/*
hello, LED!
 
attiny13 Pins:
 
1: RESET (Arduino 10)
2: NC (not connected)
3: R (470Ω) to LED to GND
4: GND (Arduino Gnd)
5: MOSI (Arduino 11)
6: MISO (Arduino 12)
7: SCK (Arduino 13)
8: VCC (Arduino 5V)
 
*/
 
#define F_CPU 9600000	// Define software reference clock for delay duration
 
#include <avr/io.h>
#include <util/delay.h>
 
#define LED PB4 // Define led output on PB4
 
int main()
{
	DDRB |= (1 << LED); // Set direction to output for LED
 
	for (;;) {	// forever
		PORTB ^= (1 << LED);  // toggle pin
		_delay_ms(1000);
	}
	return 0;
}

/* 
Heartbeat - Hello World
PWM LED at OC0A (PB0) - Pin 5
*/  
 
#define F_CPU 9600000UL     // Define software reference clock for delay duration 1 MHz
 
#include <avr/io.h> 
#include <util/delay.h> 
 
#define PWM0 PB0
 
int i; 
int delay;
 
void pwm_init() {   //PWM Init 
 
   TCCR0A |= (1 << COM0A1) | (1 << COM0A0);    // COM0A1 - COM0A0 (Set OC0A on Compare Match, clear OC0A at TOP) 
   TCCR0A |= (1 << WGM01) | (1 << WGM00);   // WGM01 - WGM00 (set fast PWM) 
   OCR0A   = 0;                                // initialize Output Compare Register A to 0 
 
   //TCCR0B |= (1 << CS00);                      // Start timer at Fcpu / 1
   TCCR0B |= (1 << CS01);                    // Start timer at Fcpu / 8
   //TCCR0B |= (1 << CS02) | (1 << CS00);      // Start timer at Fcpu / 1024
 
} 
 
int main(void) { 
 
//Initialization: 
 
   DDRB |= (1 << PWM0);    // OC0A on PB0
   pwm_init();
 
//Actual Program: 
   while (1) {            // loop forever 
 
    for (i=0; i<=255; i++) { 
 
     OCR0A = (i); 
     _delay_us (200);
    }
 
    for (i=254; i>=0; i--) { 
 
     OCR0A = (i); 
     _delay_us (200);
    }
 
  } 
}

/* 
Analog sensor input at ADC3 (PB3) - Pin 2
Analog sensor input at ADC1 (PB2) - Pin 7
PWM LED at OC0A (PB0) - Pin 5
PWM LED at OC0A (PB1) - Pin 6
Digital FAN at (PB4) - Pin 3
*/  
 
#define F_CPU 9600000UL     // Define software reference clock for delay duration 1 MHz
 
#include <avr/io.h> 
#include <util/delay.h> 
 
#define ADC3 PB3
#define ADC1 PB7
#define FAN PB4
#define PWM0 PB0
#define PWM1 PB1
 
unsigned int read_adc(unsigned char channel);
 
int i; 
unsigned int sensorValue; //16bit 
unsigned int temperatureValue; //16bit
unsigned int outputVoltage;
 
void adc_init() {   //ADC init
 
   ADMUX =  0b00000011; //ADC3 (default),right,VCc
   //ADMUX =  0b00100011; //ADC3 (default),ADLAR left,VCc
   ADCSRA = 0b10000010; //prescaled by 4
}
 
void pwm_init() {   //PWM Init 
 
   TCCR0A |= (1 << COM0A1) | (1 << COM0A0);    // COM0A1 - COM0A0 (Set OC0A on Compare Match, clear OC0A at TOP) 
   TCCR0A |= (1 << COM0B1) | (1 << COM0B0);    // COM0B1 - COM0B0 (Set OC0B on Compare Match, clear OC0B at TOP) 
 
   TCCR0A |= (1 << WGM01) | (1 << WGM00);   // WGM01 - WGM00 (set fast PWM) 
 
   OCR0A   = 0;                                // initialize Output Compare Register A to 0 
   OCR0B   = 0;                                // initialize Output Compare Register B to 0 
 
