diff --git a/code/espurna/config/hardware.h b/code/espurna/config/hardware.h
index 832e139b..d9682a45 100644
--- a/code/espurna/config/hardware.h
+++ b/code/espurna/config/hardware.h
@@ -219,8 +219,12 @@
     #define LED1_PIN_INVERSE    1
 
     // Jack is connected to GPIO14 (and with a small hack to GPIO4)
-    #define I2C_SDA_PIN         4
-    #define I2C_SCL_PIN         14
+    #define DALLAS_SUPPORT      1
+    #define DALLAS_PIN          14
+    #define DHT_SUPPORT         1
+    #define DHT_PIN             14
+    //#define I2C_SDA_PIN         4
+    //#define I2C_SCL_PIN         14
 
 #elif defined(ITEAD_SONOFF_SV)
 
diff --git a/code/espurna/config/prototypes.h b/code/espurna/config/prototypes.h
index dc004ded..0e081647 100644
--- a/code/espurna/config/prototypes.h
+++ b/code/espurna/config/prototypes.h
@@ -56,6 +56,13 @@ unsigned char i2cFindAndLock(size_t size, unsigned char * addresses);
 bool i2cGetLock(unsigned char address);
 bool i2cReleaseLock(unsigned char address);
 
+// -----------------------------------------------------------------------------
+// GPIO
+// -----------------------------------------------------------------------------
+bool gpioValid(unsigned char gpio);
+bool gpioGetLock(unsigned char gpio);
+bool gpioReleaseLock(unsigned char gpio);
+
 // -----------------------------------------------------------------------------
 // Debug
 // -----------------------------------------------------------------------------
diff --git a/code/espurna/gpio.ino b/code/espurna/gpio.ino
new file mode 100644
index 00000000..b9bfae8b
--- /dev/null
+++ b/code/espurna/gpio.ino
@@ -0,0 +1,37 @@
+/*
+
+GPIO MODULE
+
+Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
+
+*/
+
+bool _gpio_locked[16] = {false};
+
+bool gpioValid(unsigned char gpio) {
+    if (0 <= gpio && gpio <= 5) return true;
+    if (12 <= gpio && gpio <= 15) return true;
+    return false;
+}
+
+bool gpioGetLock(unsigned char gpio) {
+    if (gpioValid(gpio)) {
+        if (!_gpio_locked[gpio]) {
+            _gpio_locked[gpio] = true;
+            DEBUG_MSG_P(PSTR("[GPIO] GPIO%d locked\n"), gpio);
+            return true;
+        }
+    }
+    DEBUG_MSG_P(PSTR("[GPIO] Failed getting lock for GPIO%d\n"), gpio);
+    return false;
+}
+
+bool gpioReleaseLock(unsigned char gpio) {
+    if (gpioValid(gpio)) {
+        _gpio_locked[gpio] = false;
+        DEBUG_MSG_P(PSTR("[GPIO] GPIO%d lock released\n"), gpio);
+        return true;
+    }
+    DEBUG_MSG_P(PSTR("[GPIO] Failed releasing lock for GPIO%d\n"), gpio);
+    return false;
+}
diff --git a/code/espurna/sensors/BaseSensor.h b/code/espurna/sensors/BaseSensor.h
index b9ea6d46..e032024e 100644
--- a/code/espurna/sensors/BaseSensor.h
+++ b/code/espurna/sensors/BaseSensor.h
@@ -48,6 +48,7 @@ typedef enum magnitude_t {
 #define SENSOR_ERROR_UNKNOWN_ID     4       // Sensor did not report a known ID
 #define SENSOR_ERROR_CRC            5       // Sensor data corrupted
 #define SENSOR_ERROR_I2C            6       // Wrong or locked I2C address
+#define SENSOR_ERROR_GPIO_USED      7       // The GPIO is already in use
 
 class BaseSensor {
 
@@ -106,13 +107,6 @@ class BaseSensor {
 
     protected:
 
-        // Check if valid GPIO
-        bool _validGPIO(unsigned char gpio) {
-            if (0 <= gpio && gpio <= 5) return true;
-            if (12 <= gpio && gpio <= 15) return true;
-            return false;
-        }
-
         unsigned char _sensor_id = 0x00;
         int _error = 0;
         bool _dirty = true;
diff --git a/code/espurna/sensors/DHTSensor.h b/code/espurna/sensors/DHTSensor.h
index b2486a00..d2c7e8cd 100644
--- a/code/espurna/sensors/DHTSensor.h
+++ b/code/espurna/sensors/DHTSensor.h
@@ -30,6 +30,10 @@ class DHTSensor : public BaseSensor {
             _sensor_id = SENSOR_DHTXX_ID;
         }
 
+        ~DHTSensor() {
+            if (_previous != 0xFF) gpioReleaseLock(_previous);
+        }
+
         // ---------------------------------------------------------------------
 
         void setGPIO(unsigned char gpio) {
@@ -54,6 +58,24 @@ class DHTSensor : public BaseSensor {
         // Sensor API
         // ---------------------------------------------------------------------
 
