Freezer sensor on Wemos D1

freezer/freezer.ino/freezer.ino.ino

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+/*
+ * Freezer Reed Contact Door Sensor
+ * by Tilman Liero
+ * www.tilman.de
+ *
+ * on = door open
+ * off = door closed
+ * 
+ * Sources:
+ * WEMOS D1 WiFi setup: https://averagemaker.com/2018/04/how-to-set-up-wifi-on-a-wemos.html
+ * ESP8266 web server: https://randomnerdtutorials.com/esp8266-web-server/
+ * Digital Input Pull-Up Resistor: https://docs.arduino.cc/tutorials/generic/digital-input-pullup/
+ */
+
+#include <ESP8266WiFi.h>
+//#include <ESP8266HTTPClient.h>
+//#include <WiFiClient.h>
+
+const char* ssid     = "LeWe";
+const char* password = "5275274365464843";
+
+WiFiServer server(8081);
+String header;
+
+
+void setup()
+{
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  Serial.println("Reed switch on D2");
+  pinMode(D2, INPUT_PULLUP);
+
+  // start serial output
+  Serial.begin(115200);
+  Serial.println();
+
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+  WiFi.hostname("Freezer-Sensor");
+  WiFi.begin(ssid, password);
+ 
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.print("WiFi connected, IP address: ");
+  Serial.println(WiFi.localIP());
+  WiFi.setAutoReconnect(true);
+  WiFi.persistent(true);
+
+  server.begin();
+  delay(500);
+  
+  Serial.println("Setup completed");
+}
+
+
+void loop() {
+
+  if (digitalRead(D2) == HIGH) {
+    digitalWrite(LED_BUILTIN, LOW); // D1 Mini: turns the LED *on*
+  }
+  else {
+    digitalWrite(LED_BUILTIN, HIGH); // D1 Mini: turns the LED *off*
+  }
+
+  WiFiClient client = server.available();   // Listen for incoming clients
+  
+  if (client) {
+    String currentLine = "";                // make a String to hold incoming data from the client
+    while (client.connected()) {            // loop while the client's connected
+      if (client.available()) {             // if there's bytes to read from the client,
+        char c = client.read();             // read a byte, then
+        //Serial.write(c);                    // print it out the serial monitor
+        header += c;
+        if (c == '\n') {                    // if the byte is a newline character
+          // if the current line is blank, you got two newline characters in a row.
+          // that's the end of the client HTTP request, so send a response:
+          if (currentLine.length() == 0) {
+            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
+            // and a content-type so the client knows what's coming, then a blank line:
+            client.println("HTTP/1.1 200 OK");
+            client.println("Content-type: text/html; charset=utf-8");
+            client.println("Connection: close");
+            client.println();
+            
+            // Display the HTML web page
+            if (digitalRead(D2) == HIGH) {
+              client.println("{ \"open\": true }");
+            }
+            else {
+              client.println("{ \"open\": false }");
+            }
+            
+            // The HTTP response ends with another blank line
+            client.println();
+            break;
+          }
+          else { // if you got a newline, then clear currentLine
+            currentLine = "";
+          }
+        }
+        else if (c != '\r') {  // if you got anything else but a carriage return character,
+          currentLine += c;      // add it to the end of the currentLine
+        }
+      }
+    }
+    // Clear the header variable
+    header = "";
+    // Close the connection
+    client.stop();
+    Serial.println("Client disconnected");
+    Serial.println("");
+  }
+}