dht_npn

#include <DHT.h> // DHT sensor library
#include <avr/sleep.h> // sleep library
#include <stdlib.h> // library for maths
//https://github.com/dicksondickson/PlantFriends/blob/master/sensor_node/sensor_node.ino
// DHT Humidity + Temperature sensor define
#define DHTPIN 5 // Data pin (D5) for DHT
#define DHTPWR 4 // turn DHT on and off via transistor
#define DHTTYPE DHT11 // sensor model DHT11
DHT dht(DHTPIN, DHTTYPE); // define DHT11

// LED Pin
#define led 6

// Power Management Sleep cycles
int sleepCycledefault = 450; // Sleep cycle 450*8 seconds = 1 hour. DEFAULT 450
int soilMoistThresh = 250; // soil moisture threshold. reference chart


void setup()
{
  
  //Serial.begin(9600);
 
  //LED setup. 
  pinMode(led, OUTPUT);
  
  // Humidity sensor setup
  pinMode(DHTPWR, OUTPUT);
  dht.begin();

  // power on indicator
  LEDBlink(80);
  LEDBlink(80);
   
  
}


void loop()
{

// Humidity + Temperature sensor reading
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  digitalWrite(DHTPWR, HIGH); // turn on sensor
  delay (38); // wait for sensor to stabalize
  int dhttempc = dht.readTemperature(); // read temperature as celsius
  int dhthumid = dht.readHumidity(); // read humidity
  //Serial.println(dhttempc);
  
  // check if returns are valid, if they are NaN (not a number) then something went wrong!
  if (isnan(dhttempc) || isnan(dhthumid) || dhttempc == 0 || dhthumid == 0 ) {
    dhttempc = 0;
    dhthumid = 0;
    ErrorLvl += "23";
  }
  delay (18);
  digitalWrite(DHTPWR, LOW); // turn off sensor
  
}