+        // Initialization method, must be idempotent
+        void begin() {
+
+            _count = 0;
+
+            // Manage GPIO lock
+            if (_previous != 0xFF) gpioReleaseLock(_previous);
+            _previous = 0xFF;
+            if (!gpioGetLock(_gpio)) {
+                _error = SENSOR_ERROR_GPIO_USED;
+                return;
+            }
+            _previous = _gpio;
+
+            _count = 2;
+
+        }
+
         // Pre-read hook (usually to populate registers with up-to-date data)
         void pre() {
             _read();
@@ -194,6 +216,7 @@ class DHTSensor : public BaseSensor {
         }
 
         unsigned char _gpio;
+        unsigned char _previous = 0xFF;
         unsigned char _type;
 
         unsigned long _last_ok = 0;
diff --git a/code/espurna/sensors/DallasSensor.h b/code/espurna/sensors/DallasSensor.h
index 25faa50d..e01a86cf 100644
--- a/code/espurna/sensors/DallasSensor.h
+++ b/code/espurna/sensors/DallasSensor.h
@@ -39,6 +39,7 @@ class DallasSensor : public BaseSensor {
 
         ~DallasSensor() {
             if (_wire) delete _wire;
+            if (_previous != 0xFF) gpioReleaseLock(_previous);
         }
 
         // ---------------------------------------------------------------------
@@ -65,6 +66,14 @@ class DallasSensor : public BaseSensor {
             if (!_dirty) return;
             _dirty = false;
 
+            // Manage GPIO lock
+            if (_previous != 0xFF) gpioReleaseLock(_previous);
+            _previous = 0xFF;
+            if (!gpioGetLock(_gpio)) {
+                _error = SENSOR_ERROR_GPIO_USED;
+                return;
+            }
+
             // OneWire
             if (_wire) delete _wire;
             _wire = new OneWire(_gpio);
@@ -78,6 +87,13 @@ class DallasSensor : public BaseSensor {
                 loadDevices();
             }
 
+            // Check connection
+            if (_count == 0) {
+                gpioReleaseLock(_gpio);
+            } else {
+                _previous = _gpio;
+            }
+
         }
 
         // Loop-like method, call it in your main loop
@@ -281,6 +297,7 @@ class DallasSensor : public BaseSensor {
         std::vector<ds_device_t> _devices;
 
         unsigned char _gpio;
+        unsigned char _previous = 0xFF;
         OneWire * _wire = NULL;
 
 };
diff --git a/code/espurna/sensors/ECH1560Sensor.h b/code/espurna/sensors/ECH1560Sensor.h
index 63403069..cf95d550 100644
--- a/code/espurna/sensors/ECH1560Sensor.h
+++ b/code/espurna/sensors/ECH1560Sensor.h
@@ -303,7 +303,7 @@ static void (*_ech1560_sensor_isr_list[10])() = {
 };
 
 void ECH1560Sensor::_attach(ECH1560Sensor * instance, unsigned char gpio, unsigned char mode) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     _detach(gpio);
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     _ech1560_sensor_instance[index] = instance;
@@ -314,7 +314,7 @@ void ECH1560Sensor::_attach(ECH1560Sensor * instance, unsigned char gpio, unsign
 }
 
 void ECH1560Sensor::_detach(unsigned char gpio) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     if (_ech1560_sensor_instance[index]) {
         detachInterrupt(gpio);
diff --git a/code/espurna/sensors/EventSensor.h b/code/espurna/sensors/EventSensor.h
index c14f92f9..985d07e3 100644
--- a/code/espurna/sensors/EventSensor.h
+++ b/code/espurna/sensors/EventSensor.h
@@ -177,7 +177,7 @@ static void (*_event_sensor_isr_list[10])() = {
 };
 
 void EventSensor::_attach(EventSensor * instance, unsigned char gpio, unsigned char mode) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     _detach(gpio);
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     _event_sensor_instance[index] = instance;
@@ -188,7 +188,7 @@ void EventSensor::_attach(EventSensor * instance, unsigned char gpio, unsigned c
 }
 
 void EventSensor::_detach(unsigned char gpio) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     if (_event_sensor_instance[index]) {
         detachInterrupt(gpio);
diff --git a/code/espurna/sensors/HLW8012Sensor.h b/code/espurna/sensors/HLW8012Sensor.h
index 8a813b44..34729bd8 100644
--- a/code/espurna/sensors/HLW8012Sensor.h
+++ b/code/espurna/sensors/HLW8012Sensor.h
@@ -287,7 +287,7 @@ static void (*_hlw8012_sensor_isr_list[10])() = {
 };
 
 void HLW8012Sensor::_attach(HLW8012Sensor * instance, unsigned char gpio, unsigned char mode) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     _detach(gpio);
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     _hlw8012_sensor_instance[index] = instance;
@@ -298,7 +298,7 @@ void HLW8012Sensor::_attach(HLW8012Sensor * instance, unsigned char gpio, unsign
 }
 
 void HLW8012Sensor::_detach(unsigned char gpio) {
-    if (!_validGPIO(gpio)) return;
+    if (!gpioValid(gpio)) return;
     unsigned char index = gpio > 5 ? gpio-6 : gpio;
     if (_hlw8012_sensor_instance[index]) {
         detachInterrupt(gpio);