Esempio n. 1
0
def s2a_fm():
    """
    This is the "main" function of the program.
    It will instantiate PyMata for communication with an Arduino micro-controller
    and the command handlers class.
    It will the start the HTTP server to communicate with Scratch 2.0
    @return : This is the main loop and should never return
    """
    # total number of pins on arduino board
    total_pins_discovered = 0
    # number of pins that are analog
    number_of_analog_pins_discovered = 0

    # make sure we have a log directory and if not, create it.
    if not os.path.exists('log'):
        os.makedirs('log')

    # turn on logging
    logging.basicConfig(filename='./log/s2a_fm_debugging.log',
                        filemode='w',
                        level=logging.DEBUG)
    logging.info(
        's2a_fm version 1.5    Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '
    )
    print 's2a est la version entierement en francais de s2a_fm, une sorte de s2a_fr v1.7'
    print 's2a_fm version 1.5   Copyright(C) 2013-14 Alan Yorinks    Tous droits reserves '

    # print 'Traductions francaises : Sebastien Canet'

    # get the com_port from the command line or default if none given
    # if user specified the com port on the command line, use that when invoking PyMata,
    # else use '/dev/ttyACM0'
    if len(sys.argv) == 2:
        com_port = str(sys.argv[1])
    else:
        com_port = '/dev/ttyACM0'
    logging.info('com port = %s' % com_port)

    try:
        # instantiate PyMata
        firmata = PyMata(com_port)  # pragma: no cover
    except Exception:
        print 'Impossible de communiquer avec PyMata - votre carte Arduino est bien connectee ??'
        logging.exception(
            'Could not instantiate PyMata - is your Arduino plugged in?')
        logging.debug("Exiting s2a_fm")
        return

    # determine the total number of pins and the number of analog pins for the Arduino
    # get the arduino analog pin map
    # it will contain an entry for all the pins with non-analog set to firmata.IGNORE
    firmata.analog_mapping_query()

    capability_map = firmata.get_analog_mapping_request_results()

    firmata.capability_query()
    print "Merci de patienter pendant la detection du nombre de pins de votre Arduino. Cela peut prendre pres de 30s de plus."

    # count the pins
    for pin in capability_map:
        total_pins_discovered += 1
        # non analog pins will be marked as IGNORE
        if pin != firmata.IGNORE:
            number_of_analog_pins_discovered += 1

    # log the number of pins found
    logging.info('%d Total Pins and %d Analog Pins Found' %
                 (total_pins_discovered, number_of_analog_pins_discovered))

    # instantiate the command handler
    scratch_command_handler = ScratchCommandHandlers(
        firmata, com_port, total_pins_discovered,
        number_of_analog_pins_discovered)

    # wait for a maximum of 30 seconds to retrieve the Arduino capability query
    start_time = time.time()

    pin_capability = firmata.get_capability_query_results()
    while not pin_capability:
        if time.time() - start_time > 30:
            print ''
            print "Impossible de determiner le nombre de pins - sortie du script."
            firmata.close()
            # keep sending out a capability query until there is a response
        pin_capability = firmata.get_capability_query_results()
        time.sleep(.1)

    # we've got the capability, now build a dictionary with pin as the key and a list of all the capabilities
    # for the pin as the key's value
    pin_list = []
    total_pins_discovered = 0
    for entry in pin_capability:
        # bump up pin counter each time IGNORE is found
        if entry == firmata.IGNORE:
            scratch_command_handler.pin_map[total_pins_discovered] = pin_list
            total_pins_discovered += 1
            pin_list = []
        else:
            pin_list.append(entry)

    print "Detection des pins de la carte Arduino faite en %d secondes" % (
        int(time.time() - start_time))

    try:
        # lance un script pour automatiser l'ouverture de Scratch pendant que le serveur se met en route
        # il est separe pour permettre aux utilisateurs de le modifier en direct, dans le batch, ca simplifie
        # os.startfile('Scratch2.bat')
        # start the server passing it the handle to PyMata and the command handler.
        scratch_http_server.start_server(firmata, scratch_command_handler)

    except Exception:
        logging.debug('Erreur dans s2a_fm.py %s' % str(Exception))
        firmata.close()
        return

    except KeyboardInterrupt:
        # give control back to the shell that started us
        logging.info('s2a_fm.py: keyboard interrupt exception')
        firmata.close()
        return
Esempio n. 2
0
def s2a_fm():

