Tutorial ADC dan LED

Tutorial ADC dan LED

Konsep
Pembacan ADC oleh ATMega 16A yang nantinya akan di tampilkan dalam LED dalam bentuk Bar.Hal ini dapat digunakan untuk mengetahui intensitas cahaya, volume suara, besar tegangan, pengukuran dan lain sebagainya yang di sajikan dalam bentuk Barisan LED

Alat yang digunakan

Minimum Sistem ATMega 16/32
Downloader ATMEL USB ISP V2
Software PROG ISP
BreadBoard
LED
Potensiometer
Jumper Male Female
Resistor 1K
Voltmeter

Tutorial

1. SKEMA RANGKAIAN

2. Susun Alat seperti pada Skema Rangkaian

Program pada Code Vision AVR

/*********************************************************************
This program was produced by the
CodeWizardAVR V2.05.0 Professional
Automatic Program Generator
© Copyright 1998-2010 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date    : 5/20/2014
Author :
Company :
Comments:

Chip type               : ATmega16
Program type            : Application
AVR Core Clock frequency: 12.000000 MHz
Memory model            : Small
External RAM size       : 0
Data Stack size         : 256
*****************************************************/

#include <mega16.h>

#include <delay.h>

#define ADC_VREF_TYPE 0x20

// Read the 8 most significant bits
// of the AD conversion result
unsigned char read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCH;
}

// Declare your global variables he
unsigned char dataadc ;
void main(void)
{
// Declare your local variables here

// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;

// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x00;

// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;

// Port D initialization
// Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=0 State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTD=0x00;
DDRD=0xFF;

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=0xFF
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=0xFF
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;

// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;

// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;

// USART initialization
// USART disabled
UCSRB=0x00;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// ADC initialization
// ADC Clock frequency: 750.000 kHz
// ADC Voltage Reference: AREF pin
// ADC Auto Trigger Source: ADC Stopped
// Only the 8 most significant bits of
// the AD conversion result are used
ADMUX=ADC_VREF_TYPE & 0xff;
ADCSRA=0x84;

// SPI initialization
// SPI disabled
SPCR=0x00;

// TWI initialization
// TWI disabled
TWCR=0x00;

while (1)
      {
      // Place your code here
      dataadc = read_adc(0);
      if (dataadc<0x1F)   // Tegangan ADC dibawah 0.625 V maka tidak ada LED yang menyala
      {
      PORTD = 0x00;
      }
      else if (dataadc<0x3E) // Tegangan ADC dibawah 1.25 V maka 1 LED yang menyala
      {
      PORTD = 0x01;
      }
      else if (dataadc<0x5D) // Tegangan ADC dibawah 1.875 V maka 2 LED yang menyala
      {
      PORTD = 0x03;
      }
      else if (dataadc<0x7C) // Tegangan ADC dibawah 2.5 V maka 3 LED yang menyala
      {
      PORTD = 0x07;
      }
      else if (dataadc<0x9B) // Tegangan ADC dibawah 3.125 V maka 4 LED yang menyala
      {
      PORTD = 0x0F ;
      }
      else if (dataadc<0xBA) // Tegangan ADC dibawah 3.75 V maka 5 LED yang menyala
      {
      PORTD = 0x1F;
      }
      else if (dataadc<0xD9) // Tegangan ADC dibawah 4.325 V maka 5 LED yang menyala
      {
      PORTD = 0x3F;
      }
      else
      {
      PORTD = 0x7F;
      }
      }
}

//********************************************************************************

Compile Program