ThingSpeak

[suthiporn]

ThingSpeak.txt

[suthiporn]

include

include "DHT.h"

include

define PUMP_RLY 4 // output drive relay for pump GPIO4 (D2)

define DHTPIN 2 // what pin we're connected to GPIO2 (D4)

define DHTTYPE DHT22 // DHT 11

define DEBUG

define DEBUG_PRINTER Serial

ifdef DEBUG

define DEBUG_PRINT(...) { DEBUG_PRINTER.print(VA_ARGS); }

define DEBUG_PRINTLN(...) { DEBUG_PRINTER.println(VA_ARGS); }

else

define DEBUG_PRINT(...) {}

define DEBUG_PRINTLN(...) {}

endif

const char ssid = "FITM WiFi"; const char password = "";

DHT *dht;

void connectWifi(); void reconnectWifiIfLinkDown(); void initDht(DHT *dht, uint8_t pin, uint8_t dht_type); void readDht(DHT dht, float temp, float humid); void uploadThingsSpeak(float t, float h);

void setup() { Serial.begin(115200); delay(10); pinMode(PUMP_RLY, OUTPUT); // Initialize the PUMP_RLY(4) pin as an output digitalWrite(PUMP_RLY, HIGH);// Make sure relay is normal off

connectWifi();

initDht(&dht, DHTPIN, DHTTYPE); }

void loop() { static float t_dht; static float h_dht;

readDht(dht, &t_dht, &h_dht); if(h_dht < 30 || t_dht > 26) // condition for make relay on { digitalWrite(PUMP_RLY, LOW); //If condition true do this! } else { digitalWrite(PUMP_RLY, HIGH); } uploadThingsSpeak(t_dht, h_dht);

// Wait a few seconds between measurements. delay(10 * 1000); reconnectWifiIfLinkDown(); }

void reconnectWifiIfLinkDown() { if (WiFi.status() != WL_CONNECTED) { DEBUG_PRINTLN("WIFI DISCONNECTED"); connectWifi(); } }

void connectWifi() { DEBUG_PRINTLN(); DEBUG_PRINTLN(); DEBUG_PRINT("Connecting to "); DEBUG_PRINTLN(ssid);

WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); DEBUG_PRINT("."); }

DEBUG_PRINTLN(""); DEBUG_PRINTLN("WiFi connected"); DEBUG_PRINTLN("IP address: "); DEBUG_PRINTLN(WiFi.localIP()); }

void initDht(DHT **dht, uint8_t pin, uint8_t dht_type) { // Connect pin 1 (on the left) of the sensor to +5V // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1 // to 3.3V instead of 5V! // Connect pin 2 of the sensor to whatever your DHTPIN is // Connect pin 4 (on the right) of the sensor to GROUND // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor for normal 16mhz Arduino // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you // might need to increase the threshold for cycle counts considered a 1 or 0. // You can do this by passing a 3rd parameter for this threshold. It's a bit // of fiddling to find the right value, but in general the faster the CPU the // higher the value. The default for a 16mhz AVR is a value of 6. For an // Arduino Due that runs at 84mhz a value of 30 works. // Example to initialize DHT sensor for Arduino Due: //DHT dht(DHTPIN, DHTTYPE, 30);

dht = new DHT(pin, dht_type, 30); (dht)->begin(); DEBUG_PRINTLN(F("DHTxx test!")) ; }

void uploadThingsSpeak(float t, float h) { static const char host = "api.thingspeak.com"; ///////////////// static const char apiKey = "QOKXKXO48TJW16EL"; ///////////////////////

// Use WiFiClient class to create TCP connections WiFiClient client; const int httpPort = 80; if (!client.connect(host, httpPort)) { DEBUG_PRINTLN("connection failed"); return; }

// We now create a URI for the request String url = "/update/"; // url += streamId; url += "?key="; url += apiKey; url += "&field1="; url += t; url += "&field2="; url += h;

DEBUG_PRINT("Requesting URL: "); DEBUG_PRINTLN(url);

// This will send the request to the server client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n"); }

void readDht(DHT dht, float temp, float *humid) {

if (dht == NULL) { DEBUG_PRINTLN(F("[dht11] is not initialised. please call initDht() first.")); return; }

// 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)) { DEBUG_PRINTLN("Failed to read from DHT sensor!"); return; }

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

DEBUG_PRINT("Humidity: "); DEBUG_PRINT(h); DEBUG_PRINT(" %\t"); DEBUG_PRINT("Temperature: "); DEBUG_PRINT(t); DEBUG_PRINT(" C "); DEBUG_PRINT(f); DEBUG_PRINT(" F\t"); DEBUG_PRINT("Heat index: "); DEBUG_PRINT(hi); DEBUG_PRINTLN(" *F");

temp = t; humid = h; }