Elevator Controller BRANDON AHO AND JINBO ZHU

Transcription

1 Elevator Controller BRANDON AHO AND JINBO ZHU

2 What are we modeling?

3 What are our simplifications? Small model with robotics components No special operation such as special buttons, weight compensation, vibrations in the system, safety measures, precise elevation etc. 2 floors No doors This is a demonstration of the controller s basic operation not a simulation of an actual elevator.

4 What are we using to model it? HCS12 Microcontroller on SSMI Board Breadboard Resistors x4 Indicator Switches x2 User Switches x2 DC Stepper Motor DC Stepper Motor Controller Actobotics Equipment

5 What are we using to model it? HCS12 Microcontroller Breadboard Resistors x4 User Switches x2 DC Stepper Motor Controller

6 What are we using to model it? DC Stepper Motor Indicator Switch x2 (microswitch) Actobotics equipment (C channel, sprockets, chain, various fasteners, shaft) 2 objects of equal mass to simulate elevator and counterweight

7 What are we using to model it? Normally open contact. Normally closed contact. Common pin is connected to HCS12 input pin. Grounded via resistor. A complete depression of the lever arm is suggested to ensure a signal is sent.

8 How does it all work together? The microcontroller controls the elevator just how you would expect it to. Press a button, no other user buttons will function again until the elevator reaches its destination. Controller knows if a floor has been reached through input from one of two indicator microswitches.

9 How does it all work together?

10 Rough Timing Diagram

11 pseudocode

12 How the hardware works Stepper motor has four wires & poles: A, A, B, B Stepper motor controller handles the clockwise/ counter clockwise rotation of the stepper motor Pulse the step pin to rotate the motor one position. This advances the DC stepper motor pins in the correct fashion it is hard-coded onto the motor controller Direction pin can be logic 1 or 0. Motor receives +9V from the AC to DC power source

13 What special functions of the HCS12 are we implementing? Real-Time Interrupt System Output Compare Sends a pulse from the HCS12 to the motor controller at varying intervals, giving us an acceleration profile similar to what one would expect from a real world elevator. Loops and logic structures to handle our four states: stationary at top, stationary at bottom, moving up, and moving down. As one might expect, the user buttons will not do anything until the previous button s corresponding floor has been reached. The microswitches only cause a state change when the elevator is already in motion.

14 Our conclusions The HCS12 in conjunction with DC stepper motor & controller work for this small application. Not enough pins for a full-scale building with potentially more than a hundred floors. No accounting for weight changes in the elevator, this factor is removed by using a stepper motor. Not as advanced as other elevator controllers which are built with other features which can control the lighting, doors, sounds, music, entertainment/news/weather/directory consoles, and even video communications/ surveillance of modern elevator systems.

15 Your questions