    """
    This is the "main" function of the program.
    It will instantiate PyMata for communication with an Arduino micro-controller
    and the command handlers class.
    It will the start the HTTP server to communicate with Scratch 2.0
    @return : This is the main loop and should never return
    """
    # total number of pins on arduino board
    total_pins_discovered = 0
    # number of pins that are analog
    number_of_analog_pins_discovered = 0

    # make sure we have a log directory and if not, create it.
    if not os.path.exists('log'):
        os.makedirs('log')

    # turn on logging
    logging.basicConfig(filename='./log/s2a_fm_debugging.log', filemode='w', level=logging.DEBUG)
    logging.info('s2a_fm version 1.5    Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved ')
    print 's2a_fm version 1.5   Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '

    # get the com_port from the command line or default if none given
    # if user specified the com port on the command line, use that when invoking PyMata,
    # else use '/dev/ttyACM0'
    if len(sys.argv) == 2:
        com_port = str(sys.argv[1])
    else:
        com_port = '/dev/ttyACM0'
    logging.info('com port = %s' % com_port)

    try:
        # instantiate PyMata
        firmata = PyMata(com_port)  # pragma: no cover
    except Exception:
        print 'Could not instantiate PyMata - is your Arduino plugged in?'
        logging.exception('Could not instantiate PyMata - is your Arduino plugged in?')
        logging.debug("Exiting s2a_fm")
        return

    # determine the total number of pins and the number of analog pins for the Arduino
    # get the arduino analog pin map
    # it will contain an entry for all the pins with non-analog set to firmata.IGNORE
    firmata.analog_mapping_query()

    capability_map = firmata.get_analog_mapping_request_results()

    firmata.capability_query()
    print "Please wait for Total Arduino Pin Discovery to complete. This can take up to 30 additional seconds."

    # count the pins
    for pin in capability_map:
            total_pins_discovered += 1
            # non analog pins will be marked as IGNORE
            if pin != firmata.IGNORE:
                number_of_analog_pins_discovered += 1

    # log the number of pins found
    logging.info('%d Total Pins and %d Analog Pins Found' % (total_pins_discovered, number_of_analog_pins_discovered))

    # instantiate the command handler
    scratch_command_handler = ScratchCommandHandlers(firmata, com_port, total_pins_discovered,
                                                     number_of_analog_pins_discovered)

    # wait for a maximum of 30 seconds to retrieve the Arduino capability query
    start_time = time.time()

    pin_capability = firmata.get_capability_query_results()
    while not pin_capability:
        if time.time() - start_time > 30:
            print ''
            print "Could not determine pin capability - exiting."
            firmata.close()
            # keep sending out a capability query until there is a response
        pin_capability = firmata.get_capability_query_results()
        time.sleep(.1)

    # we've got the capability, now build a dictionary with pin as the key and a list of all the capabilities
    # for the pin as the key's value
    pin_list = []
    total_pins_discovered = 0
    for entry in pin_capability:
        # bump up pin counter each time IGNORE is found
        if entry == firmata.IGNORE:
            scratch_command_handler.pin_map[total_pins_discovered] = pin_list
            total_pins_discovered += 1
            pin_list = []
        else:
            pin_list.append(entry)

    print "Arduino Total Pin Discovery completed in %d seconds" % (int(time.time() - start_time))

    try:
        # start the server passing it the handle to PyMata and the command handler.
        scratch_http_server.start_server(firmata, scratch_command_handler)

    except Exception:
        logging.debug('Exception in s2a_fm.py %s' % str(Exception))
        firmata.close()
        return

    except KeyboardInterrupt:
        # give control back to the shell that started us
        logging.info('s2a_fm.py: keyboard interrupt exception')
        firmata.close()
        return
Esempio n. 3
0
class ArduinoFirmata(Board, AnalogInputCapable, PwmOutputCapable):

