diff --git a/arduino/HalMultiSensor/HalConfiguration.h b/arduino/HalMultiSensor/HalConfiguration.h
index c8a03155..4de98281 100755
--- a/arduino/HalMultiSensor/HalConfiguration.h
+++ b/arduino/HalMultiSensor/HalConfiguration.h
@@ -4,17 +4,18 @@
 #define ENABLE_DEBUG // comment out to disable debug
 
 #define TIMER_MILLISECOND 60*1000 // poling in minutes
+#define INDICATOR_PIN     13      // diod
 
 // POWER CONSUMPTION SENSOR
 #define POWERCON_ENABLED // comment out to disable sensor
 #define POWERCON_SENSOR         SensorBH1750()
-#define POWERCON_PROTOCOL       ProtocolOregon(118)
+#define POWERCON_PROTOCOL       ProtocolOregon(11, 118)
 #define POWER_TIMER_MULTIPLIER  1
 
 // TEMPERATURE SENSOR
 #define TEMPERATURE_ENABLED // comment out to disable sensor
-#define TEMPERATURE_SENSOR      SensorDHT11(5)
-#define TEMPERATURE_PROTOCOL    ProtocolOregon(100)
+#define TEMPERATURE_SENSOR      SensorDHT11(10)
+#define TEMPERATURE_PROTOCOL    ProtocolOregon(11, 100)
 #define TEMPERATURE_TIMER_MULTIPLIER 1
 
 // LIGHT SENSOR
diff --git a/arduino/HalMultiSensor/HalInterfaces.h b/arduino/HalMultiSensor/HalInterfaces.h
index 9ddf4780..03aa7ed9 100755
--- a/arduino/HalMultiSensor/HalInterfaces.h
+++ b/arduino/HalMultiSensor/HalInterfaces.h
@@ -3,7 +3,11 @@
 
 #include "HalConfiguration.h"
 
+// Utility functions
+
 #ifdef ENABLE_DEBUG
+    #include <Arduino.h>
+
     #define DEBUG(msg) \
         Serial.println(msg); \
         Serial.flush();
@@ -18,60 +22,81 @@
 #endif
 
 
+inline void pulse(short pin, short count)
+{
+    while (--count >= 0)
+    {
+        digitalWrite(INDICATOR_PIN, HIGH);
+        delay(150);
+        digitalWrite(INDICATOR_PIN, LOW);
+        if (count != 0) delay(200);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////
+// INTERFACES
+
 class Sensor
 {
 public:
     virtual void setup() = 0;
 };
-
-class SensorPowerConsumption : public Sensor
-{
-public:
-    // returns number of pulses from power meter
-    virtual unsigned int getConsumption() = 0;
-    virtual void reset() = 0;
-};
-
-class SensorTemperature : public Sensor
-{
-public:
-    virtual int getTemperature() = 0;
-    virtual int getHumidity() = 0;
-};
-
-class SensorLight : public Sensor
-{
-public:
-    virtual void setup() = 0;
-    virtual unsigned int getLuminosity() = 0;
-};
-
-
-
 class Protocol
 {
 public:
     virtual void setup() = 0;
-    virtual void send() = 0;
 };
 
+
+
+struct PowerData
+{
+    unsigned int consumption;
+};
+class SensorPowerConsumption : public Sensor
+{
+public:
+    // returns number of pulses from power meter
+    virtual void read(PowerData& data) = 0;
+};
 class ProtocolPowerConsumption : public Protocol
 {
 public:
-    virtual void setConsumption(unsigned int cons) = 0;
+    virtual void send(const PowerData& data) = 0;
 };
 
+
+struct TemperatureData
+{
+    float temperature;
+    short humidity;
+};
+class SensorTemperature : public Sensor
+{
+public:
+    virtual void read(TemperatureData& data) = 0;
+};
 class ProtocolTemperature : public Protocol
 {
 public:
-    virtual void setTemperature(float temp) = 0;
-    virtual void setHumidity(unsigned char humidity) = 0;
+    virtual void send(const TemperatureData& data) = 0;
 };
 
