MICROCLIMATE CONTROL SYSTEMIsm AlfreaqRyan HoffmeierEric-Todd Anderson Kevin WrayRuwaybih AlsulamiMohammed Alattas

PROJECT OVERVIEW

Develop a climate control system for easy maintenance of multiple terrariums/aquariums

Easy to use user interface with possible extensions to the internet

Monitor various aspects of the environments with sensors

Control environments autonomously Presentation of current system status on LCD

screens Possible extension to larger environment

Room in house, indoor stadium, bio-dome

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OBJECTIVES

Monitor and control environmental variables Temperature (heaters/fans) Humidity (mister) Lighting (lamps) CO2 (CO2 tanks)

Multiple sensor boards to monitor individual environments

Display current status on LCDs Easy to use user interface via local computer Interchangeability of peripheral devices

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Microclimate Control SystemClimate Variables

Climate Control

User Interface

Module Microclimate Control System

Inputs -Climate Variables: input from sensors-Power: 120 VAC rms, 60Hz-User Interface: desired climate variables

Outputs -Peripheral Devices: adjust climate variables-User Interface: display climate variable values

Functionality Read in climate variables from sensors, display values on user interface, control peripheral devices so that the environment's variables match user input

Power

LEVEL 0

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LEVEL 1

Sensor Boards

Power Supply

Central Control Unit

Peripheral Devices

User Interface

ClimateVariables

ClimateControl

Power

Climate Values

Desired Values

Per

iphe

ral

Con

trol

6VD

C,

1A

120VAC

12VDC, 1A R

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LEVEL 1.1Module Sensor Boards

Inputs -Climate Variables: input from sensors-Power: 6VDC, 1A wall wart-Desired climate values from CCU

Outputs -Climate values: CO2, ambient light, temperature, humidity-Peripheral control: ON/OFF signal for each peripheral device

Functionality Sensor board collects information from environment, turns ON/OFF peripherals to meet user’s desired environmental conditions, and sends current climate status to CCU.

Module Peripheral Devices

Inputs -Power: 120VAC with relays controlled by sensor board

Outputs -Climate controlled by use of heater, fans, lights, humidifier, CO2 tank

Functionality Adjusts environmental variables

LEVEL 1.2

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LEVEL 1.3Module Central Control Unit

Inputs -Climate Values: current conditions measured and sent by sensor board-User Interface: user inputs desired environmental conditions-Power: 12VDC, 1A wall wart

Outputs -User Interface: displays current climate conditions-Desired Values: outputs user input to sensor board

Functionality Monitor and control multiple sensor boards from one location

Module Power Supply

Inputs -Power: 120VAC-Peripheral Control: ON/OFF signal for each peripheral

Outputs -6VDC, 1A: sensor board-12VDC, 1A: central control unit-120VAC: peripheral devices based on control signal from sensor board

Functionality Power sensor board and central control unit. Relays control signal from sensor board to peripheral devices.

LEVEL 1.4

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LEVEL 2.1: SENSOR BOARDS

Sensors

6VDC, 1A5V

Regulator

3.3V Regulato

r

ATMega328

DesiredValues

LCD

CO2Ligh

tTemp/Humid

Wi-Fly

ClimateVariables

Climate Values Peripheral Control

RS232

I/O

Digital/Analog I/O

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LEVEL 2.2: PERIPHERAL DEVICES

Fans

Heater Heat

Cooling/AirCirculation

Lights Light

Humidifier

Humidity

Solenoid Valve

CO2 Level

ClimateControl

120VAC(Relay Controlled)

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LEVEL 2.3: CENTRAL CONTROL UNIT

12VDCRCM3400

Dev Board

Wi-FlyClimate Values

Desired Values

User Interface

5VD

C

RS

232

RS232

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LEVEL 2.4: POWER SUPPLY

6V Wall Wart

120VAC

PeripheralControl

12V Wall Wart

120VAC toPeripherals

Sensor Board CCU

Peripheral Relay Control System

12V Power Supply

Relays

Power Strip

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SOFTWARE FLOW DIAGRAM (CCU)

