Initial working Telegram bot, LDR and LED

Arduino/Arduino.ino

@@ -0,0 +1,23 @@
+#define LEDPIN 8
+
+String incomingString;
+
+void setup() {
+  pinMode(LEDPIN, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  if (Serial.available() > 0) {
+    char cmd = Serial.read();
+    if (cmd == 'O') {
+      digitalWrite(LEDPIN, HIGH);  // Open
+    } else if (cmd == 'C') {
+      digitalWrite(LEDPIN, LOW);   // Close
+    } else if (cmd == 'R') {
+      int ldrValue = analogRead(A0);
+      Serial.println(ldrValue);
+    }
+  }
+  delay(50);
+}