+
+struct LightData
+{
+    unsigned int lumen;
+};
+class SensorLight : public Sensor
+{
+public:
+    virtual void read(LightData& data) = 0;
+};
 class ProtocolLight : public Protocol
 {
 public:
-    virtual void setLuminosity(int lumen) = 0;
+    virtual void send(const LightData& data) = 0;
 };
 
+
 #endif // HALINTERFACES_H
diff --git a/arduino/HalMultiSensor/HalMultiSensor.ino b/arduino/HalMultiSensor/HalMultiSensor.ino
index 2c969790..cec66b59 100755
--- a/arduino/HalMultiSensor/HalMultiSensor.ino
+++ b/arduino/HalMultiSensor/HalMultiSensor.ino
@@ -3,7 +3,6 @@ A interrupt based sensor device that reads multiple sensors and transmits
 the data to a central location.
 */
 #include <Arduino.h>
-#include <Wire.h>
 
 #include "HalConfiguration.h"
 #include "HalInterfaces.h"
@@ -34,6 +33,7 @@ void setup()
     #ifdef ENABLE_DEBUG
     Serial.begin(9600);
     #endif
+    pinMode(INDICATOR_PIN, OUTPUT);
 
     // Setup Sensors and protocols
     #ifdef POWERCON_ENABLED
@@ -64,6 +64,8 @@ void setup()
     Interrupt::setCallback(timerInterruptFunc);
     Interrupt::setupWatchDogInterrupt(TIMER_MILLISECOND); // one minute scheduled interrupt
 
+
+    pulse(INDICATOR_PIN, 3);
     DEBUG("Ready");
 }
 
@@ -77,17 +79,17 @@ void timerInterruptFunc()
 
 void loop()
 {
+    digitalWrite(INDICATOR_PIN, HIGH);
     noInterrupts();
 
     // Send power consumption
     #ifdef POWERCON_ENABLED
     if(timerMultiplier == POWER_TIMER_MULTIPLIER)
     {
-        unsigned int consumption = powerSensor->getConsumption();
-        DEBUGF("Read POWERCON_SENSOR= consumption:%d", consumption);
-        powerSensor->reset();
-        powerProtocol->setConsumption(consumption);
-        powerProtocol->send();
+        static PowerData powerData;
+        powerSensor->read(powerData); // not needed, only here for future use
+        DEBUGF("Read POWERCON_SENSOR= consumption:%d", powerData.consumption);
+        powerProtocol->send(powerData);
     }
     #endif
 
@@ -95,12 +97,10 @@ void loop()
     #ifdef TEMPERATURE_ENABLED
     if(timerMultiplier == TEMPERATURE_TIMER_MULTIPLIER)
     {
-        unsigned int temperature = tempSensor->getTemperature();
-        unsigned int humidity = tempSensor->getHumidity();
-        DEBUGF("Read TEMPERATURE_SENSOR= temperature:%d, humidity:%d", temperature, humidity);
-        tempProtocol->setTemperature(temperature);
-        tempProtocol->setHumidity(humidity);
-        tempProtocol->send();
+        static TemperatureData tempData;
+        tempSensor->read(tempData);
+        DEBUGF("Read TEMPERATURE_SENSOR= temperature:%d, humidity:%d", tempData.temperature, tempData.humidity);
+        tempProtocol->send(tempData);
     }
     #endif
 
@@ -108,14 +108,15 @@ void loop()
     #ifdef LIGHT_ENABLED
     if(timerMultiplier == LIGHT_TIMER_MULTIPLIER)
     {
-        unsigned int lumen = lightSensor->getLuminosity();
-        DEBUG("Read LIGHT_SENSOR= lumen:%d", lumen);
-        lightProtocol->setLuminosity(lumen);
-        lightProtocol->send();
+        static LightData lightData;
+        lightSensor->read(lightData);
+        DEBUG("Read LIGHT_SENSOR= lumen:%d", lightData.lumen);
+        lightProtocol->send(lightData);
     }
     #endif
 
     interrupts();
+    digitalWrite(INDICATOR_PIN, LOW);
 
