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libraries/ESP32_Firebase/examples/HomeAutomation/HomeAutomation.ino

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+/*
+  Make sure your Firebase project's '.read' and '.write' rules are set to 'true'. 
+  Ignoring this will prevent the MCU from communicating with the database. 
+  For more details- https://github.com/Rupakpoddar/ESP32Firebase 
+
+  Download the Android app from- https://play.google.com/store/apps/details?id=com.rupak.firebaseremote
+  Online remote (Works with any web browser)- https://rupakpoddar.github.io/Firebase-automation-web-interface/
+  Use Python to control devices- https://github.com/Rupakpoddar/Firebase-with-python
+*/
+
+#include <ArduinoJson.h>            // https://github.com/bblanchon/ArduinoJson 
+#include <ESP32Firebase.h>
+
+#define _SSID "ENTER HERE"          // Your WiFi SSID 
+#define _PASSWORD "ENTER HERE"      // Your WiFi Password 
+#define REFERENCE_URL "ENTER HERE"  // Your Firebase project reference url 
+
+#define device1 3 // D5
+#define device2 4 // D6
+#define device3 5 // D7
+#define device4 6 // D8
+int device_list[4] = {device1, device2, device3, device4};
+
+Firebase firebase(REFERENCE_URL);
+
+void setup() {
+  Serial.begin(115200);
+  pinMode(device1, OUTPUT);
+  pinMode(device2, OUTPUT);
+  pinMode(device3, OUTPUT);
+  pinMode(device4, OUTPUT);
+  // pinMode(LED_BUILTIN, OUTPUT);
+  // digitalWrite(LED_BUILTIN, LOW);
+  WiFi.mode(WIFI_STA);
+  WiFi.disconnect();
+  delay(1000);
+
+  // Connect to WiFi
+  Serial.println();
+  Serial.println();
+  Serial.print("Connecting to: ");
+  Serial.println(_SSID);
+  WiFi.begin(_SSID, _PASSWORD);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print("-");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi Connected");
+
+  // Print the IP address
+  Serial.print("IP Address: ");
+  Serial.print("http://");
+  Serial.print(WiFi.localIP());
+  Serial.println("/");
+  // digitalWrite(LED_BUILTIN, HIGH);
+
+  firebase.json(true);  // Make sure to add this line. 
+}
+
+void loop() {
+  String data = firebase.getString("cmd");  // Get data from database.
+
+  // Deserialize the data.
+  // Consider using the Arduino Json assistant- https://arduinojson.org/v6/assistant/
+  const size_t capacity = JSON_OBJECT_SIZE(5) + 60;
+  DynamicJsonDocument doc(capacity);
+
+  deserializeJson(doc, data);
+
+  String Device1 = doc["Device1"];
+  String Device2 = doc["Device2"];
+  String Device3 = doc["Device3"];
+  String Device4 = doc["Device4"];
+
+  // Print data
+  Serial.println("Device 1: "+Device1);
+  Serial.println("Device 2: "+Device2);
+  Serial.println("Device 3: "+Device3);
+  Serial.println("Device 4: "+Device4);
+  Serial.println("");
+
+  String status_list[4] = {Device1, Device2, Device3, Device4};
+
+  for (int i=0;i<4;i++) {
+    if (status_list[i] == "ON"){
+      digitalWrite(device_list[i], HIGH);
+    }
+    else{
+      digitalWrite(device_list[i], LOW);
+    }
+  }
+}