I have to sleep the system in the night and have to wake the system in day time. I am using LDR to get input. LDR input is connected to interrupt pin 0 of Arduino Uno.

Here is my code.

#include <avr/sleep.h>
int led =13;
int triggerPin = 2;

void wakeUpNow() 
{

}

void setup()
{
pinMode(triggerPin, INPUT);
pinMode(led, OUTPUT);
attachInterrupt(0, sleepNow, LOW); 
}

void loop()
{
digitalWrite(led, HIGH);;
delay(1000);
digitalWrite(led, LOW);
}

void sleepNow() 
{
set_sleep_mode(SLEEP_MODE_PWR_DOWN); 
sleep_enable(); 
attachInterrupt(0,wakeUpNow, RISING); 
sleep_mode(); 
sleep_disable();
detachInterrupt(0); 
}

Cannot we attach two function in a interrupt?

Please let me know where I am doing wrong.

Thank you.

I have to sleep the system in the night and have to wake the system in day time. I am using LDR to get input. LDR input is connected to interrupt pin 0 of Arduino Uno.

Here is my code.

#include <avr/sleep.h>
int led =13;
int triggerPin = 2;

void wakeUpNow() 
{

}

void setup()
{
pinMode(triggerPin, INPUT);
pinMode(led, OUTPUT);
attachInterrupt(0, sleepNow, LOW); 
}

void loop()
{
digitalWrite(led, HIGH);;
delay(1000);
digitalWrite(led, LOW);
}

void sleepNow() 
{
set_sleep_mode(SLEEP_MODE_PWR_DOWN); 
sleep_enable(); 
attachInterrupt(0,wakeUpNow, RISING); 
sleep_mode(); 
sleep_disable();
detachInterrupt(0); 
}

Cannot we attach two function in a interrupt?

Edited The following code works perfectly. I want to replace the conditional check with interrupt.

#include <avr/sleep.h>
int led =13;
int wakePin = 2; 

void wakeUpNow() 
{
delay(100);
}

void setup()
{
pinMode(wakePin, INPUT);
pinMode(led, OUTPUT);
//attachInterrupt(0, sleepNow, LOW); 
}

void loop()
{
digitalWrite(led, HIGH);;
delay(1000);
digitalWrite(led, LOW);

if(digitalRead(wakePin)==LOW)
  sleepNow(); 

}

void sleepNow() 
{
set_sleep_mode(SLEEP_MODE_PWR_DOWN); 
sleep_enable(); 
attachInterrupt(0,wakeUpNow, RISING); function
sleep_mode(); 
sleep_disable(); 
detachInterrupt(0);
}

I want to replace `

if(digitalRead(wakePin)==LOW)
  sleepNow()

with`

attachInterrupt(0, sleepNow, LOW);

Please let me know how I can do that.

Thank you.