diff --git a/src/guitastro/__init__.py b/src/guitastro/__init__.py
index 585812f..33778d7 100644
--- a/src/guitastro/__init__.py
+++ b/src/guitastro/__init__.py
@@ -140,6 +140,11 @@ guitastro.component_mount_pointing
 .. automodule:: guitastro.component_mount_pointing
    :members:
 
+guitastro.component_sensor_detector
+------------------------------------
+.. automodule:: guitastro.component_sensor_detector
+   :members:
+
 guitastro.device
 -------------------
 .. automodule:: guitastro.device
diff --git a/src/guitastro/component_sensor_detector.py b/src/guitastro/component_sensor_detector.py
new file mode 100644
index 0000000..80eca7d
--- /dev/null
+++ b/src/guitastro/component_sensor_detector.py
@@ -0,0 +1,273 @@
+try:
+    from .siteobs import Siteobs
+except:
+    from siteobs import Siteobs
+
+try:
+    from .ima import Ima
+except:
+    from ima import Ima
+
+try:
+    from .etc import ExposureTimeCalculator
+except:
+    from etc import ExposureTimeCalculator
+
+try:
+    from .component import Component, ComponentException
+except:
+    from component import Component, ComponentException
+
+try:
+    from .guitastrotools import GuitastroException, GuitastroTools
+except:
+    from guitastrotools import GuitastroException, GuitastroTools
+
+# #####################################################################
+# #####################################################################
+# #####################################################################
+# Class Component Sensor Detector
+# #####################################################################
+# #####################################################################
+# #####################################################################
+
+class ComponentSensorDetectorException(GuitastroException):
+
+    ERR_DETECTOR_IS_EXPOSING = 1
+    ERR_DETECTOR_IS_READING = 2
+
+    errors = [""]*3
+    errors[ERR_DETECTOR_IS_EXPOSING] = "The detector is in exposure. Cannot start other exposures"
+    errors[ERR_DETECTOR_IS_READING] = "The detector is reading. Cannot start other exposures"
+
+
+class ComponentSensorDetector(ComponentSensorDetectorException, Component, GuitastroTools):
+    """Component for Sensor detector
+
+    Implement only simulation operations.
+
+    Usage : ComponentSensorDetector()
+    """
+
+    # --- same as sensoraxis.py
+    SENSOR_STATE_UNKNOWN = -1
+    SENSOR_STATE_STOPED = 0
+    SENSOR_STATE_IDLE = 1
+    SENSOR_STATE_EXPOSING = 2
+    SENSOR_STATE_READING = 3
+
+    # =====================================================================
+    # methods
+    # =====================================================================
+
+    # ------------ init
+
+    def _my_init_params(self, param_optionals: dict, sensor_types: dict):
+        # --- This method could be overriden
+        return param_optionals, sensor_types
+
+    def init(self, *args, **kwargs):
+        """
+        Conversion from Uniform Python object into protocol language
+        Usage : ComponentSensorDetector("HADEC", name="Test")
+        """
+        # === Parameters of the command line
+        # --- Dico of optional parameters for all axis_types
+        param_optionals = {}
+        param_optionals["MODEL"] = (str, "")
+        param_optionals["MANUFACTURER"] = (str, "")
+        param_optionals["SERIAL_NUMBER"] = (str, "")
+        param_optionals["REAL"] = (bool, False)
+        param_optionals["DESCRIPTION"] = (str, "No description.")
