Assignments 5

To undertake these assignments, install Microchip MPLAB (www.microchip.com), Labcenter ISIS Lite (www.proteuslite.com), and CCS C Lite (www.ccsinfo.com). Application files may be downloaded from www.picmicros.org.uk. Run the applications in MPLAB with Proteus VSM selected as the debug tool. Display the animated schematic in VSM viewer, with the application COF file attached to the MCU (see the appendices for details).

Assignment 5.1

Download the project TEMCON and check that it runs correctly in MPLAB with Proteus VSM viewer. Modify the program to display warning messages when the temperature is more that 3°C above the upper switching level (TOO HOT) or more that 3°C below the lower switching level (TOO COLD).

Assignment 5.2

Design a controller for a small hot and cold drinks machine, aimed at the domestic market. Write a specification based on your own understanding of the typical requirements of such a machine, draw a block diagram showing the interfacing required, and outline a control program which can be implemented in C. Predict the input, output, and memory requirements and select a PIC microcontroller (www.microchip.com) which provides the features required for this application at minimum cost.