diff --git a/nano/Lichtschranke_TCST2103/Lichtschranke_TCST2103.ino b/nano/Lichtschranke_TCST2103/Lichtschranke_TCST2103.ino
new file mode 100644
index 0000000..bdde16f
--- /dev/null
+++ b/nano/Lichtschranke_TCST2103/Lichtschranke_TCST2103.ino
@@ -0,0 +1,39 @@
+// https://www.youtube.com/watch?v=po_lHVKFQWI
+// http://heliosoph.mit-links.info/photointerrupter-basics/
+
+/*
++5V --220 Ohm--      ---- GND
+              |      |
+              +      D
+              TCST2103
+              E      +
+              |      |
+       GND ----      ----10kOhm---- +5V
+                     |
+                     |
+                     ----A0 PIN
+*/
+
+
+int sensorPin = A0;
+int sensorValue = 0;
+int ledPin = LED_BUILTIN;
+ 
+void setup() {
+  pinMode(ledPin, OUTPUT);
+  Serial.begin(9600);
+}
+ 
+void loop() {
+  sensorValue = analogRead(sensorPin);
+  Serial.println(sensorValue);
+
+  if (sensorValue > 512) {
+    digitalWrite(ledPin, HIGH);
+  }
+  else { 
+    digitalWrite(ledPin, LOW);
+  }
+  
+  delay(200);
+}