+        param_optionals["SITE"] = (Siteobs,"GPS 0 E 45 100")
+        param_optionals["LOGO_FILE"] = (str,"")
+        param_optionals["ETC"] = (ExposureTimeCalculator, None)
+        # --- Dico of axis_types and their parameters
+        sensor_types = {}
+        sensor_types["CCD"]= {"MANDATORY" : {"NAME":[str,"Unknown"]}, "OPTIONAL" : {"LABEL":[str,"CCD Sensor"]} }
+        sensor_types["CMOS"]= {"MANDATORY" : {"NAME":[str,"Unknown"]}, "OPTIONAL" : {"LABEL":[str,"CMOS Sensor"]} }
+        # --- Add params and types when inherited
+        param_optionals, sensor_types = self._my_init_params(param_optionals, sensor_types)
+        # --- Decode args and kwargs parameters
+        self._sensor_params = self.decode_args_kwargs(0, sensor_types, param_optionals, *args, **kwargs)
+        self._sensor_type = self._sensor_params["SELECTED_ARG"]
+        # === Observatory location for ephemeris
+        if str(type(self._sensor_params["SITE"])) == "<class 'siteobs.Siteobs'>":
+            self.siteobs = self._sensor_params["SITE"]
+        else:
+            self.siteobs = Siteobs(self._sensor_params["SITE"])
+        # === Image in memory
+        self.ima = Ima()
+        self.ima.longitude(self.siteobs.longitude)
+        if str(type(self._sensor_params["ETC"])) == "<class 'etc.ExposureTimeCalculator'>":
+            self.ima.etc = self._sensor_params["ETC"]
+        # === Name
+        self.name = self._sensor_params["NAME"]
+        # === Initial state real or simulation
+        real = self._sensor_params["REAL"]
+        # === Call init1 (inherited from Component. Will be overriden by a concrete method)
+        self._my_init1(*args, **kwargs)
+        # === Initialisation of axis list according the sensor_type
+        # === Default axes setup
+        # === Call init2 (inherited from Component. Will be overriden by a concrete method)
+        self._my_init2(*args, **kwargs)
+        # ===  Default database
+        param = {}
+        param['exptime'] = 0.1
+        param['binning'] = [1, 1]
+        self._queue.put(param)
+
+    # ------------ prop
+
+    def prop(self):
+        """Component property minimal concrete method
+
+        Extended properties will be added in the method _my_prop.
+        """
+        prop = {}
+        prop['category'] = 'SensorDetector'
+        prop['actions'] = ['GET', 'SET', 'DO']
+        prop['DO'] = {}
+        prop['DO']['NATIVE'] = "The message is sent to the device with no transformation"
+        prop['DO']['ACQ'] = {}
+        prop['DO']['ACQ']['START'] = "Start a new image acquisition"
+        prop['DO']['ACQ']['STOP'] = "Stop the current sensor image with a readout"
+        prop['DO']['ACQ']['CANCEL'] = "Cancel the current sensor image without readout"
+        prop = self._my_prop(prop)
+        return prop
+
+    # ------------ do
+
+    def _do_stop(self, *args, **kwargs):
+        operation = args[0].upper()
+        # --- make the simulation
+        self.log = f"stop simulation of {operation}"
+        self.database.query("motion_simu", self.SENSOR_STATE_STOPED)
+        # --- call the real
+        if self.real:
+            self._my_do_stop(*args, **kwargs)
+
+    def _do(self, *args, **kwargs):
+        """Do an action of the component.
+        Args:
+
+            *args: List of operations extracted from split of the command:
+
+                * args[0]: main operation
+                * args[1]: sub operation
+
+        Returns:
+
+            Result depending the operation.
+        """
+        result = None
+        self._verify_nargs(1, *args)
+        operation = args[0].upper()
+        operations = list(self.prop()['DO'].keys())
+        if operation not in operations:
+            msg = f"{operation} not found amongst {operations}"
+            raise ComponentException(ComponentException.ERR_OPERATION_NOT_FOUND, msg)
+        # ---
+        kwargs['operation'] = operation
+        if operation == "START":
+            # For real and simu
+            result = self._do_start(*args, **kwargs)
+        elif operation == "STOP":
+            # For real and simu
+            result = self._do_stop(*args, **kwargs)
+        # --- only call the real method
+        self.log = f"start operation {operation}"
+        if self.real:
+            result = self._my_do(*args, **kwargs)
+        return self._fresult(result)
+
+    def _my_do(self, *args, **kwargs):
+        value = None
+        return value
+
+    # ------------ set
+
+    def _my_set(self, *args, **kwargs):
+        return args, kwargs
+
+    # ------------ get
+
+    def _my_get_final(self, *args, **kwargs):
+        # This method should be overriden
+        pass
+
+    def _my_get(self, *args, **kwargs):
+        self._my_get_final(*args, **kwargs)
+        return None
+
+    # =====================================================================
+    # =====================================================================
+    # Ima methods
+    # =====================================================================