     DEBUG("Sleeping");
     Interrupt::sleep();
diff --git a/arduino/HalMultiSensor/ProtocolOregon.cpp b/arduino/HalMultiSensor/ProtocolOregon.cpp
index 392e13b7..21ec4166 100755
--- a/arduino/HalMultiSensor/ProtocolOregon.cpp
+++ b/arduino/HalMultiSensor/ProtocolOregon.cpp
@@ -1,35 +1,29 @@
 #include "ProtocolOregon.h"
 
-#define RF_TX_PIN 10
 #define RF_DELAY 512
 #define RF_DELAY_LONG RF_DELAY*2
-#define RF_SEND_HIGH() digitalWrite(RF_TX_PIN, HIGH)
-#define RF_SEND_LOW() digitalWrite(RF_TX_PIN, LOW)
+#define RF_SEND_HIGH() digitalWrite(txPin, HIGH)
+#define RF_SEND_LOW() digitalWrite(txPin, LOW)
 
 
 void ProtocolOregon::setup()
 {
-  pinMode(RF_TX_PIN, OUTPUT);
+  pinMode(txPin, OUTPUT);
   RF_SEND_LOW();
 }
 
-void ProtocolOregon::setTemperature(float temp)
+
+void ProtocolOregon::send(const PowerData& data)
 {
-    this->temperature = temp;
-}
-void ProtocolOregon::setHumidity(unsigned char humidity)
-{
-    this->humidity = humidity;
-}
-void ProtocolOregon::setConsumption(unsigned int cons)
-{
-    this->temperature = cons;
-    this->humidity = 0;
+    send(data.consumption, 0);
 }
 
+void ProtocolOregon::send(const TemperatureData& data)
+{
+    send(data.temperature, data.humidity);
+}
 
-
-void ProtocolOregon::send()
+void ProtocolOregon::send(float temperature, short humidity)
 {
     byte buffer[9];
     setType(buffer, 0x1A,0x2D); //temperature/humidity sensor (THGR2228N)
diff --git a/arduino/HalMultiSensor/ProtocolOregon.h b/arduino/HalMultiSensor/ProtocolOregon.h
index 76da986f..b5311ca6 100755
--- a/arduino/HalMultiSensor/ProtocolOregon.h
+++ b/arduino/HalMultiSensor/ProtocolOregon.h
@@ -8,18 +8,17 @@
 class ProtocolOregon : public ProtocolTemperature, public ProtocolPowerConsumption
 {
 public:
-    ProtocolOregon(unsigned char address) : address(address){};
+    ProtocolOregon(short pin, unsigned char address) : txPin(pin), address(address){};
 
     virtual void setup();
-    virtual void setTemperature(float temp);
-    virtual void setHumidity(unsigned char humidity);
-    virtual void setConsumption(unsigned int cons); //Power
-    virtual void send();
-private:
-    unsigned char address;
-    float temperature;
-    unsigned char humidity;
+    virtual void send(const TemperatureData& data);
+    virtual void send(const PowerData& data);
 
+private:
+    short txPin;
+    unsigned char address;
+
+    void send(float temperature, short humidity);
     void setType(byte *data, byte b1, byte b2);
     void setChannel(byte *data, byte channel);
     void setId(byte *data, byte id);
diff --git a/arduino/HalMultiSensor/SensorBH1750.cpp b/arduino/HalMultiSensor/SensorBH1750.cpp
index 9710334d..4562e1b3 100755
--- a/arduino/HalMultiSensor/SensorBH1750.cpp
+++ b/arduino/HalMultiSensor/SensorBH1750.cpp
@@ -15,6 +15,40 @@ based on Christopher Laws, March, 2013 code.
 #include <util/delay.h>
 
