[ES] Added 4.1

Signed-off-by: Jim Martens <github@2martens.de>

es/blatt4/uebung4-1/uebung4-1.ino

@@ -0,0 +1,44 @@
+// these variables describe the used hardware pins
+// adjust them when you use other pins
+// hardware pins
+int ledPin = 13;
+int analogLevel = 0;
+
+/**
+ * Setup function for initial setup code
+ */
+void setup() {
+    // Configure pins
+    analogWrite(ledPin, 0);
+
+    // initialize serial port
+    Serial.begin(9600);
+    Serial2.begin(9600);
+}
+
+/**
+ * Loop function for main code
+ */
+void loop() {
+  if (Serial2.available() > 0) {
+    char command = Serial2.read();
+    if (command == '1') {
+      for (int i = 0; i < 255; i++) {
+        analogLevel += 1;
+        analogWrite(ledPin, analogLevel);
+        Serial.print("LED-Level: ");
+        Serial.println(analogLevel);
+        delay(19);
+      }
+      Serial2.print('1');
+      for (int i = 255; i > 0; i--) {
+        analogLevel -= 1;
+        analogWrite(ledPin, analogLevel);
+        Serial.print("LED-Level: ");
+        Serial.println(analogLevel);
+        delay(19);
+      }
+      Serial2.print('2');
+    }
+  }
+}