RootRoot

choose tank # or

all

choose tank # or

all

choose tank #choose tank #

get status for all

get status for all

get status for tank #get status for tank #

choose variable to

set

choose variable to

set

set variableset variable

‘P’rogram‘S’tatus

‘Q’uit

‘Q’uit

‘Q’uit

‘tank #’

‘tank #’‘A’ll

‘Q’uit

‘Q’uit

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SOFTWARE: SENSOR BOARD PSEUDO CODELoop:

check sensor 1if out of range:

adjust peripheralcheck sensor 2

if out of range:adjust peripheral

check sensor 3if out of range:

adjust peripheralcheck uart connected to WiFly (CCU)

if new parameters:change climate variables

return current climate status

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Light Sensor

Lights

Heater

Fans

Humidifier

LCD Output

Sensor Board 2

Temp. SensorHumidity Sensor

CO2 Sensor

CO2 Tank

Light Sensor

Lights

Heater

Fans

Humidifier

LCD Output

Sensor Board 1

Temp. SensorHumidity Sensor

CO2 Sensor

CO2 Tank

SYSTEM BLOCK DIAGRAM

Central Control

Unit

User Interface (PC)

NetworkW

iFly

WiF

ly

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CONTROL UNIT MICROPROCESSOR: RCM3400W

Rabbit 3000 microprocessor 30MHz 8 channel 12-bit A/D with programmable gain Up to 47 I/O lines and 5 serial ports 412K Flash/512K SRAM K

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SENSOR BOARD MICROCONTROLLER:ATMEGA328

1.8-5.5V operating range Serial USART 32kB Flash program memory 1kB EEPROM (non-volatile) 2kB Internal SRAM Up to 20MHz

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ATMEGA328 PINOUT

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WIFLY COMMUNICATION

Central Control Unit communicates wirelessly with sensor boards using WiFly

RN-134 “SuRF” board

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SENSORS MG811 – CO2 Sensor

Detects 0.035% to 1% Low humidity and temperature

dependency Needs ADC

SHT71 – Humidity and Temperature Sensor Normal operating range: -20–100oC Digital output Low power consumption

TSL235R – Light Sensor Light to frequency converter 350–1000nm Output frequency: 200–300kHz

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PERIPHERALS

Solenoid valve (CO2) Fans Lights Mister Heater

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POWER (SENSOR BOARDS)

6VDC 5VDC 3.3VDC120VAC

CO2 Sensor (200mA)Wi-Fly (210mA)

ATMega328 (200mA)Light Sensor (2mA)

UART to USB (20mA)

T/H Sensor (1mA)LCD Screen (3mA)

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POWER

Largest power usage through peripherals Sensor board connected to opto-isolator

Isolator allows relay to pass current Keeps high current levels off of sensor boards

Isolation of individual outlets of a power strip Allows for easy exchange of peripherals

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PARTS LIST

Component Quant.

RN-134 “SuRF” board* 3

RCM3400 RabbitCore Devel. Kit* 1

ATMega328 2

Sensors (CO2,Temp/Humidity, Light) 6

UART to USB IC 2

Resistors/Capacitors/Diodes ~75

Regulator/Power Supplies 8

Relays 10

Opto-isolator 10

LCDs 2

Peripherals 9

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DIVISION OF LABOR

Task Ryan Eric Kevin Rob Mohammed

Sensor Board Design X X

Program Sensor Board X X X X

Sensor Board PCB X

LCDs X X

Wi-Fly X X

Power Board X X

Sensors X X X

Program CCU X X X

Documentation X

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SCHEDULE

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SCHEDULE HIGHLIGHTS

Milestone I Parts interfaced with Arduino board Power strip control boards completed

Milestone II Sensor boards completed Sensor boards interface with CCU User interface completed

Expo Documentation completed Expansions?

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QUESTIONS?