 
+#define BH1750_I2CADDR 0x23
+
+// No active state
+#define BH1750_POWER_DOWN 0x00
+
+// Waiting for measurement command
+#define BH1750_POWER_ON 0x01
+
+// Reset data register value - not accepted in POWER_DOWN mode
+#define BH1750_RESET 0x07
+
+// Start measurement at 1lx resolution. Measurement time is approx 120ms.
+#define BH1750_CONTINUOUS_HIGH_RES_MODE  0x10
+
+// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
+#define BH1750_CONTINUOUS_HIGH_RES_MODE_2  0x11
+
+// Start measurement at 4lx resolution. Measurement time is approx 16ms.
+#define BH1750_CONTINUOUS_LOW_RES_MODE  0x13
+
+// Start measurement at 1lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_HIGH_RES_MODE  0x20
+
+// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_HIGH_RES_MODE_2  0x21
+
+// Start measurement at 1lx resolution. Measurement time is approx 120ms.
+// Device is automatically set to Power Down after measurement.
+#define BH1750_ONE_TIME_LOW_RES_MODE  0x23
+
+
+
 void SensorBH1750::setup() {
   Wire.begin();
   configure(BH1750_CONTINUOUS_HIGH_RES_MODE);
@@ -30,69 +64,34 @@ void SensorBH1750::configure(uint8_t mode) {
         case BH1750_ONE_TIME_HIGH_RES_MODE_2:
         case BH1750_ONE_TIME_LOW_RES_MODE:
             // apply a valid mode change
-            write8(mode);
+            Wire.beginTransmission(BH1750_I2CADDR);
+            Wire.write(mode);
+            Wire.endTransmission();
             _delay_ms(10);
             break;
         default:
             // Invalid measurement mode
-            #if BH1750_DEBUG == 1
-            Serial.println("Invalid measurement mode");
-            #endif
+            DEBUG("Invalid measurement mode");
             break;
     }
 }
 
-unsigned int SensorBH1750::getConsumption()
-{
-    return pulses;
-}
-void SensorBH1750::reset()
+void SensorBH1750::read(PowerData& data)
 {
+    data.consumption = pulses;
     pulses = 0;
 }
 
-unsigned int SensorBH1750::getLuminosity(void) {
+void SensorBH1750::read(LightData& data) {
   uint16_t level;
 
   Wire.beginTransmission(BH1750_I2CADDR);
   Wire.requestFrom(BH1750_I2CADDR, 2);
-#if (ARDUINO >= 100)
   level = Wire.read();
   level <<= 8;
   level |= Wire.read();
-#else
-  level = Wire.receive();
-  level <<= 8;
-  level |= Wire.receive();
-#endif
   Wire.endTransmission();
 
-#if BH1750_DEBUG == 1
-  Serial.print("Raw light level: ");
-  Serial.println(level);
-#endif
-
-  level = level/1.2; // convert to lux
-
-#if BH1750_DEBUG == 1
-  Serial.print("Light level: ");
-  Serial.println(level);
-#endif
-  return level;
-}
-
-
-
-/*********************************************************************/
-
-
-void SensorBH1750::write8(uint8_t d) {
-  Wire.beginTransmission(BH1750_I2CADDR);
-#if (ARDUINO >= 100)
-  Wire.write(d);
-#else
-  Wire.send(d);
-#endif
-  Wire.endTransmission();
+  data.lumen = level/1.2; // convert to lux
 }
 
diff --git a/arduino/HalMultiSensor/SensorBH1750.h b/arduino/HalMultiSensor/SensorBH1750.h
index 5a6f91a2..cb139272 100755
--- a/arduino/HalMultiSensor/SensorBH1750.h
+++ b/arduino/HalMultiSensor/SensorBH1750.h
@@ -1,17 +1,3 @@
-/*
-
-This is a library for the BH1750FVI Digital Light Sensor
-breakout board.
-
-The board uses I2C for communication. 2 pins are required to
-interface to the device.
-
-Datasheet:
-http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
-
-based on Christopher Laws, March, 2013 code.
-
-*/
 #ifndef SensorBH1750_H
 #define SensorBH1750_H
 
@@ -19,52 +5,16 @@ based on Christopher Laws, March, 2013 code.
 #include "HalInterfaces.h"
 
