Interrupt, Perform a specific function, not the loop

[vickey]

Hi. I have a node which sleeps most of the time and It has interrupt function enabled. But I want to perform a specific function when Node awake from sleep through interrupt pin 2, not the loop and again it should go to sleep using gw.sleep command. Is it possible to perform that specific function on an interrupt?

https://www.arduino.cc/en/Reference/AttachInterrupt describes what I need but I want to implement sleep function of mysensors also.

May someone please help me?

[scalz]

hi.
it is not recommended, and not good practice to do stuff in your interrupt routine. you must keep it short. one idea and there are others : you could set a boolean to true in your interrupt routine for this. and use this flag like you want in your loop for example. do things if your boolean=true or not...

[martinhjelmare]

@vickey

The sleep function with single interrupt returns true if woken by the interrupt and false if woken by the timer. Sleeping with two interrupts returns the number of the interrupt pin that wakes it or negative if timer wakes. See the API.

I would check the return value of the sleep function and divide the loop into at least two functions. One is run if interrupt wakes it, the other is run after timer wake up.

edit

Note that it's the interrupt number and not the pin number of the interrupt, that is returned for the two pin interrupt sleep function, according to the API.
http://www.mysensors.org/download/sensor_api_15#the-full-api

[n3ro]

This sounds great!

Do you have a code example?

[martinhjelmare]

@n3ro

It's untested, but here you go. It's a modified version of the sketch by @Anticimex for a binary switch with two interrupts.

https://codebender.cc/sketch:171302

[Anticimex]

I tested it when I submitted it so I can vouch for the functionality. At least for the time of submission. But the library might have changed since then of course.

[vickey]

@martinhjelmare Thank you so much buddy for the help. I have not tested it yet. Can I use it with mysensors 1.4 version? Because I am using easyiot as controller and it uses 1.4 version.

[martinhjelmare]

@vickey

Yes, I don't see why it shouldn't work with version 1.4, but as I said, I haven't even tested this myself yet. Try it, and post back if you encounter problems. It'll be interesting to see what your final version will be.

Btw, @hek, I noticed that the API says that the sleep function with two interrupts returns a bool, but looking at github it should be int8_t, which also makes sense.

int8_t sleep(uint8_t interrupt1, uint8_t mode1, uint8_t interrupt2, uint8_t mode2, unsigned long ms=0);

[vickey]

I have tried it with single interrupt and It is working good so far on my mysensors 1.4 version. In case of interrupt

wake = gw.sleep(INTERRUPT,FALLING, SLEEP_TIME);

I use wake value (wake == 1) for function related to interrupt and use else condition for function related to timer wake up.

[vickey]

Here is my sketch if someone finds it useful. It uses LDR to set night mode in low light conditions and vice versa, door reed switch and PIR sensor to turn ac or dc lights with the help of two channel relay and EasyIOT as server. Interrupts perform the functions of turning lights on and off while timer wake up decides the night mode implementation. Moreover, sensor node sleeps most of its time to conserve the battery.

#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_LIGHT 0
#define CHILD_ID_DOOR 1
#define CHILD_ID_PIR 2
#define CHILD_ID_LED 3
#define CHILD_ID_SAVER 4

#define LDR_PIN A0
#define DOOR_PIN 2
#define PIR_PIN 3
#define LED_PIN 4 // Relay 1 is attached
#define SAVER_PIN 5 // Relay 2 is attached

#define INTERRUPT DOOR_PIN-2

unsigned long SLEEP_TIME = 1200000; // Sleep time 1200000 i.e. 20 minutes (in milliseconds)

MySensor gw;

boolean activity = false;
boolean LEDSwitch = false;
boolean SaverSwitch = false;
boolean nightSwitch = false;

MyMessage msgLDR(CHILD_ID_LIGHT, V_LIGHT_LEVEL);
MyMessage msgDoor(CHILD_ID_DOOR, V_TRIPPED);
MyMessage msgPir(CHILD_ID_PIR, V_TRIPPED);

void setup()  
{ 
  gw.begin(NULL, AUTO, false, 1);
  gw.sendSketchInfo("BedRoom", "1.2");
  
  pinMode(DOOR_PIN,INPUT);
  pinMode(PIR_PIN,INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(SAVER_PIN, OUTPUT);
  
  digitalWrite(DOOR_PIN, HIGH);
  digitalWrite(PIR_PIN, HIGH);
  digitalWrite(LED_PIN, HIGH);
  digitalWrite(SAVER_PIN, HIGH);
  
  gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);
  gw.present(CHILD_ID_DOOR, S_DOOR);
  gw.present(CHILD_ID_PIR, S_MOTION);
  
  int LightLevel;
  for(int i = millis(); i < (millis() + 5000); i++){
    LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
  }
  if(LightLevel < 20){
    gw.send(msgLDR.set(LightLevel));
    nightSwitch = true;
  }
  else {
    gw.send(msgLDR.set(LightLevel));
    nightSwitch = false;
  }
}

