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ESP-01_Temp_Hum_Logger.ino

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+
+/**
+ * BasicHTTPClient.ino
+ *
+ *  Created on: 24.05.2015
+ *
+ */
+
+#include <Arduino.h>
+
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+
+#include <DHT_U.h>
+#include <Adafruit_Sensor.h>
+
+const char*     ssid = "YOUR-WIFI-SSID";
+const char* password = "YOUR-WIFI-PASSWD";
+
+// Define Pin for Sensor - I use GPIO2
+#define DHTPIN 2
+
+// Uncomment whatever type you're using!
+#define DHTTYPE DHT11     // DHT 11 
+//#define DHTTYPE DHT22   // DHT 22  (AM2302)
+//#define DHTTYPE DHT21   // DHT 21 (AM2301)
+
+// init DHT; 3rd parameter = 16 works for ESP8266@80MHz
+// FixMe: What is the third parameter??
+DHT dht(DHTPIN, DHTTYPE, 16); 
+
+
+// Generally, you should use "unsigned long" for variables that hold time
+const long interval = 2000;              // interval at which to read sensor
+const String url="http://YOUR-SERVER-NAME/get_temp.php";
+
+unsigned long previousMillis = 0;        // will store last temp was read
+float hum, temp;  // Values read from sensor
+unsigned int counter;
+
+void setup() {
+
+    counter = 0;
+
+    for(uint8_t t = 4; t > 0; t--) {
+        delay(1000);
+    }
+
+    Serial.begin(115200);   Serial.println("");
+    WiFi.begin(ssid, password);
+
+
+    // Wait for connection
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        Serial.print(".");
+    }
+    Serial.println("");
+    Serial.print("Connected to "); Serial.println(ssid);
+    Serial.print("IP address: "); Serial.println(WiFi.localIP());
+}
+
+void gettemperature() {
+  // Wait at least 2 seconds seconds between measurements.
+  // if the difference between the current time and last time you read
+  // the sensor is bigger than the interval you set, read the sensor
+  // Works better than delay for things happening elsewhere also
+  unsigned long currentMillis = millis();
+
+  if(currentMillis - previousMillis >= interval) {
+    // save the last time you read the sensor 
+    previousMillis = currentMillis;   
+
+    // Reading temperature for humidity takes about 250 milliseconds!
+    // Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
+    hum  = dht.readHumidity();          // Read humidity (percent)
+    temp = dht.readTemperature();     // Read temperature as Celsius ...(true)=Fahrenheit
+    // Check if any reads failed and exit early (to try again).
+    if (isnan(hum) || isnan(temp)) {
+      return;
+    }
+  }
+}
+
+void loop() {
+
+    String url_act;
+
+    // wait for WiFi connection
+    if((WiFi.status() == WL_CONNECTED)) {
+
+        gettemperature();
+
+        HTTPClient http;
+        Serial.println("HTTP Start");
+
+        url_act  = url;
+        url_act += "?temp=";    url_act += temp;
+        url_act += "&hum=";     url_act += hum;
+        url_act += "&counter="; url_act += counter;
+
+        Serial.print("URL="); Serial.println(url_act);
+        http.begin(url_act); //HTTP-Client
+
+        // start connection and send HTTP header
+        int httpCode = http.GET();
+
+        // httpCode will be negative on error
+        if(httpCode > 0) {
+            // HTTP header has been send and Server response header has been handled
+            // file found at server
+            Serial.println("HTTP Code OK");
+            if(httpCode == HTTP_CODE_OK) {
+                String payload = http.getString();
+            }
+        } else {
+            // We do nothing if something did not work...
+            Serial.println("HTTP Not OK");
+        }
+        http.end();
+        Serial.println("HTTP End");
+    }
+  counter++;
+  delay(10000);
+  Serial.println("----- Next Loop -----"); Serial.println("");
+}
+
+