Ishraq Ibne Ashraf

NAME

Tinkerforge::BrickletDistanceIR - Measures distance up to 150cm with infrared light

CONSTANTS

DEVICE_IDENTIFIER

This constant is used to identify a Distance IR Bricklet.

The get_identity() subroutine and the CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

DEVICE_DISPLAY_NAME

This constant represents the display name of a Distance IR Bricklet.

CALLBACK_DISTANCE

This constant is used with the register_callback() subroutine to specify the CALLBACK_DISTANCE callback.

CALLBACK_ANALOG_VALUE

This constant is used with the register_callback() subroutine to specify the CALLBACK_ANALOG_VALUE callback.

CALLBACK_DISTANCE_REACHED

This constant is used with the register_callback() subroutine to specify the CALLBACK_DISTANCE_REACHED callback.

CALLBACK_ANALOG_VALUE_REACHED

This constant is used with the register_callback() subroutine to specify the CALLBACK_ANALOG_VALUE_REACHED callback.

FUNCTION_GET_DISTANCE

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_ANALOG_VALUE

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_SAMPLING_POINT

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_SAMPLING_POINT

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_DISTANCE_CALLBACK_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_DISTANCE_CALLBACK_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_ANALOG_VALUE_CALLBACK_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_ANALOG_VALUE_CALLBACK_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_DISTANCE_CALLBACK_THRESHOLD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_DISTANCE_CALLBACK_THRESHOLD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_ANALOG_VALUE_CALLBACK_THRESHOLD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_ANALOG_VALUE_CALLBACK_THRESHOLD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_SET_DEBOUNCE_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_DEBOUNCE_PERIOD

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTION_GET_IDENTITY

This constant is used with the get_response_expected(), set_response_expected() and set_response_expected_all() subroutines.

FUNCTIONS

new()

Creates an object with the unique device ID *uid* and adds it to the IP Connection *ipcon*.

get_distance()

Returns the distance measured by the sensor. The value is in mm and possible distance ranges are 40 to 300, 100 to 800 and 200 to 1500, depending on the selected IR sensor.

If you want to get the distance periodically, it is recommended to use the :cb:`Distance` callback and set the period with :func:`Set Distance Callback Period`.

get_analog_value()

Returns the value as read by a 12-bit analog-to-digital converter. The value is between 0 and 4095.

.. note:: The value returned by :func:`Get Distance` is averaged over several samples to yield less noise, while :func:`Get Analog Value` gives back raw unfiltered analog values. The only reason to use :func:`Get Analog Value` is, if you need the full resolution of the analog-to-digital converter.

If you want the analog value periodically, it is recommended to use the :cb:`Analog Value` callback and set the period with :func:`Set Analog Value Callback Period`.

set_sampling_point()

Sets a sampling point value to a specific position of the lookup table. The lookup table comprises 128 equidistant analog values with corresponding distances.

If you measure a distance of 50cm at the analog value 2048, you should call this function with (64, 5000). The utilized analog-to-digital converter has a resolution of 12 bit. With 128 sampling points on the whole range, this means that every sampling point has a size of 32 analog values. Thus the analog value 2048 has the corresponding sampling point 64 = 2048/32.

Sampling points are saved on the EEPROM of the Distance IR Bricklet and loaded again on startup.

.. note:: An easy way to calibrate the sampling points of the Distance IR Bricklet is implemented in the Brick Viewer. If you want to calibrate your Bricklet it is highly recommended to use this implementation.

get_sampling_point()

Returns the distance to a sampling point position as set by :func:`Set Sampling Point`.

set_distance_callback_period()

Sets the period in ms with which the :cb:`Distance` callback is triggered periodically. A value of 0 turns the callback off.

The :cb:`Distance` callback is only triggered if the distance has changed since the last triggering.

The default value is 0.

get_distance_callback_period()

Returns the period as set by :func:`Set Distance Callback Period`.

set_analog_value_callback_period()

Sets the period in ms with which the :cb:`Analog Value` callback is triggered periodically. A value of 0 turns the callback off.

The :cb:`Analog Value` callback is only triggered if the analog value has changed since the last triggering.

The default value is 0.

get_analog_value_callback_period()

Returns the period as set by :func:`Set Analog Value Callback Period`.

set_distance_callback_threshold()

Sets the thresholds for the :cb:`Distance Reached` callback.

The following options are possible:

.. csv-table:: :header: "Option", "Description" :widths: 10, 100

 "'x'",    "Callback is turned off"
 "'o'",    "Callback is triggered when the distance is *outside* the min and max values"
 "'i'",    "Callback is triggered when the distance is *inside* the min and max values"
 "'<'",    "Callback is triggered when the distance is smaller than the min value (max is ignored)"
 "'>'",    "Callback is triggered when the distance is greater than the min value (max is ignored)"

The default value is ('x', 0, 0).

get_distance_callback_threshold()

Returns the threshold as set by :func:`Set Distance Callback Threshold`.

set_analog_value_callback_threshold()

Sets the thresholds for the :cb:`Analog Value Reached` callback.

The following options are possible:

.. csv-table:: :header: "Option", "Description" :widths: 10, 100

 "'x'",    "Callback is turned off"
 "'o'",    "Callback is triggered when the analog value is *outside* the min and max values"
 "'i'",    "Callback is triggered when the analog value is *inside* the min and max values"
 "'<'",    "Callback is triggered when the analog value is smaller than the min value (max is ignored)"
 "'>'",    "Callback is triggered when the analog value is greater than the min value (max is ignored)"

The default value is ('x', 0, 0).

get_analog_value_callback_threshold()

Returns the threshold as set by :func:`Set Analog Value Callback Threshold`.

set_debounce_period()

Sets the period in ms with which the threshold callbacks

* :cb:`Distance Reached`, * :cb:`Analog Value Reached`

are triggered, if the thresholds

* :func:`Set Distance Callback Threshold`, * :func:`Set Analog Value Callback Threshold`

keep being reached.

The default value is 100.

get_debounce_period()

Returns the debounce period as set by :func:`Set Debounce Period`.

get_identity()

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found :ref:`here <device_identifier>`. |device_identifier_constant|