268 lines
9.7 KiB
ReStructuredText
268 lines
9.7 KiB
ReStructuredText
DFRobot mmWave Radar
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====================
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.. seo::
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:description: Instructions for setting up DFRobot mmWave Radar
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:image: dfrobot_sen0395.jpg
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:keywords: mmWave
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The `DFRobot mmWave Radar <https://wiki.dfrobot.com/mmWave_Radar_Human_Presence_Detection_SKU_SEN0395>`__
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(aka ``SEN0395``) is a 24GHz radar which can be used for human presence detection. It can detect tiny movements
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and compared to a PIR sensor **it can detect presence continuously**. This can be useful, for example, to turn
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the lights on when you enter a room, keep them on as long as you are there (without waving your hands at the
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sensor) and turn them off almost immediately after you leave the room.
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It is possible to use this sensor with only a single GPIO pin; however, if you wish to change its settings,
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a :doc:`/components/uart` component (and its requisite GPIO pins) is required in your device's configuration.
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.. figure:: images/dfrobot_sen0395-full.jpg
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:align: center
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:width: 75%
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DFRobot mmWave Radar / presence detection sensor
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.. code-block:: yaml
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# Example configuration entry
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dfrobot_sen0395:
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binary_sensor:
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# Information coming from uart bus
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- platform: dfrobot_sen0395
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name: Mmwave Detected via UART
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# Information coming from dedicated gpio (IO2)
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- platform: gpio
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name: Mmwave Detected via GPIO
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device_class: motion
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pin:
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number: REPLACEME
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mode: INPUT_PULLDOWN
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switch:
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# Switch to turn on/off detection
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- platform: dfrobot_sen0395
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name: Mmwave Active
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.. _dfrobot_sen0395-component:
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Hub Component
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-------------
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You only need to have the hub component (``dfrobot_sen0395:`` entry) defined if you want to change the sensor's
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settings or read its state via the UART. A :doc:`/components/binary_sensor/gpio` alone is sufficient if you only want
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to determine presence/occupancy. When you define ``dfrobot_sen0395:`` you'll need to have a ``uart:`` entry in
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your configuration with both the TX and RX pins defined and the baud rate must be set to ``115200``.
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Multiple instances of this component may be defined if multiple :doc:`/components/uart` components are available:
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.. code-block:: yaml
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dfrobot_sen0395:
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- id: mmWave_1
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uart_id: uart_1
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- id: mmWave_2
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uart_id: uart_2
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...
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Configuration variables:
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************************
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation. Necessary if you want
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to define multiple instances of this component.
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- **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :doc:`/components/uart` if you want
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to use multiple UART buses.
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.. _dfrobot_sen0395-binary_sensor:
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Binary Sensor
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-------------
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.. _dfrobot_sen0395-via_gpio:
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Via GPIO
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********
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To determine presence, you can simply use a :doc:`/components/binary_sensor/gpio` and connect a single GPIO pin
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from your processor to the IO2 pin of the mmWave radar. Using a dedicated GPIO pin may offer an advantage since
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it may wake the processor from sleep.
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If you don't want/need to change the radar's settings and only need to determine presence/occupancy, the
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``dfrobot_sen0395:`` and ``uart:`` components are not necessary.
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.. code-block:: yaml
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binary_sensor:
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- platform: gpio
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name: Presence Detected via GPIO
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device_class: motion
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pin:
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number: REPLACEME
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mode: INPUT_PULLDOWN
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.. _dfrobot_sen0395-via_uart:
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Via UART
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********
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Connecting the sensor via the serial connection (UART) allows both changing its settings as well as reading its state.
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Note, however, that the UART peripheral cannot wake the processor; if you plan on sleeping the processor, you'll likely
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still need to use the :ref:`GPIO pin <dfrobot_sen0395-via_gpio>` approach described above (in addition to the UART).
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First, setup a :doc:`/components/uart` and :ref:`dfrobot_sen0395-component` and then use its binary sensor platform
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to create individual binary sensors for each presence sensor.
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.. code-block:: yaml
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binary_sensor:
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- platform: dfrobot_sen0395
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name: Presence Detected via UART
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Configuration variables:
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************************
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- **dfrobot_sen0395_id** (*Optional*, :ref:`config-id`): The ID of the DFRobot mmWave component defined above.
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Required when multiple instances of the ``dfrobot_sen0395`` component are defined.
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- All other options from :ref:`Binary Sensor <config-binary_sensor>`.
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.. _dfrobot_sen0395-switch:
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Switch
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------
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:ref:`Switch components <config-switch>` are used to enable/disable various module features/functions.
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.. code-block:: yaml
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switch:
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- platform: dfrobot_sen0395
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dfrobot_sen0395_id: mmWave
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type: sensor_active
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name: mmWave Active
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Configuration variables:
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************************
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- **dfrobot_sen0395_id** (*Optional*, :ref:`config-id`): The ID of the DFRobot mmWave component defined above.
