This document describes the design of a water control system. It includes specifications for the hardware and software design. The hardware design uses an LCD display, keypad, humidity sensor, and microcontroller. The microcontroller handles the push buttons, LED display, timer functions, and communication. The software design uses a main loop to display messages, wait for user input, start the timer, measure humidity, update the display, and wait for the timer to expire. Key functions include reading the keypad, displaying to the LCD, measuring the sensor, and running the timer. The conclusion discusses potential improvements like adding self-power, wireless capabilities, and a PC interface.

1. Water Control SystemWater Control System
ECET 491 SENIOR DESIGNECET 491 SENIOR DESIGN
Arthur ChenArthur Chen

2. AbstractAbstract
 Product SpecificationProduct Specification
 Hardware DesignHardware Design
 Software DesignSoftware Design
 ConclusionConclusion

3. Product FunctionProduct Function
1.1. Power OnPower On
2.2. Prompt Timer OptionPrompt Timer Option
3.3. Select Timer optionSelect Timer option
4.4. Start TimerStart Timer
5.5. Update HumidityUpdate Humidity
6.6. Timer StopTimer Stop

4. Hardware DesignHardware Design

5. Hardware DesignHardware Design
 LCD Display:LCD Display: 1. 20 characters X 21. 20 characters X 2
2. 8 bites interface2. 8 bites interface
 Key Pad:Key Pad: 1. 4X4 key number pad1. 4X4 key number pad
 Humidity Sensor:Humidity Sensor: 1. Built-in A/D converter1. Built-in A/D converter
2. Bidirectional Serial Interface2. Bidirectional Serial Interface
 Microcontroller: 1. 3 push buttons, 2 led displayMicrocontroller: 1. 3 push buttons, 2 led display
2. Timer Input Capture/Output Compare2. Timer Input Capture/Output Compare
3. SCI/SPI communication3. SCI/SPI communication
4. 8MHz Internal Bus operation4. 8MHz Internal Bus operation

6. Software DesignSoftware Design
 High Level:High Level:
Main( ): 1. Display User MessageMain( ): 1. Display User Message
2. Wait for User Input2. Wait for User Input
3. Push Button to Start3. Push Button to Start
4. Start Timer4. Start Timer
5. Measure Humidity5. Measure Humidity
6. Update Humidity6. Update Humidity
7. Wait for timer expire7. Wait for timer expire
 Low Level:Low Level:
KeyPad( ) : User InputKeyPad( ) : User Input
LCD( ) : User MessageLCD( ) : User Message
Sensor( ) : Humidity MeasurementSensor( ) : Humidity Measurement
Timer( ) : Timer CountTimer( ) : Timer Count

7. Main( )Main( )

8. Sensor( )Sensor( )

9. Sensor( )Sensor( )

10. LCD ( )LCD ( ) Key_Pad()Key_Pad() Timer()Timer()

11. ConclusionConclusion
 ImprovementImprovement
Self PowerSelf Power
Wireless ImplementationWireless Implementation
PC interfacePC interface