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libraries/ESP32_Firebase/examples/RobotController/RobotController.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 
+*/
+
+#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 M1A 3 // D5: Output 1 for motor driver
+#define M1B 4 // D6: Output 2 for motor driver
+#define M2A 5 // D7: Output 3 for motor driver
+#define M2B 6 // D8: Output 4 for motor driver
+
+#define TURN_DELAY 100
+#define FORWARD_BACKWARD_DELAY 500
+
+Firebase firebase(REFERENCE_URL);
+
+void setup() {
+  Serial.begin(115200);
+  pinMode(M1A, OUTPUT);
+  pinMode(M1B, OUTPUT);
+  pinMode(M2A, OUTPUT);
+  pinMode(M2B, OUTPUT);
+
+  digitalWrite(M1A, LOW);
+  digitalWrite(M1B, LOW);
+  digitalWrite(M2A, LOW);
+  digitalWrite(M2B, LOW);
+
+  // 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);
+}
+
+void loop() {
+  int command = firebase.getInt("cmd/Robot"); // Get data from database.
+
+  if(command == 0){ //  STOP
+    digitalWrite(M1A, LOW);
+    digitalWrite(M1B, LOW);
+    digitalWrite(M2A, LOW);
+    digitalWrite(M2B, LOW);
+  }
+
+  if(command == 1){ //  FORWARD
+    digitalWrite(M1A, HIGH);
+    digitalWrite(M2A, HIGH);
+    delay(FORWARD_BACKWARD_DELAY);
+    digitalWrite(M1A, LOW);
+    digitalWrite(M2A, LOW);
+  }
+
+  if(command == 2){ //  BACKWARD
+    digitalWrite(M1B, HIGH);
+    digitalWrite(M2B, HIGH);
+    delay(FORWARD_BACKWARD_DELAY);
+    digitalWrite(M1B, LOW);
+    digitalWrite(M2B, LOW);
+  }
+
+  if(command == 3){ //  LEFT
+    digitalWrite(M1B, HIGH);
+    digitalWrite(M2A, HIGH);
+    delay(TURN_DELAY);
+    digitalWrite(M1B, LOW);
+    digitalWrite(M2A, LOW);
+  }
+
+  if(command == 4){ //  RIGHT
+    digitalWrite(M1A, HIGH);
+    digitalWrite(M2B, HIGH);
+    delay(TURN_DELAY);
+    digitalWrite(M1A, LOW);
+    digitalWrite(M2B, LOW);
+  }
+}