Controller Circuit

This chapter is based on the practical consideration of controller circuit.

AVR ATMEGA 16 MICRO CONTROLLERS

Fig.8.1 Shows the Pin diagram of AVR atmega 16 micro controller

• Features of AVR atmega 16 micro controller
• High-performance, Low-power AVR 8-bit Microcontroller.
• Advanced RISC Architecture

- Most Single Most Single-clock Cycle Execution clock Cycle Execution

- 32 x 8 General Purpose Working Registers

- Fully Static Operation

- Up to 16 MIPS Throughput at 16 MHz

- On-chip 2-cycle Multiplier

• High Endurance Non-volatile Memory segments

- 16K Bytes of In-System Self-programmable Flash program memory

- 512 Bytes EEPROM

- 1K Byte Internal SRAM

- Write/Erase Cycles: 10,000 Flash/100,000 EEPROM

- Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip Boot Program true Read- While-Write Operation

- Programming Lock for Software Security

CIRCUIT DIAGRAM

PROGRAM

Programming is done in C language.

Following is program of generating pulse for multilevel inverter

#include <avr/io.h>

#ifndef F_CPU

#define F_CPU 3590000UL

#endif

#include <avr/interrupt.h>

#include <avr/pgmspace.h>

#include <util/delay.h>

#include <avr/eeprom.h>

#include "LCD.h"

void delayT2();

prog_uchar COMP_NAME1[]="VGEC CHANDKHEDA";

prog_uchar COMP_NAME2[]="PWE GROUP NO ";

prog_uchar DUTY_INV[]="Tms IN1%IN2%IN3%";

unsigned int dinv1,dinv2,dinv3,Tduty;

int main(void)

{

DDRB|=(1<<3); // B3 AS OC0 PWM O/P, B1 & B2 TOGGLE AT TCCR2 TIME 10ms

DDRD|=(1<<4)|(1<<5)|(1<<7); // D4,D5,D7 AS OC1A/OC1B/OC2 PWM O/P &

DDRD=0XFF;

TCCR0=0X73; // CLK/64, FOC=3.59 MH, PHASE INV PWM MODE

TCCR1B=0X03;

TCCR1A=0XF1;

TCCR2=0X7E;

OCR0=26; // .5 MS

OCR1B=77; //1.5 ms

OCR1A=153; //3ms

OCR2=128; //9ms

Tduty=0X14; // TOTAL DUTY CYCLE TIME 20ms=510 pulses of one timer cycle

dinv1=0X59; // dinv1=(510-(2*OCR0)/510)*100 %

dinv2=0X46; // dinv2=(510-(2*OCR1A)/510)*100 %

dinv3=0X28; // dinv3=(510-(2*OCR1B)/510)*100 %

InitLCD(ALL_BLINK);

_delay_ms(100);

LCDGotoXY(0,0);

LCDWriteString(COMP_NAME1,0,0);

LCDGotoXY(0,1);

LCDWriteString(COMP_NAME2,0,1);

_delay_ms(10000);

LCDClear();

_delay_ms(100);

LCDGotoXY(0,0);

LCDWriteString(DUTY_INV,0,0);

LCDGotoXY(0,1);

LCDWriteInt(Tduty,2,0,0);

LCDGotoXY(5,1);

LCDWriteInt(dinv1,2,0,0);

LCDGotoXY(9,1);

LCDWriteInt(dinv2,2,0,0);

LCDGotoXY(13,1);

LCDWriteInt(dinv3,2,0,0);

while(1);

return(0);

}