 
-#define BH1750_DEBUG 0
-
-#define BH1750_I2CADDR 0x23
-
-// No active state
-#define BH1750_POWER_DOWN 0x00
-
-// Waiting for measurement command
-#define BH1750_POWER_ON 0x01
-
-// Reset data register value - not accepted in POWER_DOWN mode
-#define BH1750_RESET 0x07
-
-// Start measurement at 1lx resolution. Measurement time is approx 120ms.
-#define BH1750_CONTINUOUS_HIGH_RES_MODE  0x10
-
-// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
-#define BH1750_CONTINUOUS_HIGH_RES_MODE_2  0x11
-
-// Start measurement at 4lx resolution. Measurement time is approx 16ms.
-#define BH1750_CONTINUOUS_LOW_RES_MODE  0x13
-
-// Start measurement at 1lx resolution. Measurement time is approx 120ms.
-// Device is automatically set to Power Down after measurement.
-#define BH1750_ONE_TIME_HIGH_RES_MODE  0x20
-
-// Start measurement at 0.5lx resolution. Measurement time is approx 120ms.
-// Device is automatically set to Power Down after measurement.
-#define BH1750_ONE_TIME_HIGH_RES_MODE_2  0x21
-
-// Start measurement at 1lx resolution. Measurement time is approx 120ms.
-// Device is automatically set to Power Down after measurement.
-#define BH1750_ONE_TIME_LOW_RES_MODE  0x23
-
-
 class SensorBH1750 : public SensorPowerConsumption, public SensorLight{
 public:
     virtual void setup();
-    virtual unsigned int getLuminosity();
-    virtual unsigned int getConsumption();
-    virtual void reset();
+    virtual void read(PowerData& data);
+    virtual void read(LightData& data);
 
-    void configure(uint8_t mode);
 private:
     unsigned int pulses;
-    void write8(uint8_t data);
+
+    void configure(uint8_t mode);
 
 };
 
diff --git a/arduino/HalMultiSensor/SensorDHT11.cpp b/arduino/HalMultiSensor/SensorDHT11.cpp
index 28cf7b0e..deb01d8e 100755
--- a/arduino/HalMultiSensor/SensorDHT11.cpp
+++ b/arduino/HalMultiSensor/SensorDHT11.cpp
@@ -13,40 +13,22 @@
 // + added comments
 // + removed all non DHT11 specific code
 // + added references
+// Refactored by Ziver Koc
 //
 
 #include "SensorDHT11.h"
 
 
-SensorDHT11::SensorDHT11(int pin)
-{
-    this->pin = pin;
-}
-
 void SensorDHT11::setup(){}
-int SensorDHT11::getTemperature()
-{
-    return temperature;
-}
-int SensorDHT11::getHumidity()
-{
-    return humidity;
-}
 
-// returnvalues:
-//  0 : OK
-// -1 : checksum error
-// -2 : timeout
-int SensorDHT11::read()
+
+void SensorDHT11::read(TemperatureData& data)
 {
 	// BUFFER TO RECEIVE
-	uint8_t bits[5];
+	uint8_t bits[5] = {0};
 	uint8_t cnt = 7;
 	uint8_t idx = 0;
 
-	// EMPTY BUFFER
-	for (int i=0; i< 5; i++) bits[i] = 0;
-
 	// REQUEST SAMPLE
 	pinMode(pin, OUTPUT);
 	digitalWrite(pin, LOW);
@@ -58,24 +40,40 @@ int SensorDHT11::read()
 	// ACKNOWLEDGE or TIMEOUT
 	unsigned int loopCnt = 10000;
 	while(digitalRead(pin) == LOW)
-		if (loopCnt-- == 0) return -2;
+		if (loopCnt-- == 0)
+		{
+		    DEBUG("DHT11 timeout");
+		    return;;
+		}
 
 	loopCnt = 10000;
 	while(digitalRead(pin) == HIGH)
-		if (loopCnt-- == 0) return -2;
+		if (loopCnt-- == 0)
+        {
+            DEBUG("DHT11 timeout");
+            return;;
+        }
 