    def __init__(self, port=None):
        try:
            from PyMata.pymata import PyMata as PyMata  # noqa
        except ImportError:
            msg = 'pingo.arduino.Arduino requires PyMata installed'
            raise ImportError(msg)

        super(ArduinoFirmata, self).__init__()
        self.port = port
        self.firmata_client = PyMata(self.port, verbose=VERBOSE)

        self.firmata_client.capability_query()
        time.sleep(10)  # TODO: Find a small and safe value
        capability_query_results = self.firmata_client.get_capability_query_results()
        capability_dict = pin_list_to_board_dict(capability_query_results)

        self._add_pins(
            [DigitalPin(self, location)
                for location in capability_dict['digital']] +
            [PwmPin(self, location)
                for location in capability_dict['pwm']] +
            [AnalogPin(self, 'A%s' % location, resolution=10)
                for location in capability_dict['analog']]
        )

    def cleanup(self):
        # self.firmata_client.close() has sys.exit(0)
        if hasattr(self, 'PyMata'):
            try:
                self.firmata_client.transport.close()
            except AttributeError:
                pass

    def __repr__(self):
        cls_name = self.__class__.__name__
        return '<{cls_name} {self.port!r}>'.format(**locals())

    def _set_digital_mode(self, pin, mode):
        self.firmata_client.set_pin_mode(
            pin.location,
            PIN_MODES[mode],
            self.firmata_client.DIGITAL
        )

    def _set_analog_mode(self, pin, mode):
        pin_id = int(pin.location[1:])
        self.firmata_client.set_pin_mode(
            pin_id,
            self.firmata_client.INPUT,
            self.firmata_client.ANALOG
        )

    def _set_pwm_mode(self, pin, mode):
        pin_id = int(pin.location)
        self.firmata_client.set_pin_mode(
            pin_id,
            self.firmata_client.PWM,
            self.firmata_client.DIGITAL
        )

    def _get_pin_state(self, pin):
        _state = self.firmata_client.digital_read(pin.location)
        if _state == self.firmata_client.HIGH:
            return pingo.HIGH
        return pingo.LOW

    def _set_pin_state(self, pin, state):
        self.firmata_client.digital_write(
            pin.location,
            PIN_STATES[state]
        )

    def _get_pin_value(self, pin):
        pin_id = int(pin.location[1:])
        return self.firmata_client.analog_read(pin_id)

    def _set_pwm_duty_cycle(self, pin, value):
        pin_id = int(pin.location)
        firmata_value = int(value * 255)
        return self.firmata_client.analog_write(pin_id, firmata_value)

    def _set_pwm_frequency(self, pin, value):
        raise NotImplementedError
Esempio n. 4
0
def signal_handler(sig, frame):
    print('You pressed Ctrl+C')
    if board is not None:
        board.reset()
    sys.exit(0)


signal.signal(signal.SIGINT, signal_handler)

# Create a PyMata instance
board = PyMata("/dev/ttyACM0")

# Set the pin mode
board.servo_config(5)
board.set_pin_mode(12, board.OUTPUT, board.DIGITAL)
board.set_pin_mode(0, board.INPUT, board.ANALOG)

# Send query request to Arduino
board.capability_query()

# Some boards take a long time to respond - adjust as needed
time.sleep(5)
print("Pin Capability Report")
print(board.get_capability_query_results())

print("PyMata Digital Response Table")
print(board.get_digital_response_table())

print("PyMata Analog Response Table")
print(board.get_analog_response_table())
Esempio n. 5
0
def s2a_fm():
    """
    This is the "main" function of the program.
    It will instantiate PyMata for communication with an Arduino micro-controller
    and the command handlers class.
    It will the start the HTTP server to communicate with Scratch 2.0
    @return : This is the main loop and should never return
    """
    global s2a_fm_status

    # total number of pins on arduino board
    total_pins_discovered = 0
    # number of pins that are analog
    number_of_analog_pins_discovered = 0
    # Ethernet/WiFi autodetect
    autodetect = 0

    print 's2a_fm version 1.5   Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '

