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// 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);
}
}
}
@dwblair

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@dwblair dwblair commented Feb 26, 2014

This is for "olm-1" in the Markstein lab

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@dwblair dwblair commented Feb 26, 2014

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

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