Automatic Storm Shutters Automatic Storm Shutters Team: Make It - - PowerPoint PPT Presentation

EEL 4924 (Summer 2009) Date: Tuesday August 4th 2009

Automatic Storm Shutters

Date: Tuesday, August 4th, 2009

Automatic Storm Shutters Team: Make It Rain

Kyle Weber Zachary Wernlund Zachary Wernlund

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Project Overview j

• Storm shutters that

Storm shutters that will actively detect dangerous wind speeds and react by automatically closing

• An anemometer will

be used to digitally track wind speeds track wind speeds and communicate wirelessly with the

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wirelessly with the shutters

System Flow Chart

Weather Station

Rain Gauge Count ticks of

y

Rain Gauge – Count ticks of the reed switch through hardware interrupt, multiply by scaling factor Anemometer – Count ticks of the reed switch through

Xbee

Initialize system

Microprocessor

Atmega 32 g hardware interrupt, use scaling factor to determine the period Wind Vane – Use ADC to get digital value and compare against a table of values T t S U

• Initialize system
• Transmit stored data through

serial UART transmission Atmega 32

• Store data and prepare for

transmission

Serial

Temperature Sensor – Use ADC to read digital value and convert using equation

Serial Communication to Twitter

• Use Microsoft Visual Studio to

create a program that

XBee

• Receive data through serial

UART

Microprocessor

Atmega 32 p g interfaces with Twitter and sends weather status updates at 30 second intervals

Storm Shutter Storm Shutter Control

(Activates motor to lower storm shutter)

User Interface

(LCD and push button)

Weather Station: Sensors

• Anemometer: reed switch where

ticks were counted to determine a period length and converted to MPH from a pre defined factor MPH from a pre-defined factor

• Wind Direction: made use of ADC to

convert voltage level the first 16 divisions

• f the compass (N NNE NE etc )
• f the compass (N, NNE, NE, etc.)
• Rain Gauge: reed switch where ticks are

converted to rainfall in inches by a conversion factor conversion factor

• Temperature: made use of ADC to

convert voltage on a straight scale to Fahrenheit degrees

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Fahrenheit degrees

Weather Station: System y

• Sensors all communicate with the Atmega

Sensors all communicate with the Atmega 32

• Sensor data is converted into serial string
• Sensor data is converted into serial string

and transmitted to the Home Station via wireless communication (through the Xbee wireless communication (through the Xbee wireless module) C i ti i f W th

• Communication is one way, from Weather

Station to Home Station

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Home Station: Components p

• Xbee Wireless Module: receive data from

Xbee Wireless Module: receive data from Weather Station (mounted on roof)

• DC Motor and gear box: Used to drive our mock

g up shutter

• LCD screen: display data in a convenient

p y location

• FTDI Serial Device: used to send our serial data

to the computer

• H-Bridge: used to drive DC motor in proper

direction

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Home Station: System y

• Once data is received is passed through a

Once data is received is passed through a series of mathematical operators to get into readable format for the LCD and for into readable format for the LCD and for transmission through the FTDI to update Twitter Twitter

• If wind speed is over a level defined as

‘DANGER’ the command is issued to DANGER , the command is issued to lower the storm shutter

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Overall Project Status j

• There are slight technical difficulties

There are slight technical difficulties

• Components work on PC board

M t b ilt d i t d

• Mounts are built and painted
• We are finishing making communication

smooth

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