    # get the com_port from the command line or default if none given
    # if user specified the com port on the command line, use that when invoking PyMata,
    # else use '/dev/ttyACM0'

    projectName = '86Hexapodtest'
    com_port = '/dev/ttyACM0'
    ui_server_port = 8386

    if len(sys.argv) == 2:
        if str(sys.argv[1]) == 'autodetect':
            autodetect = 1
        else:
            com_port = str(sys.argv[1])

    elif len(sys.argv) == 3:
        if str(sys.argv[1]).find('com') == 0:
            com_port = str(sys.argv[1])
            ui_server_port = int(sys.argv[2])
        elif str(sys.argv[1]) == 'autodetect':
            autodetect = 1
            ui_server_port = int(sys.argv[2])
        else:
            host_ip = str(sys.argv[1])
            host_port = int(sys.argv[2])

    elif len(sys.argv) == 4:
        host_ip = str(sys.argv[1])
        host_port = int(sys.argv[2])
        ui_server_port = int(sys.argv[3])

    try:
        # instantiate PyMata
        if autodetect == 1:
            firmata = PyMata(host_port=2000,
                             ui_server_port=ui_server_port,
                             projectName=projectName,
                             autodetect=autodetect)
        elif str(sys.argv[1]).find('com') == 0:
            firmata = PyMata(port_id=com_port,
                             ui_server_port=ui_server_port)  # pragma: no cover
        elif len(sys.argv) == 3 or len(sys.argv) == 4:
            firmata = PyMata(host_ip=host_ip,
                             host_port=host_port,
                             ui_server_port=ui_server_port)  # pragma: no cover
    except Exception:
        print 'Could not instantiate PyMata - is your Arduino plugged in?'
        return

    firmata.set_s2a_fm_status(5)

    # determine the total number of pins and the number of analog pins for the Arduino
    # get the arduino analog pin map
    # it will contain an entry for all the pins with non-analog set to firmata.IGNORE
    # firmata.analog_mapping_query()
    # time.sleep(.1)
    capability_map = firmata.get_analog_mapping_request_results()

    firmata.capability_query()
    print "Please wait for Total Arduino Pin Discovery to complete. This can take up to 30 additional seconds."

    # count the pins
    for pin in capability_map:
        total_pins_discovered += 1
        # non analog pins will be marked as IGNORE
        if pin != firmata.IGNORE:
            number_of_analog_pins_discovered += 1

    # instantiate the command handler
    scratch_command_handler = ScratchCommandHandlers(
        firmata, com_port, total_pins_discovered,
        number_of_analog_pins_discovered)

    firmata.set_s2a_fm_status(6)

    # wait for a maximum of 30 seconds to retrieve the Arduino capability query
    start_time = time.time()

    pin_capability = firmata.get_capability_query_results()
    while not pin_capability:
        firmata.set_s2a_fm_status(7)
        if time.time() - start_time > 30:
            firmata.set_s2a_fm_status(99)
            firmata.set_error_no(4)
            print ''
            print "Could not determine pin capability - exiting."
            firmata.send_error_message()
            firmata.close(True)
            return
            # keep sending out a capability query until there is a response
        pin_capability = firmata.get_capability_query_results()
        time.sleep(.1)

    firmata.set_s2a_fm_status(8)

    # we've got the capability, now build a dictionary with pin as the key and a list of all the capabilities
    # for the pin as the key's value
    pin_list = []
    total_pins_discovered = 0
    for entry in pin_capability:
        # bump up pin counter each time IGNORE is found
        if entry == firmata.IGNORE:
            scratch_command_handler.pin_map[total_pins_discovered] = pin_list
            total_pins_discovered += 1
            pin_list = []
        else:
            pin_list.append(entry)

    print "Arduino Total Pin Discovery completed in %d seconds" % (
        int(time.time() - start_time))

    firmata.set_s2a_fm_status(9)

    thread.start_new_thread(firmata.send_command_check_active, (firmata, ))

    try:
        # start the server passing it the handle to PyMata and the command handler.
        scratch_http_server.start_server(firmata, scratch_command_handler)
    except Exception:
        firmata.set_error_no(5)
        firmata.send_error_message()
        firmata.close(True)
        return

    except KeyboardInterrupt:
        # give control back to the shell that started us
        firmata.set_error_no(99)
        firmata.close(True)
        return
Esempio n. 6
0
def signal_handler(sig, frame):
    print('You pressed Ctrl+C')
    if board is not None:
        board.reset()
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)

