node1

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <LowPower.h>
#include <elapsedMillis.h>
#include <SimpleTimer.h>
#define interval 100
#include "DHT.h"
#define DHTPIN 5    
#define DHTTYPE DHT22   // DHT 22 (AM2302)
void mydelay(int x);
void read_sensor();
void TX(int t, int h, int l, int g, int w);
void wakeUp();
DHT dht(DHTPIN, DHTTYPE);
RF24 radio(9,10);
elapsedMillis stopwatch;
SimpleTimer timer;
boolean flag = false;
const byte rxAddr_p0[] = "0xB3B0";
const int light_pin = A2, Gass_pin = A0,wakeUpPin = 3;
float temp=25, humidity;
int node_address=1;
char out_char[32];
char charbuff[10];
int dataready=0;
String stringbuff = "";
int lightlevel=0, high = 0, low = 1023;
int interrupt_handled=0;
int index=0,motion=0;
int sensorvalue;  // variable to store the value coming from the sensor

void read_sensor(){
  temp=dht.readTemperature();
  humidity=dht.readHumidity();
  lightlevel = analogRead(light_pin);
  sensorvalue = analogRead(Gass_pin);
  TX(temp, humidity,lightlevel, sensorvalue, motion);
}
void TX(int t, int h, int l, int g, int m){
  radio.stopListening();
  radio.openWritingPipe(rxAddr_p0);
  sprintf(out_char,"@%d,t1%d,h1%d,l1%d,g1%d,m1%d,\n",node_address,t,h,l,g,m);
  for(int i=0;i<32;i++){
    if(out_char[i]=='\n')
      index=i+1;
  }
  radio.write(out_char,index); 
  radio.startListening();
  radio.openReadingPipe(0, rxAddr_p0);
  stopwatch=0; //stopwatch reset
  flag=false;
  while(interval>stopwatch){
    if (radio.available()){
      char text[32] = {0};
      radio.read(&text, sizeof(text));
      int result=strcmp(text, "ack1");
      if(result==0){
        Serial.println(text);
        motion=0;
        flag=true;
        break;
      }    
    } 
  }
  if(flag){
    for(int i=0;i<32;i++)
    {
      out_char[i]=0;
    }
  }
  else{
    radio.stopListening();
    radio.openWritingPipe(rxAddr_p0);
    radio.write(out_char,sizeof(out_char));
  }
}
void mydelay(int x){
  for(unsigned int i=0; i<=x; i++)   
  {
    delay(100);
  }
}
void wakeUp(){
    interrupt_handled=1;
    motion=1;
    digitalWrite(4, 1);
    dht.begin();
    //Serial.println("motion detection");
    TX(temp, humidity, lightlevel, sensorvalue, motion);
}
void setup()
{             
    //To reduce power, setup all pins as inputs with no pullups
    for(int x = 1 ; x < 18 ; x++)
    {
      pinMode(x, INPUT);
      digitalWrite(x, LOW);
    }
    while (!Serial);
    Serial.begin(9600);
    radio.begin();
    
    radio.setRetries(10,5);
    radio.openWritingPipe(rxAddr_p0);
    radio.stopListening();
  
    // Configure wake up pin as input.
    // This will consumes few uA of current.
    pinMode(wakeUpPin, INPUT);   
    pinMode(7,OUTPUT);   
    pinMode(5,OUTPUT); 
    pinMode(4,OUTPUT);
    digitalWrite(4,1);
    delay(200);
    dht.begin();
    radio.write("node 1 test",sizeof("node 1 test"));
}
void loop()
{ 
    attachInterrupt(digitalPinToInterrupt(wakeUpPin), wakeUp, RISING);
    if(flag){
      digitalWrite(4, 0);
      delay(1000);
      LowPower.powerDown(SLEEP_4S, ADC_OFF, BOD_OFF);
      attachInterrupt(digitalPinToInterrupt(wakeUpPin), wakeUp, RISING);
      LowPower.powerDown(SLEEP_4S, ADC_OFF, BOD_OFF);
    }
    if(interrupt_handled==0){
      digitalWrite(4, 1);
      delay(500);
      dht.begin();
      read_sensor();
    }
    interrupt_handled=0;
}