olmPlotlyDHT22ThermistorOLM1.ino

// Using Plot.ly's Arduino API to visualize Temperature and Humidity Readings from A DHT22 Sensor

#include <SPI.h>
#include <Ethernet.h>
#include "plotly_ethernet.h"
#include "DHT.h"

#include <thermistor.h>
// Calibration coeffs for RSBR-302J-Z50 Teflon-Coated 3k Thermistor
#define A 3.3501
#define B 0.5899
#define C 0.0104
#define R_25C 3000.0 /*ohms*/
#define R_STANDARD 3003.0 /*ohms*/

Thermistor firstThermistor(A,B,C,R_25C,R_STANDARD);

// DHT Sensor Setup
#define DHTPIN 2 // We have connected the DHT to Digital Pin 2
#define DHTTYPE DHT22 // This is the type of DHT Sensor (Change it to DHT11 if you're using that model)
DHT dht(DHTPIN, DHTTYPE); // Initialize DHT object
plotly plotly; // initialize a plotly object, named plotly

//initialize plotly global variables
char layout[]="{}";
//char layout[] = "{\"xaxis\": {\"title\": \"Time\"}, \"yaxis\": {\"title\": \"Temp C\"}, \"yaxis2\": {\"title\": \"RH\"}}";
char filename[] = "feed7-olm1"; // name of the plot that will be saved in your plotly account -- resaving to the same filename will simply extend the existing traces with new data

// Ethernet Setup
byte mac[] = { 0x90, 0xA2, 0xDA, 0x0D, 0x52, 0xC5 };
byte my_ip[] = { 172, 30, 50, 252 }; // google will tell you: "public ip address"

void startEthernet(){
  
  
  if (plotly.VERBOSE) {
    Serial.println("Initializing ethernet");
  }
    if(Ethernet.begin(mac) == 0){
        if (plotly.VERBOSE) {
        Serial.println("Failed to configure Ethernet using DHCP");
        }
        // no point in carrying on, so do nothing forevermore:
        // try to congifure using IP address instead of DHCP:
        Ethernet.begin(mac, my_ip);
    }
      if (plotly.VERBOSE) {
    Serial.println("Done initializing ethernet");
      }
    delay(1000);
}

void setup() {
  // Open serial communications and wait for port to open:
    
  dht.begin(); // initialize dht sensor reading
  startEthernet();    // initialize ethernet
  
  // Initialize plotly settings
  plotly.VERBOSE = false; // turn to false to suppress printing over serial
  plotly.DRY_RUN = false; // turn to false when you want to connect to plotly's servers 
  plotly.username = "donblair"; // your plotly username -- sign up at https://plot.ly/ssu or feel free to use this public account. password of the account is "password"
  plotly.api_key = "6f3ad11nnb"; // "public_arduino"'s api_key -- char api_key[10]
  plotly.timestamp = true; // tell plotly that you're stamping your data with a millisecond counter and that you want plotly to convert it into a date-formatted graph
  plotly.timezone = "America/Montreal"; // full list of timezones is here:
  
  
  firstThermistor.begin(0);
  
  if (plotly.VERBOSE) {
  Serial.begin(9600);
    while (!Serial) {
      ; // wait for serial port to connect. Needed for Leonardo only
    }
  }
  
}

void loop() {
  
      float h = dht.readHumidity(); // read humitidy from DHT pin
      float t = dht.readTemperature(); // read temperature from DHT pin (ours calibrated accuractly to our home thermostat with -5 to the temperature)

   
     // Thermistor stuff 
      double V = firstThermistor.readVoltage();
    double R = firstThermistor.readResistance();
    float T = firstThermistor.readTemperature();
    
    if (plotly.VERBOSE) {
    Serial.println("---");
    Serial.print("voltage: ");
    Serial.println(V);
    Serial.print("resistance: ");
    Serial.println(R);
    Serial.print("temperature: ");
    Serial.println(T);
    
     Serial.print("dht22: humidity: ");
    Serial.println(h);
    Serial.print("dht22: temperature: ");
    Serial.println(t);
    }
    
      // Open the Stream
      plotly.open_stream(1, 3, filename, layout); // plotlystream(number_of_points, number_of_traces, filename, layout)

      plotly.post(millis(),h); // post temperature to plotly (trace 0)
      delay(150);
      plotly.post(millis(),t); // post humidity to plotly (trace 1)
       delay(150);
      plotly.post(millis(),T); // post humidity to plotly (trace 2)
         delay(150);
  
    
      for(int i=0; i<300; i++){ //number of seconds to wait before posting again (300 = 5 minutes)
      delay(1000);
      if (plotly.VERBOSE) {
      Serial.println(i);
      }
      }
  }

Link to embedded display online: http://pvos.org/markstein/