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delay_switch.ino
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//Includes
#include <avr/io.h>
#include <avr/interrupt.h>
#include <EEPROM.h>
#include <avr/wdt.h>
#define BUZZERPIN 0 // Connect to piezo buzzer
#define SWPIN 1 // Connect to the switch
#define HARTBEATPIN 3 // This pin used to monitor timer
#define FANPIN 4 // Connect to relay circuit
// State machine state
#define ST_INIT 0
#define ST_FAN_ON 1
#define ST_WAIT_OFF 2
#define ST_FAN_OFF 3
#define ST_DETENTION 4
#define ST_PRE_SETTING 5
#define ST_SETTING_1 6
#define ST_SETTING_2 7
#define ST_SETTING_OK_1 8
#define ST_SETTING_OK_2 9
// Switch state
#define ON 1
#define OFF 0
// Buzzer
#define BZ_ENTER_SETTING 0
#define BZ_SETTING_OK 1
#define BZ_SETTING_FAILED 2
#define BZ_SHORT_BEEP 3
// Timer counter value
// increase 1 per 0.5 second
#define SHORT_TIMEOUT 1
#define MID_TIMEOUT 3
#define LONG_TIMEOUT 8
#define DELAY_OFF_INCREMENT 360 // (3 * 60 * 2) increase 3 min / step
#define INST_OFF_SEC 20 // 10 sec
#define DEFAULT_DELAY_OFF_SEC 1440 // (12 * 60 *2) 12 min
byte SM_Current_St; // State machine current state
byte SM_Last_St; // State machine last state
unsigned int Delay_Off_sec; // Delay timer to turn off fan
unsigned int tmp_Delay_Off_sec; // temparory counter for setting stage
static volatile byte SM_Next_St; // State machine next state
static volatile unsigned int Timer_Counter; // Timer counter, the MAX value will be count to DELAY_OFF_SEC
static volatile byte SW_St; // Switch state ON/OFF
unsigned int Wdt_Counter; // Watchdog counter
void fan(byte onoff) {
digitalWrite(FANPIN, onoff);
}
void start_timer(void) {
TCNT1 = 12; // TCNT1 preset
// Set prescale to 2048(CS[13:10] = 0b1100) to start timer
// 1 interrupt / 500ms
TCCR1 |= (1<<CS13)|(1<<CS12);
TCCR1 &= ~((1<<CS10)|(1<<CS11));
}
void stop_timer(void) {
digitalWrite(HARTBEATPIN, LOW);
// Set CS[13:10] = 0 to stop timer1
TCCR1 &= ~((1<<CS13)|(1<<CS12)|(1<<CS11)|(1<<CS10));
Timer_Counter = 0;
}
void reset_timer(void) {
stop_timer();
start_timer();
}
void beep(byte state) {
stop_timer();
switch (state) {
case BZ_ENTER_SETTING:
digitalWrite(BUZZERPIN, HIGH);
delay(300);
digitalWrite(BUZZERPIN, LOW);
delay(100);
digitalWrite(BUZZERPIN, HIGH);
delay(100);
digitalWrite(BUZZERPIN, LOW);
break;
case BZ_SETTING_OK:
digitalWrite(BUZZERPIN, HIGH);
delay(100);
digitalWrite(BUZZERPIN, LOW);
delay(100);
digitalWrite(BUZZERPIN, HIGH);
delay(300);
digitalWrite(BUZZERPIN, LOW);
break;
case BZ_SETTING_FAILED:
digitalWrite(BUZZERPIN, HIGH);
delay(500);
digitalWrite(BUZZERPIN, LOW);
break;
case BZ_SHORT_BEEP:
digitalWrite(BUZZERPIN, HIGH);
delay(100);
digitalWrite(BUZZERPIN, LOW);
break;
}
start_timer();
}
void write_eeprom(unsigned int val) {
EEPROM.write(0, val >> 8);
EEPROM.write(1, val & 0x00FF);
}
unsigned int read_eeprom(void) {
unsigned int value;
value = (EEPROM.read(0) << 8 | EEPROM.read(1));
return value;
}
void setup() {
unsigned int Delay_Off_sec_init;
/* Initial variable */
pinMode(SWPIN, INPUT);
SW_St = digitalRead(SWPIN); // Read the current switch state
SM_Current_St = (SW_St == HIGH)? ST_FAN_ON:ST_INIT;
pinMode(HARTBEATPIN, OUTPUT);
digitalWrite(HARTBEATPIN, LOW);
pinMode(FANPIN, OUTPUT);
digitalWrite(FANPIN, LOW); // Turn off the fan
pinMode(BUZZERPIN, OUTPUT);
digitalWrite(BUZZERPIN, LOW);