# Create a PyMata instance
board = PyMata("/dev/ttyACM0")

# Set the pin mode
board.servo_config(5)
board.set_pin_mode(12, board.OUTPUT, board.DIGITAL)
board.set_pin_mode(0, board.INPUT, board.ANALOG)

# Send query request to Arduino
board.capability_query()

# Some boards take a long time to respond - adjust as needed
time.sleep(5)
print("Pin Capability Report")
print(board.get_capability_query_results())

print("PyMata Digital Response Table")
print(board.get_digital_response_table())

print("PyMata Analog Response Table")
print(board.get_analog_response_table())

Esempio n. 7
0
class ArduinoFirmata(Board, AnalogInputCapable, PwmOutputCapable):
    def __init__(self, port=None):
        try:
            from PyMata.pymata import PyMata as PyMata  # noqa
        except ImportError:
            msg = 'pingo.arduino.Arduino requires PyMata installed'
            raise ImportError(msg)

        super(ArduinoFirmata, self).__init__()
        self.port = port
        self.firmata_client = PyMata(self.port, verbose=VERBOSE)

        self.firmata_client.capability_query()
        time.sleep(10)  # TODO: Find a small and safe value
        capability_query_results = self.firmata_client.get_capability_query_results(
        )
        capability_dict = pin_list_to_board_dict(capability_query_results)

        self._add_pins([
            DigitalPin(self, location)
            for location in capability_dict['digital']
        ] + [PwmPin(self, location) for location in capability_dict['pwm']] + [
            AnalogPin(self, 'A%s' % location, resolution=10)
            for location in capability_dict['analog']
        ])

    def cleanup(self):
        # self.firmata_client.close() has sys.exit(0)
        if hasattr(self, 'PyMata'):
            try:
                self.firmata_client.transport.close()
            except AttributeError:
                pass

    def __repr__(self):
        cls_name = self.__class__.__name__
        return '<{cls_name} {self.port!r}>'.format(**locals())

    def _set_digital_mode(self, pin, mode):
        self.firmata_client.set_pin_mode(pin.location, PIN_MODES[mode],
                                         self.firmata_client.DIGITAL)

    def _set_analog_mode(self, pin, mode):
        pin_id = int(pin.location[1:])
        self.firmata_client.set_pin_mode(pin_id, self.firmata_client.INPUT,
                                         self.firmata_client.ANALOG)

    def _set_pwm_mode(self, pin, mode):
        pin_id = int(pin.location)
        self.firmata_client.set_pin_mode(pin_id, self.firmata_client.PWM,
                                         self.firmata_client.DIGITAL)

    def _get_pin_state(self, pin):
        _state = self.firmata_client.digital_read(pin.location)
        if _state == self.firmata_client.HIGH:
            return pingo.HIGH
        return pingo.LOW

    def _set_pin_state(self, pin, state):
        self.firmata_client.digital_write(pin.location, PIN_STATES[state])

    def _get_pin_value(self, pin):
        pin_id = int(pin.location[1:])
        return self.firmata_client.analog_read(pin_id)

    def _set_pwm_duty_cycle(self, pin, value):
        pin_id = int(pin.location)
        firmata_value = int(value * 255)
        return self.firmata_client.analog_write(pin_id, firmata_value)

    def _set_pwm_frequency(self, pin, value):
        raise NotImplementedError
Esempio n. 8
0
def s2a_fm():
    """
    This is the "main" function of the program.
    It will instantiate PyMata for communication with an Arduino micro-controller
    and the command handlers class.
    It will the start the HTTP server to communicate with Scratch 2.0
    @return : This is the main loop and should never return
    """
    # total number of pins on arduino board
    total_pins_discovered = 0
    # number of pins that are analog
    number_of_analog_pins_discovered = 0

