riffleitoDHT.ino

#include <JeeLib.h>
 
 ISR(WDT_vect) { Sleepy::watchdogEvent(); }
 
 
 #define outFileName "humid1.csv"
 
#define BATTERYPIN A3

 

 // temp and humidity
 #include "DHT.h"

#define DHTPIN A1     // what pin we're connected to

 #define DHTTYPE DHT22   // DHT 22  (AM2302)


#include <Wire.h>

DHT dht(DHTPIN, DHTTYPE);
 

int led = A2;
 
#include <SPI.h>
#include <SD.h>
 
#include <RTClib.h>
#include <RTC_DS3231.h>
 
RTC_DS3231 RTC;
 
 
// On the Ethernet Shield, CS is pin 4. Note that even if it's not
// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
// 53 on the Mega) must be left as an output or the SD library
// functions will not work.
const int chipSelect = 7;    
int SDpower = 5;
int sensorPower = 4;
 
 
File dataFile;
 
 
 
void setup(void) {
  
  pinMode(led, OUTPUT); 
  dht.begin();
  
  
  pinMode(SDpower,OUTPUT);
  pinMode(sensorPower,OUTPUT);
  digitalWrite(SDpower,LOW);
  digitalWrite(sensorPower,LOW);
  
   //initialize the SD card
  
  Serial.print("Initializing SD card...");
  // make sure that the default chip select pin is set to
  // output, even if you don't use it:
  pinMode(SS, OUTPUT);
  
  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    while (1) ;
  }
  Serial.println("card initialized.");
  
  //shut down the SD and the sensor -- HIGH is off
  //digitalWrite(SDpower,HIGH);
 // digitalWrite(sensorPower,HIGH);
  
  pinMode(led, OUTPUT); 
  
  // for i2c for RTC
  Wire.begin();
  RTC.begin();
  
  Serial.begin(9600);
  //analogReference(EXTERNAL);
 
  
  
  
  // check on the RTC
  if (! RTC.isrunning()) {
      Serial.println("RTC is NOT running!");
      // following line sets the RTC to the date & time this sketch was compiled
      RTC.adjust(DateTime(__DATE__, __TIME__));
    }
  
    DateTime now = RTC.now();
    DateTime compiled = DateTime(__DATE__, __TIME__);
    if (now.unixtime() < compiled.unixtime()) {
      //Serial.println("RTC is older than compile time!  Updating");
      RTC.adjust(DateTime(__DATE__, __TIME__));
    }
    
  
}
 
void loop(void) {
  
  
  
  
  
  
  digitalWrite(led, LOW);
  //delay(200);
  
  //Sleepy::loseSomeTime(10000); //-- will interfere with serial, so don't use when debugging 
  delay (2000); // use when debugging -- loseSomeTime does goofy things w/ serial
  
  //wake up the SD card and the sensor
  //digitalWrite(SDpower,LOW);
  //digitalWrite(sensorPower,LOW);
  
  //dht22
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit
  float f = dht.readTemperature(true);
  
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Compute heat index
  // Must send in temp in Fahrenheit!
  float hi = dht.computeHeatIndex(f, h);

  Serial.print("Humidity: "); 
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: "); 
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hi);
  Serial.println(" *F");
  
  
  
  
  DateTime now = RTC.now();
  
  //get the onboard temp from the RTC
  //RTC.forceTempConv(true);  //DS3231 does this every 64 seconds, we are simply testing the function here
    float RTCTemp = RTC.getTempAsFloat();
  
  
   long unixNow = now.unixtime();
   //bSerial.println(now.unixtime());
   
    
  digitalWrite(led, HIGH);
   delay(50);
   
  // delay(1000);
   
  uint8_t i;
  
 

 
 
// get the battery level
int batteryLevel = analogRead(BATTERYPIN);
 
    
 // write to sd card
 
 // Open up the file we're going to log to!
  dataFile = SD.open(outFileName, FILE_WRITE);
  if (! dataFile) {
    Serial.println("error opening datalog.txt");
    // Wait forever since we cant write data
    while (1) ;
  }
  
  
  int onboardTempInt = (int) (RTCTemp*100);
  
  
  // make a string for assembling the data to log:
  String dataString = "";
  
  dataString += String(unixNow);
  dataString +=",";
  
  dataString += onboardTempInt;
  
  //dataString += String(unixNow);
  dataString+=",";
  
    
  //Serial.print(h);
  dataString += String((int) (h*100));
  dataString+=",";
  
   //Serial.print(t);
  dataString += String((int) (t*100));
  dataString+=",";
    
  dataString += String(batteryLevel);
   //no final comma needed
 
  //write the string to the card
  dataFile.println(dataString);
 
 
  
  // print to the serial port too:
  Serial.println(dataString);
  
  // The following line will 'save' the file to the SD card after every
  // line of data - this will use more power and slow down how much data
  // you can read but it's safer! 
  // If you want to speed up the system, remove the call to flush() and it
  // will save the file only every 512 bytes - every time a sector on the 
  // SD card is filled with data.
  dataFile.flush();
 dataFile.close(); //<--- may be unnecessary
 
 
 //shut down the SD and the sensor
  //digitalWrite(SDpower,HIGH);
  //digitalWrite(sensorPower,HIGH);
  
  //delay(1000);
  
}