 	// READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT
 	for (int i=0; i<40; i++)
 	{
 		loopCnt = 10000;
 		while(digitalRead(pin) == LOW)
-			if (loopCnt-- == 0) return -2;
+			if (loopCnt-- == 0)
+			{
+                DEBUG("DHT11 timeout");
+                return;;
+            }
 
 		unsigned long t = micros();
 
 		loopCnt = 10000;
 		while(digitalRead(pin) == HIGH)
-			if (loopCnt-- == 0) return -2;
+			if (loopCnt-- == 0)
+            {
+                DEBUG("DHT11 timeout");
+                return;;
+            }
 
 		if ((micros() - t) > 40) bits[idx] |= (1 << cnt);
 		if (cnt == 0)   // next byte?
@@ -86,14 +84,14 @@ int SensorDHT11::read()
 		else cnt--;
 	}
 
-	// WRITE TO RIGHT VARS
+
+	uint8_t sum = bits[0] + bits[2];
+	if (bits[4] != sum)
+        DEBUG("DHT11 checksum error");
+
+    // WRITE TO RIGHT VARS
         // as bits[1] and bits[3] are allways zero they are omitted in formulas.
-	humidity    = bits[0]; 
-	temperature = bits[2]; 
-
-	uint8_t sum = bits[0] + bits[2];  
-
-	if (bits[4] != sum) return -1;
-	return 0;
+    data.temperature = bits[2];
+    data.humidity    = bits[0];
 }
 
diff --git a/arduino/HalMultiSensor/SensorDHT11.h b/arduino/HalMultiSensor/SensorDHT11.h
index 329332f8..40bba2e8 100755
--- a/arduino/HalMultiSensor/SensorDHT11.h
+++ b/arduino/HalMultiSensor/SensorDHT11.h
@@ -1,37 +1,19 @@
-// 
-//    FILE: dht11.h
-// VERSION: 0.3.2
-// PURPOSE: DHT11 Temperature & Humidity Sensor library for Arduino
-// LICENSE: GPL v3 (http://www.gnu.org/licenses/gpl.html)
-//
-// DATASHEET: http://www.micro4you.com/files/sensor/DHT11.pdf
-//
-//     URL: http://arduino.cc/playground/Main/DHT11Lib
-//
-// HISTORY:
-// George Hadjikyriacou - Original version
-// see dht.cpp file
-// *** Terry King: Changed include Arduino.h for 1.0x  
-#ifndef dht11_h
-#define dht11_h
+#ifndef SensorDHT11_h
+#define SensorDHT11_h
 
 #include <Arduino.h>
 #include "HalInterfaces.h"
 
-#define DHT11LIB_VERSION "0.3.2"
 
 class SensorDHT11 : public SensorTemperature
 {
 public:
-    SensorDHT11(int pin);
+    SensorDHT11(short pin) : pin(pin) {};
+
     virtual void setup();
-    virtual int getTemperature();
-    virtual int getHumidity();
-    int read();
+    virtual void read(TemperatureData& data);
 
 private:
-    unsigned int pin;
-    float temperature;
-    unsigned char humidity;
+    short pin;
 };
 #endif
diff --git a/arduino/HalMultiSensor/SensorPhotocell.cpp b/arduino/HalMultiSensor/SensorPhotocell.cpp
index 46eafa9c..22a7c4c9 100755
--- a/arduino/HalMultiSensor/SensorPhotocell.cpp
+++ b/arduino/HalMultiSensor/SensorPhotocell.cpp
@@ -7,9 +7,9 @@ void SensorPhotocell::setup()
     Interrupt::setupPinInterrupt(PC2); //PC3
 }
 
-unsigned int SensorPhotocell::getConsumption()
+void SensorPhotocell::read(PowerData& data)
 {
-    return pulse;
+    data.consumption = pulse;
 }
 
 void SensorPhotocell::reset()
diff --git a/arduino/HalMultiSensor/SensorPhotocell.h b/arduino/HalMultiSensor/SensorPhotocell.h
index 9c6d6079..359c8916 100755
--- a/arduino/HalMultiSensor/SensorPhotocell.h
+++ b/arduino/HalMultiSensor/SensorPhotocell.h
@@ -9,11 +9,10 @@ class SensorPhotocell : public SensorPowerConsumption
 {
 public:
     virtual void setup();
-    virtual unsigned int getConsumption();
+    virtual void read(PowerData& data);
     virtual void reset();
 
 private:
-    Interrupt* interrupt;
     unsigned int pulse;
 };