    # make sure we have a log directory and if not, create it.
    if not os.path.exists('log'):
        os.makedirs('log')

    # turn on logging
    logging.basicConfig(filename='./log/s2a_fm_debugging.log',
                        filemode='w',
                        level=logging.DEBUG)
    logging.info(
        's2a_fm version 1.5    Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '
    )
    print 's2a_fm version 1.5   Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '

    # get the com_port from the command line or default if none given
    # if user specified the com port on the command line, use that when invoking PyMata,
    # else use '/dev/ttyACM0'
    if len(sys.argv) == 2:
        com_port = str(sys.argv[1])
    else:
        com_port = '/dev/ttyACM0'
    logging.info('com port = %s' % com_port)

    try:
        # instantiate PyMata
        firmata = PyMata(com_port)  # pragma: no cover
    except Exception:
        print 'Could not instantiate PyMata - is your Arduino plugged in?'
        logging.exception(
            'Could not instantiate PyMata - is your Arduino plugged in?')
        logging.debug("Exiting s2a_fm")
        return

    # determine the total number of pins and the number of analog pins for the Arduino
    # get the arduino analog pin map
    # it will contain an entry for all the pins with non-analog set to firmata.IGNORE
    firmata.analog_mapping_query()

    capability_map = firmata.get_analog_mapping_request_results()

    firmata.capability_query()
    print "Please wait for Total Arduino Pin Discovery to complete. This can take up to 30 additional seconds."

    # count the pins
    for pin in capability_map:
        total_pins_discovered += 1
        # non analog pins will be marked as IGNORE
        if pin != firmata.IGNORE:
            number_of_analog_pins_discovered += 1

    # log the number of pins found
    logging.info('%d Total Pins and %d Analog Pins Found' %
                 (total_pins_discovered, number_of_analog_pins_discovered))

    # instantiate the command handler
    scratch_command_handler = ScratchCommandHandlers(
        firmata, com_port, total_pins_discovered,
        number_of_analog_pins_discovered)

    # wait for a maximum of 30 seconds to retrieve the Arduino capability query
    start_time = time.time()

    pin_capability = firmata.get_capability_query_results()
    while not pin_capability:
        if time.time() - start_time > 30:
            print ''
            print "Could not determine pin capability - exiting."
            firmata.close()
            # keep sending out a capability query until there is a response
        pin_capability = firmata.get_capability_query_results()
        time.sleep(.1)

    # we've got the capability, now build a dictionary with pin as the key and a list of all the capabilities
    # for the pin as the key's value
    pin_list = []
    total_pins_discovered = 0
    for entry in pin_capability:
        # bump up pin counter each time IGNORE is found
        if entry == firmata.IGNORE:
            scratch_command_handler.pin_map[total_pins_discovered] = pin_list
            total_pins_discovered += 1
            pin_list = []
        else:
            pin_list.append(entry)

    print "Arduino Total Pin Discovery completed in %d seconds" % (
        int(time.time() - start_time))

    try:
        # start the server passing it the handle to PyMata and the command handler.
        scratch_http_server.start_server(firmata, scratch_command_handler)

    except Exception:
        logging.debug('Exception in s2a_fm.py %s' % str(Exception))
        firmata.close()
        return

    except KeyboardInterrupt:
        # give control back to the shell that started us
        logging.info('s2a_fm.py: keyboard interrupt exception')
        firmata.close()
        return
Esempio n. 9
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class s2a_fm:

    """
    This is the "main" function of the program.
    It will instantiate PyMata for communication with an Arduino micro-controller
    and the command handlers class.
    It will the start the HTTP server to communicate with Scratch 2.0
    @return : This is the main loop and should never return
    """
    def __init__(self):
        subprocess.Popen("scratch2")
        # total number of pins on arduino board
        self.total_pins_discovered = 0
        # number of pins that are analog
        self.number_of_analog_pins_discovered = 0
        # COM-Port
        self.com_port = "COM1"
        #firmata
        #self.firmata ="-

