Add documentation for fs3000 sensor. (#2715)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

components/sensor/fs3000.rst

@@ -0,0 +1,47 @@
+FS3000 Air Velocity Sensor
+==========================
+
+.. seo::
+    :description: Instructions for setting up the FS3000 Air Velocity sensor.
+    :image: fs3000.jpg
+    :keywords: FS3000
+
+The FS3000 Air Velocity sensor allows you to use your FS3000
+(`datasheet <https://www.renesas.com/kr/en/document/dst/fs3000-datasheet?r=1395551>`__,
+`sparkfun <https://www.sparkfun.com/products/18377>`__)
+sensors with ESPHome.
+
+.. figure:: images/fs3000.jpg
+    :align: center
+    :width: 30.0%
+
+    FS3000 Air Velocity Sensor.
+    (Credit: `Sparkfun <https://www.sparkfun.com/products/18377>`__, image compressed)
+
+.. _Sparkfun: https://www.sparkfun.com/products/15805
+
+The FS3000 is a solid state air velocity sensor that communicates over over I²C. It is based on a MEMS thermopile sensor. There are two subtypes available: the FS3000-1005 measures air velocities between 0 meters/second and 7.23 meters/second, and the FS3000-1015 measures air velocities between 0 meters/second and 15 meters/second.
+
+To use the sensor, first set up an :ref:`I²C Bus <i2c>` and connect the sensor to the specified pins.
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    sensor:
+      - platform: fs3000
+        name: "Air Velocity"
+        model: 1005
+        update_interval: 60s
+
+Configuration variables:
+------------------------
+
+- **model** (**Required**, string): Specify FS3000 model, can be ``1005`` or ``1015``.
+- **address** (*Optional*, int): Manually specifiy the I²C address of the sensor. Defaults to ``0x28``.
+- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
+- All other options from :ref:`Sensor <config-sensor>`.
+
+See Also
+--------
+
+- :ghedit:`Edit`

index.rst

@@ -349,6 +349,7 @@ Miscellaneous
     Binary Sensor Map, components/sensor/binary_sensor_map, binary_sensor_map.jpg, Map binary to value
     b-parasite, components/sensor/b_parasite, b_parasite.jpg, Moisture & Temperature & Humidity & Light
     EZO sensor circuits, components/sensor/ezo, ezo-ph-circuit.png, (pH)
+    FS3000, components/sensor/fs3000, fs3000.jpg, Air velocity
     Havells Solar, components/sensor/havells_solar, havellsgti5000d_s.jpg, Solar rooftop
     Growatt Solar, components/sensor/growatt_solar, growatt.jpg, Solar rooftop
     Kalman Combinator, components/sensor/kalman_combinator, function.svg