   //TCCR0B |= (1 << CS00);                      // Start timer at Fcpu / 1
   TCCR0B |= (1 << CS01);                    // Start timer at Fcpu / 8
   //TCCR0B |= (1 << CS02) | (1 << CS00);      // Start timer at Fcpu / 1024
 
} 
 
int main(void) { 
 
//Initialization: 
   DDRB &= ~(1 << ADC3);  // Set direction of (PB3) to input for ADC3
   DDRB |= (1 << FAN);    // Set direction of (PB4) to output for FAN
   DDRB |= (1 << PWM0) | (1 << PWM1);    // OC0A on PB0 & P01
 
   adc_init(); 
   pwm_init();
 
//Actual Program: 
   while (1) {            // loop forever 
 
     sensorValue = read_adc(3);  
 
     OCR0A = (255-(sensorValue>>2)); 
     OCR0B = ((sensorValue>>2));  
 
     temperatureValue = read_adc(1);
 
     // map it to the range 0 to 5000 mV:
     //outputVoltage = ((sensorValue*50) / 255);  
 
     // Calculate Temperature, 10mV/°C -50°C for TMP36, check data sheet
     //temperatureValue = (2 + (outputVoltage*10));
 
     if (temperatureValue >= sensorValue) {
       PORTB = (1 << FAN);
       } 
 
     else {
       PORTB = (0 << FAN);
       }
  } 
}
 
 
unsigned int read_adc(unsigned char channel) {
 
	unsigned char k;
	unsigned int adcvalue=0;
	ADMUX = ADMUX&(0b11111100); //clear channel select bits
	ADMUX |= channel; 	
 
	//neglect first reading after changing channel
	ADCSRA |= 1<<ADSC;
	while(ADCSRA&(1<<ADSC));//Wait
	adcvalue=ADCL + (ADCH<<8);
	adcvalue=0;//neglectreading
	for(k=0;k<=7;k++)
	{
		ADCSRA |= 1<<ADSC;
		while(ADCSRA&(1<<ADSC));//Wait
		adcvalue += (ADCL + (ADCH<<8));
                _delay_ms (2);
	}
	return (adcvalue>>3); //divide by 8
 
}

/* 
Analog sensor input at ADC3 (PB3) - Pin 2
PWM LED at OC0A (PB0) - Pin 5
Digital FAN at (PB4) - Pin 3
*/  
 
#define F_CPU 9600000UL     // Define software reference clock for delay duration 1 MHz
 
#include <avr/io.h> 
#include <util/delay.h> 
 
#define FAN PB4
#define PWM PB0
 
int i ; 
int TEMP; 
 
void adc_init() {    //ADC Init. 
 
   ADCSRA |= (1<<ADEN) | (1<<ADPS1) | (1<<ADPS2) | (1<<ADATE);   //Turn on ADC, with prescaler 64 
   ADCSRB= 0x00;   //Free running mode 
   ADMUX= 0x23;   //VCC Reference, Left Adjust, Channel: PB3 (ADC3) 
   DIDR0= 0x04;   //Disable Digital Input on PB3 
   ADCSRA |= (1 << ADSC); //start adc conversion
 
} 
 
void pwm_init() {   //PWM Init 
 
   DDRB |= (1 << PWM);                       // OC0A on PB0 
   TCCR0A |= ((1 << COM0A1) | (1 << COM0A0)  // COM0A1 - COM0A0 (Set OC0A on Compare Match, clear OC0A at TOP) 
       | (1 << WGM01)    | (1 << WGM00)); // WGM01 - WGM00 (set fast PWM) 
   OCR0A   = 0;                              // initialize Output Compare Register A to 0 
   TCCR0B |= (1 << CS01);                    // Start timer at Fcpu / 256 
 
} 
 
int main(void) { 
 
//Initialization: 
   adc_init(); 
   pwm_init();
   DDRB |= (1 << FAN);    // Set direction of (PB4) to output for FAN
 
//Actual Program: 
   while (1) {            // loop forever 
 
     OCR0A = (255-(ADCH)); 
     TEMP = (2 + (2*ADCH));
 
     if (TEMP >= 28) {
       PORTB = (1 << FAN);
       } 
 
     else {
       PORTB = (0 << FAN);
       }
  } 
}