Arduino sleep mode, wakes up with interrupt

Projects General Guidance
1

Hello

How can I reduce the power consumption of Arduino by getting it into sleep mode, and it turns on or wakes up when the sensor reads something?

This code is being used to read continuously. But i want it to read whenever the sensor reads or senses data using interrupt.

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(3,4,5,6,7,8);

// Threshold values for the led bar
#define TH1 45
#define TH2 95
#define TH3 200
#define TH4 400
#define TH5 600

// Conversion factor - CPM to uSV/h
#define CONV_FACTOR 0.00812

// Variables
int ledArray [] = {10,11,12,13,9};
int geiger_input = 2;
long count = 0;
long countPerMinute = 0;
long timePrevious = 0;
long timePreviousMeassure = 0;
long time = 0;
long countPrevious = 0;
float radiationValue = 0.0;

void setup(){
pinMode(geiger_input, INPUT);
digitalWrite(geiger_input,HIGH);
for (int i=0;i<5;i++){
pinMode(ledArray*,OUTPUT);*

  • }*

  • Serial.begin(19200);*

  • lcd.clear(); *

  • attachInterrupt(0,countPulse,FALLING);*
    }
    void loop(){

  • if (millis()-timePreviousMeassure > 1){*
    _ countPerMinute = 60*count;_
    radiationValue = countPerMinute * CONV_FACTOR;

  • timePreviousMeassure = millis();*

  • if(count>=1){*

  • Serial.println(millis()); *

  • lcd.clear(); *

  • lcd.setCursor(0, 0);*

  • lcd.print("Counting ...");*

  • }*

  • if(countPerMinute <= TH1) ledVar(0);*

  • if((countPerMinute <= TH2)&&(countPerMinute>TH1)) ledVar(1);*

  • if((countPerMinute <= TH3)&&(countPerMinute>TH2)) ledVar(2);*

  • if((countPerMinute <= TH4)&&(countPerMinute>TH3)) ledVar(3);*

  • if((countPerMinute <= TH5)&&(countPerMinute>TH4)) ledVar(4);*

  • if(countPerMinute>TH5) ledVar(5);*

  • count = 0;*

  • }*
    }
    void countPulse(){

  • detachInterrupt(0);*

  • count++;*

  • while(digitalRead(2)==0){*

  • }*

  • attachInterrupt(0,countPulse,FALLING);*
    }
    void ledVar(int value){

  • if (value > 0){*

  • for(int i=0;i<=value;i++){*
    _ digitalWrite(ledArray*,HIGH);_
    _     }_
    _     for(int i=5;i>value;i--){_
    _ digitalWrite(ledArray,LOW);
     }
     }
     else {
     for(int i=5;i>=0;i--){
    digitalWrite(ledArray,LOW);
    }
    }
    }*_

2

Italic code is always faulty...

Have a look at How to use the forum :slight_smile:

3 
void countPulse(){
  detachInterrupt(0);
  count++;
  while(digitalRead(2)==0){
  }
  attachInterrupt(0,countPulse,FALLING);
}

Such a while loop inside an interrupt handler is a very, very bad idea and absolutely unnecessary as the interrupt triggers on a falling edge only. The detachInterrupt() and attachInterrupt calls are also not necessary as interrupts are blocked during interrupt handlers.

4

Not to mention changing a non-volatile variable from a ISR and using that variable without blocking interrupts (because a long isn't atomic for sure)....

5

How can I reduce the power consumption of Arduino by getting it into sleep mode, and it turns on or wakes up when the sensor reads something?

Study this excellent tutorial on power saving and sleep modes.