diff --git a/things/Device.h b/things/Device.h
new file mode 100644
index 0000000..decfd91
--- /dev/null
+++ b/things/Device.h
@@ -0,0 +1,12 @@
+#ifndef DEVICE_H
+#define DEVICE_H
+
+class Device {
+  public:
+    // purely virtual functions, need to be implemented
+    virtual void setup() = 0;
+    virtual void homieRegister() = 0;
+    virtual void loop() = 0;
+};
+
+#endif
diff --git a/things/DeviceLdr.h b/things/DeviceLdr.h
new file mode 100644
index 0000000..3b08adb
--- /dev/null
+++ b/things/DeviceLdr.h
@@ -0,0 +1,51 @@
+#ifndef DEVICELDR_H
+#define DEVICELDR_H
+
+#include "Device.h"
+#include <Homie.h>
+
+class DeviceLdr : public Device {
+  public:
+    inline DeviceLdr(byte ldrPin) {
+      pin = ldrPin;
+    }
+    virtual void setup();
+    virtual void homieRegister();
+    virtual void loop();
+  private:
+    byte pin;
+    const int INTERVAL_LDR = 60;
+    unsigned long lastSentLDR = 0;
+    int ldr = 0;
+    HomieNode ldrNode{"ldr", "ldr"};
+};
+
+void DeviceLdr::setup() {
+  pinMode(pin, INPUT);
+}
+
+void DeviceLdr::homieRegister() {
+  Homie.registerNode(ldrNode);
+}
+
+void DeviceLdr::loop() {
+  if (millis() - lastSentLDR >= INTERVAL_LDR * 1000UL || lastSentLDR == 0) {
+    int ldr_new = analogRead(pin);
+    if (ldr_new != ldr) {
+      ldr = ldr_new;
+      float ldr_float = map(ldr, 0, 1023, 0, 10000) / 100.0;
+      Serial.print("LDR: ");
+      Serial.println(ldr_float);
+      if (!Homie.setNodeProperty(ldrNode, "value", String(ldr_float), true)) {
+        Serial.println("Sending failed");
+      }
+    } else {
+      Serial.println("LDR value unchanged");
+    }
+    lastSentLDR = millis();
+  }
+}
+
+#endif
+
+
diff --git a/things/things.ino b/things/things.ino
index c53e485..f0a0b85 100644
--- a/things/things.ino
+++ b/things/things.ino
@@ -1,6 +1,8 @@
 #include <Homie.h>  // https://github.com/marvinroger/homie-esp8266
 #include <DHT.h>    // https://github.com/adafruit/DHT-sensor-library
 
+#include "DeviceLdr.h"
+
 #define HAS_LDR
 #define HAS_LED
 #undef HAS_DHT
@@ -16,10 +18,7 @@ int led_blue = 0;
 
 // HAS_LDR
 #define PIN_LDR A0
-HomieNode ldrNode("ldr", "ldr");
-const int INTERVAL_LDR = 60;
-unsigned long lastSentLDR = 0;
-int ldr = 0;
+DeviceLdr deviceLdr(PIN_LDR);
 
 // HAS_DHT
 #define PIN_DHT D4
@@ -35,7 +34,7 @@ float heatindex;              // computed value from the sensor
 
 void setupHandler() {
   #ifdef HAS_LDR
-    pinMode(PIN_LDR, INPUT);
+    deviceLdr.setup();
   #endif
   #ifdef HAS_LED
     pinMode(PIN_LED_RED, OUTPUT);
@@ -107,24 +106,6 @@ bool isEqual(float a, float b, float epsilon=0.001) {
   return fabs(a - b) <= epsilon * fabs(a);
 }
 
-void loopHandlerLDR() {
-  if (millis() - lastSentLDR >= INTERVAL_LDR * 1000UL || lastSentLDR == 0) {
-    int ldr_new = analogRead(PIN_LDR);
-    if (ldr_new != ldr) {
-      ldr = ldr_new;
-      float ldr_float = map(ldr, 0, 1023, 0, 10000) / 100.0;
-      Serial.print("LDR: ");
-      Serial.println(ldr_float);
-      if (!Homie.setNodeProperty(ldrNode, "value", String(ldr_float), true)) {
-        Serial.println("Sending failed");
-      }
-    } else {
-      Serial.println("LDR value unchanged");
-    }
-    lastSentLDR = millis();
-  }
-}
-
 void loopHandlerDHT() {
   if (millis() - lastSentDHT >= INTERVAL_DHT * 1000UL || lastSentDHT == 0) {
     float previousHumidity = humidity;
@@ -176,7 +157,7 @@ void loopHandlerDHT() {
 
 void loopHandler() {
   #ifdef HAS_LDR
-  loopHandlerLDR();
+  deviceLdr.loop();
   #endif
   #ifdef HAS_DHT
   loopHandlerDHT();
@@ -186,7 +167,7 @@ void loopHandler() {
 void setup() {
   Homie.setFirmware("things", "1.0.0");
   #ifdef HAS_LDR
-  Homie.registerNode(ldrNode);
+  deviceLdr.homieRegister();
   #endif
   #ifdef HAS_LED
   ledNode.subscribe("on", ledOnHandler);