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Required when multiple instances of the ``dfrobot_sen0395`` component are defined.
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- **type** (**Required**): One of:
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- ``presence_via_uart``: when enabled, the module sends presence information via both the serial connection and
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GPIO pin; when disabled, presense is indicated only via the GPIO pin.
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- ``sensor_active``: when enabled, presence detection is reported; when disabled, presense will not be reported.
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- ``start_after_boot``: when enabled, the sensor will start immediately after power-on; when disabled, the sensor
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must be manually started.
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- ``turn_on_led``: when enabled, the mmWave sensor's LED blinks during operation; when disabled, the LED will always
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remain off.
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- All other options from :ref:`Switch <config-switch>`.
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.. _dfrobot_sen0395-actions:
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Actions
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-------
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.. _dfrobot_sen0395-action_settings:
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``dfrobot_sen0395.settings`` Action
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***********************************
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.. warning::
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Each change to the configuration of the mmWave radar triggers a write to its internal flash/EEPROM.
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Write cycles to this memory are limited, so avoid the practice of changing settings frequently.
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Determine the appropriate settings for your device and avoid changing them unless absolutely necessary.
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The DFRobot mmWave Radar has several settings which can be changed. These settings are saved in non-volatile memory
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and do not need to be set on each boot.
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The settings action allows changing of any number of the mmWave radar's internal parameters/settings. With this
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action, any unspecified parameters will remain unchanged. All settings are tempatable.
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.. code-block:: yaml
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on_...:
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- dfrobot_sen0395.settings:
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factory_reset: true
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detection_segments:
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# Define between one and four segments
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- [0cm, 3m]
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- [5.1m, 6.6m]
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output_latency:
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delay_after_detect: 0s
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delay_after_disappear: 0s
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sensitivity: 7
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Configuration variables:
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````````````````````````
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID of the mmWave sensor on which settings should be
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changed. If only one radar is defined, this is optional.
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- **factory_reset** (*Optional*, boolean): If set to true, a factory reset of the sensor will be performed (before
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changing other options if present). Ignored if not set or set to ``false``.
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- **detection_segments** (*Optional*, list): A list of detection segments. A segment specifies from where to where
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detection should trigger. One to four segments and ranges from 0cm to 9m may be specified. Distances should be
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defined in steps of 15cm. Note that the specified ranges are rounded internally. Segments can be defined in a
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one or two dimensional list. Pairs of values must be defined (from distance to distance). The default is one
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range from 0cm to 3m.
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**Examples**
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.. code-block:: yaml
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detection_segments:
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- [0cm, 3m]
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- [5.1m, 6.6m]
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In the above example, if a person was present in the range between 0cm and 3m (distance from the sensor) or
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between 5.1m and 6.6m the sensor would trigger (meaning a person was detected). If a person is present
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between 3.1m and 5m or 6.7m and 9m it would not trigger.
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.. code-block:: yaml
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detection_segments:
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- !lambda |-
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return 0;
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- !lambda |-
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return return id(mwave_max_distance).state;
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Section values can be defined using lambdas, so you can set the distances depending on other entities. Distances
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are defined as a float in meters (10cm = 0.1). If you return a negative value (-1) the segment will not be set.
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- **output_latency** (*Optional*, dictionary):
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- **delay_after_detect** (**Required**, :ref:`config-time`): Time to wait before signaling that a person was
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detected. Specify in steps of 25 ms. Factory default is 2.5s. Value is tempatable: Return seconds value
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(100 ms = 0.1). Returning -1 keeps the value unchanged.
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- **delay_after_disappear** (**Required**, :ref:`config-time`): Time to wait before signaling that a person
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is no longer detected. Specify in steps of 25 ms. Factory default is 10 s. Value is tempatable: Return seconds
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value (100 ms = 0.1). Returning -1 keeps the value unchanged.
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- **sensitivity** (*Optional*, int): Set the sensitivity of the sensor. Ranges from 0 to 9. Value is tempatable:
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Return 0-9. Returning -1 keeps the value unchanged.
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``dfrobot_sen0395.reset`` Action
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********************************
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Restart the sensor.
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.. code-block:: yaml
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on_...:
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dfrobot_sen0395.reset:
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Configuration variables:
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````````````````````````
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID of the mmWave component. Useful when multiple instances of this component are defined.
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See Also
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--------
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- :ref:`UART bus <uart>`
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- :ref:`Binary Sensor <config-binary_sensor>`
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- :ref:`config-id`
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- `DFRobot mmWave Radar Wiki page <https://wiki.dfrobot.com/mmWave_Radar_Human_Presence_Detection_SKU_SEN0395>`__
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- :ghedit:`Edit`
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