Introduction to Microcontrollers Lab Manual - Microchip

10.1 OBJECTIVE
10.2 THE LAB
Lab 10. Project
Simulate a real embedded system.
10.2.1 Objective
LABS
Use the I/O of the MX PIC24F EDU Module and the MX Educational Target to simulate
a real-life system. Write a specification that defines which I/O is used to simulate the
environment and then write the code to control the system accordingly.
Use at least 5 of the lab topics in the system.
10.2.2 Elevator Control Example
10.2.2.1 SYSTEM OVERVIEW
The system to be developed is a 4-floor elevator controller. These will be called Level
1-Level 4. Each level will have a request button that users would press to request service
from the elevator. Each level will also have an indicator to display that service has
been requested. Once the request is serviced, the indicator will be turned off.
Inside the elevator, a character display will inform the occupants of the floor that the
elevator cart is approaching.
10.2.2.2 I/O MAPPING
The 4 push buttons on the MX Educational Target will represent the request buttons for
each level of the building. The 4 LEDs on the MX Educational Target will represent the
current location of the elevator.
The UART will be used to output the text to a terminal emulator running on an external
PC. The terminal emulator should be set to 9600 baud 8-N-1 to display the text properly.
The UART will also be used to input the destination floor for the user.
The timer interrupt will be used to simulate the time it takes for the elevator cart to go
from one floor to the next. This time will be set to 3 seconds from one floor to the next
floor.
10.2.2.3 TOPICS COVERED
1. I/O port control from Lab 0
2. UART control from Lab 3
3. Timers from Lab 1
4. Interrupts from Lab 2
5. Power-saving features from Lab 9
2011 Microchip Technology Inc. DS51963A-page 69