Delay_Off_sec_init = read_eeprom();
Delay_Off_sec = (Delay_Off_sec_init == 0xFFFF)? DEFAULT_DELAY_OFF_SEC:Delay_Off_sec_init;
Wdt_Counter = 0;
cli();//disable interrupts during setup
// Setup switch interrupt
PCMSK |= (1 << PCINT1); // Enable PB1 change interrupt
GIMSK |= (1 << PCIE); // enable PCINT interrupt in the general interrupt mask
DDRB &= ~(1 << DDB1); // Set PB1 as input pin
// Setup Timer1
// start_timer();
TIMSK |= (1<<TOIE1); // Timer Overflow Interrupt Enable
// Setting Watchdog timer
WDTCR |= (1 << WDCE) | (1 << WDE);
// Watchdog timeout = 4s
WDTCR = (0 << WDCE) | (1 << WDE) | (1 << WDP3) | (0 << WDP2) | (0 << WDP1) | (0 << WDP0);
sei(); //last line of setup - enable interrupts after setup
}
void loop() {
if(SM_Current_St != SM_Next_St) {
SM_Last_St = SM_Current_St;
SM_Current_St = SM_Next_St;
switch(SM_Current_St) {
case ST_INIT:
stop_timer();
break;
case ST_DETENTION:
start_timer();
break;
case ST_FAN_ON:
reset_timer();
fan(ON);
break;
case ST_PRE_SETTING:
reset_timer();
break;
case ST_SETTING_1:
if (SM_Last_St == ST_SETTING_2) {
tmp_Delay_Off_sec += DELAY_OFF_INCREMENT;
beep(BZ_SHORT_BEEP);
} else
beep(BZ_ENTER_SETTING);
// reset_timer();
break;
case ST_SETTING_2:
reset_timer();
break;
case ST_SETTING_OK_2:
if (tmp_Delay_Off_sec != 0) {
Delay_Off_sec = tmp_Delay_Off_sec;
write_eeprom(Delay_Off_sec);
tmp_Delay_Off_sec = 0;
beep(BZ_SETTING_OK);
} else
beep(BZ_SETTING_FAILED);
// reset_timer();
SM_Next_St = ST_INIT;
break;
case ST_WAIT_OFF:
reset_timer();
break;
case ST_SETTING_OK_1:
if (tmp_Delay_Off_sec != 0) {
Delay_Off_sec = tmp_Delay_Off_sec;
write_eeprom(Delay_Off_sec);
tmp_Delay_Off_sec = 0;
beep(BZ_SETTING_OK);
} else
beep(BZ_SETTING_FAILED);
// reset_timer();
SM_Next_St = ST_FAN_ON;
break;
case ST_FAN_OFF:
fan(OFF);
SM_Next_St = ST_INIT;
break;
}
}
Wdt_Counter++;
if (Wdt_Counter > 0xfffe) {
wdt_reset();
Wdt_Counter = 0;
}
}
// Switch ISR
ISR(PCINT0_vect)
{
SW_St = (PINB >> PINB1) & 1; // PINB is the register to read the state of the pins
if (SW_St == ON) { // Switch: OFF -> ON
switch (SM_Current_St) {
case ST_INIT:
SM_Next_St = ST_DETENTION;
break;
case ST_PRE_SETTING:
if (Timer_Counter < SHORT_TIMEOUT)
SM_Next_St = ST_SETTING_1;
break;
case ST_SETTING_2:
if (Timer_Counter < LONG_TIMEOUT)
SM_Next_St = ST_SETTING_1;
break;
case ST_WAIT_OFF:
SM_Next_St = ST_FAN_ON;
break;
}
} else { // Switch: ON -> OFF
switch (SM_Current_St) {
case ST_DETENTION:
if (Timer_Counter < SHORT_TIMEOUT)
SM_Next_St = ST_PRE_SETTING;
break;
case ST_SETTING_1:
if (Timer_Counter < LONG_TIMEOUT)
SM_Next_St = ST_SETTING_2;
break;
case ST_FAN_ON:
if (Timer_Counter < INST_OFF_SEC)
SM_Next_St = ST_FAN_OFF;
else
SM_Next_St = ST_WAIT_OFF;
break;
}
}
}
// Timer ISR
ISR(TIMER1_OVF_vect)
{
TCNT1 = 12; // TCNT1 preset
switch (SM_Current_St) {
case ST_DETENTION:
if (Timer_Counter >= SHORT_TIMEOUT)
SM_Next_St = ST_FAN_ON;
break;
case ST_PRE_SETTING:
if (Timer_Counter >= SHORT_TIMEOUT)
SM_Next_St = ST_INIT;
break;
case ST_SETTING_1:
if (Timer_Counter >= LONG_TIMEOUT)
SM_Next_St = ST_SETTING_OK_1;
break;
case ST_SETTING_2:
if (Timer_Counter >= LONG_TIMEOUT)
SM_Next_St = ST_SETTING_OK_2;
break;
case ST_WAIT_OFF:
if (Timer_Counter >= Delay_Off_sec)
SM_Next_St = ST_FAN_OFF;
break;
}
digitalWrite(HARTBEATPIN, !digitalRead(HARTBEATPIN)); // Toggle HARTBEATPIN
Timer_Counter += 1;
}