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/*
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*
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* Program for a door watch with sleep mode and pin change interrupt wake up
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* 2024
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*
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*/
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#include <stdint.h> // Integer variable
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#include <avr/io.h> // I/O ports
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#include <util/delay.h> // Delay function
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#include <avr/sleep.h> // Sleep mode
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#include <avr/interrupt.h> // Interrupt implemention
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#include <avr/wdt.h> // Watchdog timer
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#ifndef F_CPU // Include guards
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#define F_CPU 8000000UL // AT90USB162 runs at 8 MHz clock speed - unsigned long
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#endif // Include guards
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/***************************************************
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* Name: ISR(PCINT0_vect)
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*
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* Returns: Nothing.
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*
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* Parameters: None.
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*
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* Description: Interrupt service routine
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*
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***************************************************/
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ISR(PCINT0_vect){ // Port B, PCINT0 - PCINT7
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}
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/***************************************************
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* Name: status
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*
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* Returns: Nothing.
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*
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* Parameters: None.
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*
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* Description: Status indication.
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*
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***************************************************/
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void status (){
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PORTB |= (1 << PB5);
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_delay_ms (1000);
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PORTB &= ~(1 << PB5);
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_delay_ms (1000);
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}
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/***************************************************
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* Name: open
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*
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* Returns: Nothing.
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*
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* Parameters: None.
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*
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* Description: Indication for door is open.
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*
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***************************************************/
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void open (){
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PORTB |= (1 << PB6);
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_delay_ms (1000);
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PORTB &= ~(1 << PB6);
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_delay_ms (1000);
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}
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/***************************************************
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* Name: alarm
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*
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* Returns: Nothing.
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*
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* Parameters: None.
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*
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* Description: Alarm.
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*
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***************************************************/
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void alarm (){
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PORTB |= (1 << PB5);
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PORTB |= (1 << PB6);
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_delay_ms (1000);
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PORTB &= ~(1 << PB5);
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PORTB &= ~(1 << PB6);
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_delay_ms (1000);
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}
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/***************************************************
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* Name: main(void)
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*
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* Returns: Nothing.
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*
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* Parameters: None.
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*
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* Description: Main program
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*
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***************************************************/
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int main(void){
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// I/O Pin setup
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DDRB &= ~(1 << PB4); // Pin PB4 as input - Button
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DDRB |= (1 << PB5); // Pin PB5 as output - green LED
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DDRB |= (1 << PB6); // Pin PB6 as output - Buzzer/ red LED
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// Variables
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uint8_t counter = 0; // Variable for counting the clock cycles how long the door was open
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// Main loop
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while (1){
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status(); // Status blink
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if (PINB & (1 << PB4) && (counter < 2)){ // If button PB4 pressed = door open (HIGH -> LOW)
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for (uint8_t i = 0; i <= 2; i++){ // Loop until it checks input again (2 times)
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open(); // Door open indication
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}
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counter += 1; // Counts up for how many times is input "door open" checked
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}
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if (PINB & (1 << PB4) && (counter == 2)){ // If button PB4 still pressed = door still open (HIGH -> LOW)
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for (uint8_t i = 0; i <= 2; i++){ // Loop until it checks input again (2 times)
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alarm(); // Door to long open -> alarm
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}
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}
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if ((!(PINB & (1 << PB4))) && (counter <= 2)){ // If button PB4 released = door closed and wasn't open before or closed for a while (LOW -> HIGH)
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counter = 0; // Reset counter
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// Pin change interrupt setup
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cli(); // Disable interrupt for programming
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PCICR |= (1<<PCIE0); // Turn on port b
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PCMSK0 |= (1 << PB4); // Turn on pin PB4, which is PCINT4
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sei(); // Enable interrupt
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// Sleep mode list
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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// set_sleep_mode(SLEEP_MODE_PWR_SAVE);
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// set_sleep_mode(SLEEP_MODE_STANDBY);
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// set_sleep_mode(SLEEP_MODE_EXT_STANDBY);
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// set_sleep_mode(SLEEP_MODE_IDLE);
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// set_sleep_mode(SLEEP_MODE_ADC);
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sleep_mode(); // Start sleep mode
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}
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}
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}
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