+    # =====================================================================
+
+    # ------------ conversion int -> string for human output
+
+    def status2string(self, status:int, verb:bool= False):
+        if status == self.SENSOR_STATE_STOPED:
+            msg = "stoped" if verb else "stop"
+        elif status == self.SENSOR_STATE_IDLE:
+            msg = "idle" if verb else "idle"
+        elif status == self.SENSOR_STATE_EXPOSING:
+            msg = "exposing" if verb else "expose"
+        elif status == self.SENSOR_STATE_READING:
+            msg = "reading" if verb else "read"
+        else:
+            msg = "unknown" if verb else "unk"
+        return msg
+
+
+
+# #####################################################################
+# #####################################################################
+# #####################################################################
+# Main
+# #####################################################################
+# #####################################################################
+# #####################################################################
+
+if __name__ == "__main__":
+
+    default = 0
+    example = input(f"Select the example (0 to 0) ({default}) ")
+    try:
+        example = int(example)
+    except:
+        example = default
+
+    print("Example       = {}".format(example))
+
+    import time
+    if example == 0:
+        """
+        Simple camera simulator
+        """
+        # --- siteobs
+        siteobs = Siteobs("GPS 0 E 49 200")
+        # --- horizon
+        siteobs.horizon_altaz = [(0,40), (180,0), (360,40)]
+        # --- Image simulator
+        etc = ExposureTimeCalculator()
+        etc.camera("Audine Kaf401ME")
+        etc.optics("Takahashi_180ED")
+        # --- Component init
+        comp = ComponentSensorDetector("CCD", name="test", site=siteobs, etc=etc)
+        comp.verbose = 1
+        comp.command("SET", "exptime", 1.0)
+        comp.command("SET", "binning", [1, 1])
+        # --- Start the ACQ
+        comp.command("DO", "ACQ", "START")
+        k = 0
+        while k<3:
+            # --- Get the current coordinates
+            status = comp.command("GET", "status")
+            print(f"{k:2d} status = {status} {comp.status2string(status)}")
+            time.sleep(2)
+            k += 1
+
+
diff --git a/src/guitastro/filenames.py b/src/guitastro/filenames.py
index 6b79e56..80c6c39 100644
--- a/src/guitastro/filenames.py
+++ b/src/guitastro/filenames.py
@@ -3315,3 +3315,42 @@ if __name__ == "__main__":
         in_fullname = "/home/myuser/messier63.fits.gz"
         out_fullname = fn.join(in_fullname)
         print(out_fullname)
+
+    if example == 16:
+        """
+        Create many contexts
+        """
+        contexts = []
+        contexts.append({'context':"sequences", 'description':"Sequence files (.p, .f)", 'rootdir':"/tmp/pyros/sequences", 'pathnaming':"PyROS.seq.1"})
+        contexts.append({'context':"img/darks/L0", 'description':"Dark images L0 (individuals)", 'rootdir':"/tmp/pyros/img/darks/l0", 'pathnaming':"PyROS.img.1", 'extension':".fit"})
+        contexts.append({'context':"img/darks/L1", 'description':"Dark images L1 (stacks)", 'rootdir':"/tmp/pyros/img/darks/l1", 'pathnaming':"PyROS.img.1", 'extension':".fit"})
+
+        fn = FileNames()
+
+        for context in fn.fcontexts:
+            fn.fcontext = context # select the context
+            if fn.fcontext == "default":
+                continue
+            del fn.fcontext
+
+        for context in contexts:
+
+            fn.fcontext_create(context['context'], context['description'])
+            fn.fcontext = context['context'] # select the context
+            if context.get('rootdir') != None:
+                fn.rootdir = context.get('rootdir')
+            if context.get('naming') != None:
+                fn.naming = context.get('naming')
+            if context.get('pathing') != None:
+                fn.pathing = context.get('pathing')
+            if context.get('pathnaming') != None:
+                fn.pathnaming = context.get('pathnaming')
+            if context.get('extension') != None:
+                fn.extension = context.get('extension')
+
+        for context in fn.fcontexts:
+            fn.fcontext = context # select the context
+            if fn.fcontext == "default":
+                continue
+            print(f"{fn.fcontext} : {fn.fcontext_value('description')}")
+
diff --git a/src/guitastro/guitastrotools.py b/src/guitastro/guitastrotools.py
index 99c23c0..614e63b 100644
--- a/src/guitastro/guitastrotools.py
+++ b/src/guitastro/guitastrotools.py
@@ -650,6 +650,6 @@ if __name__ == "__main__":
         Create initial source code of a component file.
         """
         gta1 = GuitastroDev()
-        res = gta1.create_component("DetectorFocuser", "MountyPointing")
+        res = gta1.create_component("MountPointing", "SensorDetector")
         print(f"res={res}")
 
--
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