void loop()      
{
  if(nightSwitch){ //When night switch is on
    int wake;
    wake = gw.sleep(INTERRUPT,FALLING, SLEEP_TIME);
    if(wake == 1){
      if(!activity){
        gw.send(msgDoor.set("1"));
        gw.send(msgDoor.set("0"));
        activity = true;
        if((!LEDSwitch) && (!SaverSwitch)){
          pirswitch();
        }
        else{ //activity finished
        activityoff();
        }
      }
    }
    else{ //Timer wake up
      int LightLevel;
      if((!LEDSwitch) && (!SaverSwitch)){
        for(int i = millis(); i < (millis() + 5000); i++){
          LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
        }
      }
      else{
        for(int i = millis(); i < (millis() + 1000); i++){
          LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
        }
      }
        
      if((LightLevel < 10) && ((!LEDSwitch) && (SaverSwitch))){
        Serial.println("Light level is less than 50%, Turning LED on");
        digitalWrite(LED_PIN, LOW);
        LEDSwitch = true;
        SLEEP_TIME = 7200000; // Sleep time changed to 2 hours
      }
      else if((LightLevel > 20) && ((!LEDSwitch) && (!SaverSwitch))){
        gw.send(msgLDR.set(LightLevel));
        nightSwitch = false;
        SLEEP_TIME = 7200000; // Sleep time changed to 2 hours
        gw.sleep(SLEEP_TIME);
      }
      else if((LightLevel > 5) && (nightSwitch) && ((!LEDSwitch) && (!SaverSwitch))){
        gw.send(msgLDR.set(LightLevel));
        SLEEP_TIME = 600000; // Sleep time changed to 10 minutes
      }
    }
  }
  else { //When night switch is off
    int LightLevel;
    for(int i = millis(); i < (millis() + 5000); i++){
      LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
    }
    if(LightLevel < 20){
      gw.send(msgLDR.set(LightLevel));
      nightSwitch = true;
      SLEEP_TIME = 7200000; // Sleep time changed to 2 hours
      gw.sleep(INTERRUPT,FALLING, SLEEP_TIME);
    }
    else if((LightLevel < 30) && (!nightSwitch)){
      SLEEP_TIME = 600000; // Sleep time changed to 10 minutes
      gw.sleep(SLEEP_TIME);
    }
    else if((LightLevel < 50) && (!nightSwitch)){
      SLEEP_TIME = 1800000; // Sleep time changed to 30 minutes
      gw.sleep(SLEEP_TIME);
    }
  }
}

void pirswitch()
{
  for(int i = millis(); i < (millis() + 5000); i++){ //Check PIR for activity 10 times with delay of half second
    boolean tripped = digitalRead(PIR_PIN) == HIGH;
    Serial.println(i);
    if(tripped){
      gw.send(msgPir.set(tripped?"1":"0"));
      Serial.println("Motion detected");
      //activity on function
      activityon();
      Serial.println("Loop terminated");
      break;
    }
  }
  delay(3000);
  activity = false;
}
       
void activityon()
{
  //turn saver on
  digitalWrite(SAVER_PIN, LOW);
  SaverSwitch = true;
  Serial.println("Energy saver turned on");
  int LightLevel;
  for(int i = millis(); i < (millis() + 1000); i++){ //Check if energy saver is on
    LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
  }
  if(LightLevel < 10){
    Serial.println("Light level is less than 50%, Turning LED on");
    digitalWrite(LED_PIN, LOW);
    LEDSwitch = true;
  }
  else{
    SLEEP_TIME = 1000;
    Serial.println("Sleep time changed to second");
  }
}
  
void activityoff()
{
  delay(3000);
  //turn off saver or LED
  digitalWrite(SAVER_PIN, HIGH);
  digitalWrite(LED_PIN, HIGH);
  Serial.println("Activity finished");
  SaverSwitch = false;
  LEDSwitch = false;
  activity = false;
  SLEEP_TIME = 7200000;
  Serial.println("Sleep time changed to 2 hours");
}

[AWI]

@vickey Just curious, what is the purpose of this piece of code?

 for(int i = millis(); i < (millis() + 5000); i++){
     LightLevel = (100 - ((1023-analogRead(LDR_PIN))/10.23));
   }

[MikeF]

@martinhjelmare In your code example, the sleep function needs a non-zero last parameter, in order to wake on timer.

So line 104 should read:

wake_cause = sensor_node.sleep(PRIMARY_BUTTON_PIN-2, CHANGE, SECONDARY_BUTTON_PIN-2, CHANGE, SLEEP_TIME);

where SLEEP_TIME is in milliseconds, e.g.,

unsigned long SLEEP_TIME = 60000;  	//  60 sec sleep time between reads (seconds * 1000 milliseconds)

Just tested this on the binary switch sketch.

[martinhjelmare]

@MikeF

Thanks! Good to hear that the sketch works after that correction.

[vickey]

@AWI This code runs continuously for 5 seconds in order to get a stable reading of light using LDR, which is used to set night mode on and off.