ATtiny IR Remote

ATtiny2313 Infrared Sender

parts:

• ATtiny2313 @4MHz (internal oscillator)
• IR LED (series with 220-ohm resistor)
• Tact switches
• 3.7V lithium ion battery & Capacitor

avr-gcc (main.c) code:

	/*
	* http://projectproto.blogspot.com/2017/05/attiny-ir-remote.html
	*/
	#include <avr/io.h>
	#include <avr/interrupt.h>
	#include <avr/sleep.h>
	#include <util/delay.h>
	// led (OC0B) pin
	#define IRLED_ENABLE() DDRD |= _BV(DDD5); PORTD &= ~_BV(PD5);
	#define IRLED_DISABLE() DDRD &= ~_BV(DDD5);
	// push buttons
	#define POWER_BTN _BV(PB3)
	#define FUNCTION_BTN _BV(PB2)
	#define VOLUP_BTN _BV(PB4)
	#define VOLDOWN_BTN _BV(PB5)
	#define TUNEUP_BTN _BV(PB7)
	#define TUNEDOWN_BTN _BV(PB6)
	#define ALL_BTN (POWER_BTN|FUNCTION_BTN|VOLUP_BTN|VOLDOWN_BTN|TUNEUP_BTN|TUNEDOWN_BTN)
	#define TIMER_ENABLE_PWM() (TCCR0A |= _BV(COM0B1))
	#define TIMER_DISABLE_PWM() (TCCR0A &= ~(_BV(COM0B1)))
	#define TIMER_CONFIG_KHZ(val) ({ \
	const uint8_t pwmval = F_CPU / 2000 / (val); \
	TCCR0A = _BV(WGM00); \
	TCCR0B = _BV(WGM02) | _BV(CS00); \
	OCR0A = pwmval; \
	OCR0B = pwmval / 3; \
	})
	#define MARK(us) TIMER_ENABLE_PWM(); _delay_us(us)
	#define SPACE(us) TIMER_DISABLE_PWM(); _delay_us(us)
	#define SONY_HDR_MARK 2400
	#define SONY_HDR_SPACE 600
	#define SONY_ONE_MARK 1200
	#define SONY_ZERO_MARK 600
	//http://elektrolab.wz.cz/katalog/samsung_protocol.pdf
	#define SAMSUNG_HDR_MARK 4500
	#define SAMSUNG_HDR_SPACE 4500
	#define SAMSUNG_BIT_MARK 560
	#define SAMSUNG_ONE_SPACE 1690
	#define SAMSUNG_ZERO_SPACE 560
	void enableIROut (int khz)
	{
	IRLED_ENABLE();
	TIMER_CONFIG_KHZ(khz);
	}
	uint32_t reverseBits(uint32_t input, uint8_t nbits) {
	uint32_t output = input;
	for (uint8_t i = 1; i < nbits; i++) {
	output <<= 1;
	input >>= 1;
	output |= (input & 1);
	}
	return output;
	}
	uint32_t encodeSony (uint8_t nbits, uint8_t command,
	uint8_t address, uint8_t extended)
	{
	uint32_t result = 0;
	switch (nbits) {
	case 12: // 5 address bits.
	result = address & 0x1F;
	break;
	case 15: // 8 address bits.
	result = address & 0xFF;
	break;
	case 20: // 5 address bits, 8 extended bits.
	result = address & 0x1F;
	result |= (extended & 0xFF) << 5;
	break;
	default:
	return 0;
	}
	result = (result << 7) | (command & 0x7F);
	return reverseBits(result, nbits);
	}
	void sendSony (uint32_t data, int nbits)
	{
	// Set IR carrier frequency
	enableIROut(40);
	// Header
	MARK(SONY_HDR_MARK);
	SPACE(SONY_HDR_SPACE);
	// Data
	for (uint32_t mask = 1UL << (nbits - 1); mask; mask >>= 1) {
	if (data & mask) {
	MARK(SONY_ONE_MARK);
	SPACE(SONY_HDR_SPACE);
	} else {
	MARK(SONY_ZERO_MARK);
	SPACE(SONY_HDR_SPACE);
	}
	}
	}
	void sendSamsung (uint32_t data, int nbits)
	{
	// Set IR carrier frequency
	enableIROut(38);
	// Header
	MARK(SAMSUNG_HDR_MARK);
	SPACE(SAMSUNG_HDR_SPACE);
	// Data
	for (uint32_t mask = 1UL << (nbits - 1); mask; mask >>= 1) {
	if (data & mask) {
	MARK(SAMSUNG_BIT_MARK);
	SPACE(SAMSUNG_ONE_SPACE);
	} else {
	MARK(SAMSUNG_BIT_MARK);
	SPACE(SAMSUNG_ZERO_SPACE);
	}
	}
	// Footer
	MARK(SAMSUNG_BIT_MARK);
	SPACE(0); // Always end with the LED off
	}
	void enterSleep(void)
	{
	IRLED_DISABLE();
	// Enable Pin Change Interrupts on all buttons
	GIMSK |= _BV(PCIE);
	PCMSK |= ALL_BTN;
	sleep_enable();
	sei(); // Enable interrupts
	sleep_cpu();
	}
	ISR(PCINT_vect) {
	cli(); // Disable interrupts
	PCMSK &= ~ALL_BTN; // clear interrupt flags
	sleep_disable();
	_delay_ms(1);
	switch ( (~PINB) & ALL_BTN )
	{
	#if 1 // sony dvd
	case POWER_BTN:
	sendSony(encodeSony(15, 21, 80, 0), 15); // on/off
	break;
	case FUNCTION_BTN:
	sendSony(encodeSony(15, 105, 208, 0), 15); // source
	break;
	case VOLUP_BTN:
	sendSony(encodeSony(15, 18, 80, 0), 15); // volume +
	break;
	case VOLDOWN_BTN:
	sendSony(encodeSony(15, 19, 80, 0), 15); // volume -
	break;
	case TUNEUP_BTN:
	sendSony(encodeSony(20, 52, 16, 16), 20); // tune +
	break;
	case TUNEDOWN_BTN:
	sendSony(encodeSony(20, 51, 16, 16), 20); // tune -
	break;
	#else // samsung tv
	// https://github.com/lepiaf/IR-Remote-Code
	case POWER_BTN:
	sendSamsung(0xE0E040BF, 32); // on/off
	break;
	case FUNCTION_BTN:
	sendSamsung(0xE0E0807F, 32); // source
	break;
	case VOLUP_BTN:
	sendSamsung(0xE0E0E01F, 32); // volume +
	break;
	case VOLDOWN_BTN:
	sendSamsung(0xE0E0D02F, 32); // volume -
	break;
	case TUNEUP_BTN:
	sendSamsung(0xE0E048B7, 32); // channel +
	break;
	case TUNEDOWN_BTN:
	sendSamsung(0xE0E008F7, 32); // channel -
	break;
	#endif
	}
	}
	int main(void)
	{
	// analog comparator off
	ACSR &= ~_BV(ACD);
	DIDR |= _BV(AIN1D) | _BV(AIN0D);
	// initially all input pins with pull-up's
	DDRA = DDRB = DDRD = 0;
	PORTA = PORTB = PORTD = 0xFF;
	IRLED_ENABLE();
	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
	while(1) {
	enterSleep();
	}
	}

view raw ATtiny2313-IR-sender.c hosted with ❤ by GitHub

References:
ESP8266 IR Remote
z3t0/Arduino-IRremote
ATtiny Low Power