        # make sure we have a log directory and if not, create it.
        if not os.path.exists('log'):
            os.makedirs('log')

        # turn on logging
        logging.basicConfig(filename='./log/s2a_fm_debugging.log', filemode='w', level=logging.DEBUG)
        logging.info('s2a_fm version 1.5    Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved ')
        print 's2a_fm version 1.5   Copyright(C) 2013-14 Alan Yorinks    All Rights Reserved '

        # get the com_port from the command line or default if none given
        # if user specified the com port on the command line, use that when invoking PyMata,
        # else use '/dev/ttyACM0'
    

    def search_port(self):
        #returns all serial COM-Ports
        possible_ports = serial_ports() 
        print 
        for com_port in possible_ports:
            logging.info('com port = %s' % com_port)
            try:
                # instantiate PyMata
                self.firmata = PyMata(com_port)  # pragma: no cover
                self.com_port = com_port
                return 1
            except Exception:
                print('Could not instantiate PyMata - is your Arduino plugged in?')
                logging.exception('Could not instantiate PyMata on Port %s' % com_port)
        return 0
        #TODO: Ask if User Wants to flash Arduino on this Port
            
        
    def discover_arduino(self):
        # determine the total number of pins and the number of analog pins for the Arduino
        # get the arduino analog pin map
        # it will contain an entry for all the pins with non-analog set to self.firmata.IGNORE
        self.firmata.analog_mapping_query()

        self.capability_map = self.firmata.get_analog_mapping_request_results()

        self.firmata.capability_query()
        print("Please wait for Total Arduino Pin Discovery to complete. This can take up to 30 additional seconds.")

        # count the pins
        for pin in self.capability_map:
                self.total_pins_discovered += 1
                # non analog pins will be marked as IGNORE
                if pin != self.firmata.IGNORE:
                    self.number_of_analog_pins_discovered += 1

        # log the number of pins found
        logging.info('%d Total Pins and %d Analog Pins Found' % (self.total_pins_discovered, self.number_of_analog_pins_discovered))

        # instantiate the command handler
        self.scratch_command_handler = ScratchCommandHandlers(self.firmata, self.com_port, self.total_pins_discovered,
                                                         self.number_of_analog_pins_discovered)

        # wait for a maximum of 30 seconds to retrieve the Arduino capability query
        start_time = time.time()

        pin_capability = self.firmata.get_capability_query_results()
        while not pin_capability:
            if time.time() - start_time > 30:
                print "Could not determine pin capability - exiting."
                self.firmata.close()
                # keep sending out a capability query until there is a response
            pin_capability = self.firmata.get_capability_query_results()
            time.sleep(.1)

        # we've got the capability, now build a dictionary with pin as the key and a list of all the capabilities
        # for the pin as the key's value
        pin_list = []
        total_pins_discovered = 0
        for entry in pin_capability:
            # bump up pin counter each time IGNORE is found
            if entry == self.firmata.IGNORE:
                self.scratch_command_handler.pin_map[total_pins_discovered] = pin_list
                total_pins_discovered += 1
                pin_list = []
            else:
                pin_list.append(entry)

        print "Arduino Total Pin Discovery completed in %d seconds" % (int(time.time() - start_time))
    def guess_path(self):
        os_name = sys.plattform
        if os_name == "linux2":
            return  "scratch2"
        elif os_name == "win32" or os_name == "cygwin":
            #try some
            if os.path.exists("C:\Program Files (x86)\Scratch 2\Scratch 2.exe"):
                return "C:\Program Files (x86)\Scratch 2\Scratch 2.exe"
        elif os_name == "darwin":
            return "scratch2"
        return -1

    def start_server(self):
        try:
            # start the server passing it the handle to PyMata and the command handler.
            scratch_http_server.start_server(self.firmata, self.scratch_command_handler)

        except Exception:
            logging.debug('Exception in s2a_fm.py %s' % str(Exception))
            self.firmata.close()
            return

        except KeyboardInterrupt:
            # give control back to the shell that started us
            logging.info('s2a_fm.py: keyboard interrupt exception')
            self.firmata.close()
            return