ECE 551Semester Project Elevator Controller

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ECE 551-Semester Project Elevator Controller

• Depeng Yang, Saijun Zhang
• November 30, 2006
• Electrical Computer Engineering Department
• University of Tennessee
• Knoxville, TN 37996-2100

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Outline

• Project Background
• System Requirements
• Input/Output description
• System Diagram
• Master FSM (finite states machine) description
• Slave FSM description

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Project Background

• This microelectronic system designed for this
  project aims to control a four floors elevator
  with 2 cars.
• The system is made up of input/output devices
  coupled with digital logic circuit implemented in
  a single application-specific integrated circuit
  (ASIC).
• This project involved the design, simulation,
  realization and demonstration of an elevator
  controller with 2 cars.
• VHDL, a hardware description language, is used in
  this project.

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System Requirements

• This project is for controlling a four floors
  elevator. The elevator should
• 1) keep its direction unchanged when
  it goes
• 2) do not move until it gets the
  request.

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Input/Output Assignment
Basic Input/output of Spartan3 Demo Board
8 switches4 push buttons 4 7-seg LEDs8 LEDs
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Input/Output Assignment (cont.)

• 1 6 switches (sw0 to sw5) that are in upper
  stand for the request from each floor outside the
  cars. When it are in down, it means no reuest.
• sw0 in upper stands for request for
  going up from the first floor outside the
  cars
• sw1 in upper stands for request for
  going up from the second floor outside the cars
• sw2 in upper stands for request for
  going down from the second floor outside the
  cars
• sw5 in upper stands for request for
  going down from the 4th floor outside the cars.

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Input/Output Assignment (cont.)

• 2 4 push buttons stand for the floor the people
  inside the car want to go to.
• BTN0 means the people inside want to
  go to the first floor
• BTN1 means the people inside
  want to go to the second floor
• BTN2 means the people inside
  want to go to the third floor
• BTN3 means the people inside
  want to go to the first floor

3 4 7-seg LEDs show which floor the car is
in. 4 LEDs show the different car condition,
respectively. The number displayed by LED0 shows
car1 condition and the number displayed by LED1
shows car2 condition.
4 four LEDs when it is on show which door is
open.
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System Diagram
This diagram shows how the blocks are connected.
The switchs signal will be sent to FSM, and push
buttons signal will be sent to FSM. After
checking with FSM, the signal will go to drive
LED.Clock divide module will send different
frequencies for different module. These above
parts are handle by Saijun. FSM part is handle by
Depeng. System requirement and states set in FSM
are talked by us.
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System Diagram
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Main FSM Controller

• Master FSM deal with outside request
• Slave FSM deal with inside request
• Master FSM invokes slave FSM when elevator stops
  at one floor

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Master FSM

• Function of master FSM Keep direction

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Master FSM Keep direction
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Master FSM Keep direction
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Slave FSM

• S1 car door is open. Passengers enter into the
  elevator
• S2 people in car press the button which
  represents the floor they want to reach
• S3 people press the button
• S4 people press the button
• S5 Car door is close. Car goes on.

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Master and slave FSM
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• Thank you !