface
TEST
• Electrical Conductivity meter
• Calibrate the EC meter vs an accurate EC meter. Measure various levels
of fertilizer to see if they both give the same reading.
• pH meter
• Calibrate the pH meter vs an accurate pH meter. Measure various liquids
to see if they both give the same reading.
• Temperature meter
• Calibrate the Temperature meter vs an accurate Thermometer. Measure
various room temperatures.
TEST
• Reservoir Control Algorithm
• Set the reservoir pH, fertilizer, and height levels and see if the system
holds them constant. Adjust algorithm as necessary.
• Lighting Algorithm
• Make sure the lights turn on and off at defined intervals.
• Web Interface
• Access the web interface from various devices and operating systems to
make sure it properly displays on all.