Introduction to Microcontrollers Lab Manual - Microchip

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LABS 5.3 THE LAB 5.3.1 Objective Set up the Comparator and Voltage Reference module to create a simple voltage meter. Use the breadboard area on the MX Educational Target board to provide a very simple adjustable voltage source. Setup Comparator 1 with Vin- = C1INB (pin 21) and with Vin+ = CVref. Adjust the voltage reference to measure the input voltage on C1INB. Format the results and send back the results as a three-digit number formatted similar to “1.65V”. To make things a little easier, simply step through the reference voltages with CVRR = 1 (0V to 2.06V), monitor when the comparator output changes and report that voltage back through the serial port. To make debugging easier, configure the Voltage Reference module to output the voltage level on the CVREF pin (CVRCON = CVREN). This will enable you to view the behavior of the VRef voltage with an external multi-meter. Note: Make sure to wait for the voltage reference to stabilize before checking the output of the comparator. Verify the measured results with a multi-meter. 5.3.2 Bonus Modify the code to use a divide and conquer method of determining the voltage with a minimum number of iterations. Also use all reasonable reference voltages available, ie. CVRR = 0 and CVRR = 1 for the full range from 0V to 2.37V with more steps. 5.3.3 Pertinent Information You will need to setup a simple external variable voltage circuit to vary an external voltage signal. This will be used as the external voltage to drive comparators Vin- input. Wire a potentiometer as illustrated below. Potentiometer Potentiometer Circuit The potentiometer (also known as a “pot”) is a three terminal resistor that will form an adjustable voltage divider. This will allow adjustment of the voltage at the comparators Vin- input between 0 and 3.3V. The basic program flow is depicted in Figure 5-5. DS51963A-page 40 2011 Microchip Technology Inc.
FIGURE 5-5: LAB 5 BASIC PROGRAM FLOW The template assembly file sets up this basic program flow. The student will need to add the appropriate code to the relevant sections of the file lab5-comparator.s. 2011 Microchip Technology Inc. DS51963A-page 41
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Page 5 and 6: INTRODUCTION INTRODUCTION TO MICROC
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Page 9 and 10: 0.3 THE LAB 0.2.5 I/O Ports The abi
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Page 15 and 16: Setup the Simulator processor frequ
Page 17 and 18: FIGURE 1-3: LAB 1 BASIC PROGRAM FLO
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Page 21 and 22: FIGURE 2-2: LAB 2 PRIMARY AND ALTER
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Page 25 and 26: 3.1 OBJECTIVE 3.2 PRE-LAB Lab 3. UA
Page 27 and 28: 3.2.4 I/O Ports with Peripheral Pin
Page 29 and 30: For example: Mapping Action Map “
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Page 45 and 46: To configure the A/D module, the fo
Page 47 and 48: 6.3 THE LAB The first code transiti
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Page 53 and 54: FIGURE 7-3: OUTPUT COMPARE BLOCK DI
Page 55 and 56: LEDs are on the following ports: LE
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Page 59 and 60: 8.2.7 Serial Peripheral Interface (
Page 61 and 62: 8.3 THE LAB 8.3.1 Objective Write a
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Page 65 and 66: FIGURE 9-1: PIC24FJ256GB110 FAMILY
Page 67 and 68: 9.3 THE LAB 9.2.7 Microchip XLP Tec
Page 69 and 70: 10.1 OBJECTIVE 10.2 THE LAB Lab 10.
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Page 73 and 74: A.3 STEP THREE: CREATE NEW PROJECT

Introduction to Microcontrollers Lab Manual - Microchip

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