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Код: Выделить всё

/*
 * GccApplication1.cpp
 *
 * Created: 11.10.2014 18:00:12
 *  Author: user
 */ 


#define F_CPU 10000000UL
#include <avr /io.h>
#include <util /delay.h>

// delay for up to 65k milliseconds
void delayms(uint16_t millis)
{
	// loop, delaying 1ms each iteration
	while ( millis )
	{
		_delay_ms(1);
		millis--;
	}
}

// initialise the adc
void init_adc ( void )
{
	//select internal (1.1) voltage as the reference voltage (x1xx xxxx)
	ADMUX = 0x40;
	//enable ADC (1000 0000)
	ADCSRA |= 0x80;
}

// read the specified adc
int adc_read ( uint8_t n )
{
	// set the adc to the chosen channel
	ADMUX = n;
	// start the ADC conversion, set the ADC clock to cpu clock / 16 (0100 0100)
	ADCSRA |= 0x44;
	// wait for the adc conversion to be completed
	while((ADCSRA & 0x40) !=0){};
	// return the adc result
	return ADC;
}

int main(void)
{
	// set PB3 to output
	DDRB |= 1< <PB3;
	// turn on the ADC
	init_adc();
	// set up our variables
	int reading = 0;
	// loop for ever
	while(1) {
		// take a new adc reading
		reading = adc_read(2);
		// if the voltage is less than 3
		if ( reading < 837 )
		{
			// turn the output pin off
			PORTB |= 1<<PB3; /* LED off */
		}
		else
			
		{
			// turn the output pin on
			PORTB &= ~(1< <PB3);
		}
		// wait for 20ms
		delayms(20);
	}
	return 0;
}

Код: Выделить всё

/*
 * GccApplication1.cpp
 *
 * Created: 11.10.2014 18:00:12
 *  Author: user
 */ 


#define F_CPU 10000000UL
#include <avr/io.h>
#include <util/delay.h>

// delay for up to 65k milliseconds
void delayms(uint16_t millis)
{
	// loop, delaying 1ms each iteration
	while ( millis )
	{
		_delay_ms(1);
		millis--;
	}
}

// initialise the adc
void init_adc ( void )
{
	//select internal (1.1) voltage as the reference voltage (x1xx xxxx)
	ADMUX = 0x40;
	//enable ADC (1000 0000)
	ADCSRA |= 0x80;
}

// read the specified adc
int adc_read ( uint8_t n )
{
	// set the adc to the chosen channel
	ADMUX = n;
	// start the ADC conversion, set the ADC clock to cpu clock / 16 (0100 0100)
	ADCSRA |= 0x44;
	// wait for the adc conversion to be completed
	while((ADCSRA & 0x40) !=0){};
	// return the adc result
	return ADC;
}

int main(void)
{
	// set PB3 to output
	DDRB |= 1<<PB3;
	// turn on the ADC
	init_adc();
	// set up our variables
	int reading = 0;
	int threshold = 921;
	// loop for ever
	
	while(1) {
		// take a new adc reading
		reading = adc_read(2);
		// if the voltage is less than 3
		if ( reading < threshold )
		{
			// turn the output pin off
			PORTB |= 1<<PB3; /* LED off */
			threshold = 1005; // не включим пока не будет 3,6В
		}
		else
		{
			// turn the output pin on
			PORTB &= ~(1<<PB3);
			threshold = 837; // не выключим пока не будет 3,0В
		}
		// wait for 20ms
		delayms(20);
	}
	return 0;
}