[ES] Aufgabe 4.2 fertiggestellt

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

es/blatt4/uebung4-2/uebung4-2.ino

@@ -0,0 +1,50 @@
+#include <Wire.h>
+
+// these variables describe the used hardware pins
+// adjust them when you use other pins
+// hardware pins
+int ledPin = 13;
+int analogLevel = 0;
+
+int slaveAddress = 4;
+
+/**
+ * Setup function for initial setup code
+ */
+void setup() {
+    // Configure pins
+    Wire.begin();
+    Wire.onReceive(receiveEvent);
+
+    // initialize serial port
+    Serial.begin(9600);
+}
+
+/**
+ * Loop function for main code
+ */
+void loop() {
+  Wire.beginTransmission(slaveAddress);
+  Wire.write(1);
+  Wire.endTransmission();
+  delay(100);
+  Wire.beginTransmission(slaveAddress);
+  Wire.write('r');
+  Wire.endTransmission();
+  delay(1900);
+  Wire.beginTransmission(slaveAddress);
+  Wire.write(0);
+  Wire.endTransmission();
+  delay(100);
+  Wire.beginTransmission(slaveAddress);
+  Wire.write('r');
+  Wire.endTransmission();
+  delay(1900);
+}
+
+void receiveEvent(int readBytes)
+{
+  int x = Wire.read();
+  Serial.print("Result: ");
+  Serial.println(x ? "on" : "off");
+}