Update README.md

Cleanup for dfrobot_c4001 component section.

Author: mikelawrence

README.md

@@ -182,21 +182,26 @@ Using the STUSB4500 ESPHome component requires the following steps:
 
 ## ESPHome C4001 External Component
 
-The DFRobot C4001 (DFROBOT_C4001 or SEN0610) is a millimeter-wave presence detector. The C4001 millimeter-wave presence sensor has the advantage of being able to detect both static and moving objects. It also has a relatively strong anti-interference ability, making it less susceptible to factors such as temperature changes, variations in ambient light, and environmental noise. Whether a person is sitting, sleeping, or in motion, the sensor can quickly detect their presence.
+The DFRobot C4001 (SEN0609 or SEN0610) is a millimeter-wave presence detector. The C4001 millimeter-wave presence sensor has the advantage of being able to detect both static and moving objects. It also has a relatively strong anti-interference ability, making it less susceptible to factors such as temperature changes, variations in ambient light, and environmental noise. Whether a person is sitting, sleeping, or in motion, the sensor can quickly detect their presence.
+
+<p align="center">
+    <img src="https://dfimg.dfrobot.com/enshop/SEN0609/SEN0609_Main_01.jpg" width="50%"><br />
+    C4001 (SEN0609) 25m mmWave Presence Sensor
+</p>
 
 There are two variants:
 
-+ DFROBOT_C4001 has a 100° horizontal and 40° vertical field of view, 16 meter presence detection range and 25 meter motion detection range.
++ SEN0609 has a 100° horizontal and 40° vertical field of view, 16 meter presence detection range and 25 meter motion detection range.
 + SEN0610 has a 100° horizontal and 80° vertical field of view, 8 meter presence detection range and 12 meter motion detection range.
 
-<p align="center">
-    <img src="https://www.dfrobot.com/product-2793.html" width="30%"><br />
-    C4001 25m mmWave Presence Sensor
-</p>
+> [!NOTE]
+> Some settings have different ranges depending on the variant used. This component treats both variants the same, so it is your responsibility to make sure your configuration sets these values appropriately.
+
+The sensor can operate in one of two modes, ```Presence``` and ```Speed and Distance```. In ```Presence``` mode the sensor provides a singular occupancy output. The presence output once presence is detected will stay on for a period that can be configured. In ```Speed and Distance``` mode the occupancy binary sensor indicates if a target is being tracked or not. Each time the sensor indicates presence it also outputs target distance, target speed and target energy. In ```Speed and Distance``` mode all of these parameter update frequently. There are only two settings for this mode, micro_motion_enable switch and threshold_factor number.
 
-The sensor can operate in one of two modes, ```Presence``` and ```Speed and Distance```. In ```Presence``` mode the sensor provides a singular occupancy output. The presence output once presence is detection with stay on for longer period which can be configured. In ```Speed and Distance``` is quick to output the presence of a target and almost as quickly to indicate a clear status. Each time the sensor indicates presence it also outputs distance, speed and energy. All of these parameter update frequently.
+The C4001 sensor maintains settings in flash. When powered on these settings are loaded from flash and made operational. To change the configuration of the sensor dial in the setting you need and hit the config_save button. This will tell the sensor to store the new settings in flash and make them operational. You only need to do this once.
 
-More information on the C4001(SEN0609) sensor is available [here](https://www.dfrobot.com/product-2793.html). Information on the C4001(SEN0610) sensor is available [here](https://www.dfrobot.com/product-2795.html).
+More information on the C4001 (SEN0609) sensor is available [here](https://www.dfrobot.com/product-2793.html). Information on the C4001 (SEN0610) sensor is available [here](https://www.dfrobot.com/product-2795.html).
 
 ```yaml
 # Sample configuration entry example
@@ -262,17 +267,17 @@ switch:
 + **min_range** (*Optional*): This is the minimum detection range. Default is 0.6 meters (m) with a range of 0.6 to 25.0 m. The manual recommends not changing this value. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 + **max_range** (*Optional*): This is the maximum detection range. Default is 6 meters (m) with a range of 0.6 to 25.0 m. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 + **trigger_range** (*Optional*): Sets the maximum range at which occupancy can switch to present. The range between max detection range and trigger detection range can NOT cause occupancy to switch to present. Default is 0.6 meters (m) with a range of 0.6 to 25.0 m. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
-+ **hold_sensitivity** (*Optional*): The number represents the ease in which the sensor switches to the present state when someone entered the sensing range of the sensor. Default is 7 (no units) with a range of 0 to 9, higher is more sensitive. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
++ **hold_sensitivity** (*Optional*): The number represents the ease in which the sensor switches to the present state when someone enters the sensing range of the sensor. Default is 7 (no units) with a range of 0 to 9, higher is more sensitive. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 + **trigger_sensitivity** (*Optional*): This number represents ease of continued presence detection after the sensor switched to the present state. Default is 5 (no units) with a range of 0 to 9, higher is more sensitive. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 + **on_latency** (*Optional*): This time value is how long presence is detected before switching to the present state. Default is 0.050 (seconds) with a range of 0.0 to 100.0. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
-+ **off_latency** (*Optional*): This time value is how long presence after is no longer detected before switching to the not present state. Default is 15 (seconds) with a range of 0 to 1500. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
++ **off_latency** (*Optional*): This time value is how long the after the sensor no longer detects presence before switching to the not present state. Default is 15 (seconds) with a range of 0 to 1500. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 + **inhibit_time** (*Optional*): The dead-time after switching to the not present state before presence can be detected again. Default is 1 (seconds) with a range of 0.1 to 255.0. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```PRESENCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
-+ **threshold_factor** (*Optional*): The larger the number the larger the object and more motion is required to trigger the sensor to Target tracked state. Default is 5 with a range of 0 to 65535. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
++ **threshold_factor** (*Optional*): The larger the number the larger the object and more motion is required to trigger the sensor to switch to target tracked state. Default is 5 with a range of 0 to 65535. The ```config_save``` button must be clicked to save the sensor configuration to flash and make operational. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Number Component](https://esphome.io/components/number/#base-number-configuration).
 
 ## Sensors
-+ **target_distance** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates distance to target in meters (m). When **occupancy** binary sensor is ```false``` this sensor is not valid. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration).
-+ **target_speed** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates target speed in meters per second (m/s). When **occupancy** binary sensor is ```false``` this sensor is not valid. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration).
-+ **target_energy** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates target energy in no units. When **occupancy** binary sensor is ```false``` this sensor is not valid. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration).
++ **target_distance** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates distance to target in meters (m). When **occupancy** binary sensor is ```false``` this sensor switches to 0.0 indicating invalid data. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration). 
++ **target_speed** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates target speed in meters per second (m/s). When **occupancy** binary sensor is ```false``` this sensor switches to 0.0 indicating invalid data. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration).
++ **target_energy** (*Optional*): When **occupancy** binary sensor is ```true``` this sensor indicates target energy in no units. When **occupancy** binary sensor is ```false``` this sensor switches to 0.0 indicating invalid data. Available only in ```SPEED_AND_DISTANCE``` mode. All Options from [Sensor Component](https://esphome.io/components/sensor/index.html#base-sensor-configuration).
 
 ## Switches
 + **led_enable** (*Optional*): When turned on the green LED will flash when the sensor has been started. The blue LED cannot be disabled with this command. All Options from [Switch Component](https://esphome.io/components/switch/index.html#base-switch-configuration).