Microcontroller Applications ELEC 421 Dr. Ron Hayne Images Courtesy of Ramesh Gaonkar and Delmar Learning.

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Presentation transcript:

Microcontroller Applications ELEC 421 Dr. Ron Hayne Images Courtesy of Ramesh Gaonkar and Delmar Learning

Embedded System  Typical analog/digital system Transducer Converts non-electrical signals into electrical signals A/D converter Converts analog signals into digital signals Digital processor Processes digital data D/A converter Converts digital signals into equivalent analog signals Transducer Converts electrical signals into non-electrical signals ELEC 330

PIC18 A/D Converter ELEC 330

Pulse Width Modulation  Duty Cycle Percentage ratio of on time of a pulse to its period  Changing of the duty cycle is defined as PWM CCP pin is set as an output Count for period and duty cycle loaded into CCP registers Varying the duty cycle generates PWM  PWM for DC Motor Control Varies average DC voltage Controls DC motor speed ELEC 330

PWM Mode  CCP module with Timer2 Output a pulse wave form for a given frequency/duty cycle  Duty cycle CCPR1L register  Period PR2 register  When TMR2 is equal to PR2 TMR2 is cleared Pin RC2/CCP1 of PORTC is set high PWM duty-cycle byte loaded into CCPR1 ELEC 330

MPLAB X IDE  Compile/Assemble Source Files Linker Script for specific Microcontroller  Test Programs Simulator In Circuit Debugger PICKit 3  Program Microcontroller PICKit 3 ELEC 330

PICKit 3 ELEC 330

PIC18 Explorer Demo Board ELEC 330

PIC18F8722 ELEC 330

2WD Robot Chassis ELEC 330

Dual H-Bridge Motor Driver ELEC 330

Microcontroller Applications  Analog to Digital Conversion Interface Analog Sensors (Transducers)  Pulse Width Modulation DC Motor Control  MPLAB X IDE Programming and Debugging  PIC18 Explorer Demo Board PIC18F8722 with lots of I/O  Robot Chassis H-Bridge Motor Driver ELEC 330