UV - VEML6075

UVA/UVB Sensor

Plugin details

Type: UV

Name: VEML6075

Status ESP32: COLLECTION D

Status ESP8266: COLLECTION D

GitHub: P114_VEML6075.ino

Maintainer: TD-er, clumsy-stefan, tonhuisman

Used libraries: .

Description

This I2C sensor with 2 resolutions (normal/high dynamic) offers UVA (365 +/-10 nm) and UVB (330 +/-10 nm) measurement and a calculated UVIndex value. Output result for UV is in irradiance, watt per square metre. The maximum value that can me measured is 65535, as the chip provides 16 bit values.

NB: If the unit is over-exposed, possibly the measurement could exceed the maximum returned value of 65535, and the calculated UVIndex value will not be correct.

NB2: When measuring outside UV exposure, the sensor should also be outside, as f.e. window glass filters out most UV radiance, and measurements will be (very) inaccurate.

Configuration

Name A unique name should be entered here.

Enabled The device can be disabled or enabled. When not enabled the device should not use any resources.

I2C Options

The available settings here depend on the build used. At least the Force Slow I2C speed option is available, but selections for the I2C Multiplexer can also be shown. For details see the I2C Bus page

I2C Address: The address the device is using. Depending on the board used, when available a SDO pin, or soldering a 0 ohm resistor on a different location, can be used to select the used address. If that address selection is not available, then an I2C multiplexer (in a matching ESPEasy build) can be used to use multiple sensors on a single ESPEasy unit.

Device Settings

Integration Time: The integration time setting of the sensor determines the accuracy of the measurement. There are 5 options available:

50 ms The default value, using an integration time of 50 msec.

100ms

200ms

400ms

800ms

Usually a higher integration time results in a more accurate measurement.

Dynamic Setting: This determines the dynamic setting:

Normal Dynamic

High Dynamic For better response to changing conditions during measurement.

Data Acquisition

This group of settings are standard available configuration items.

• Single event with all values: When this setting is enabled, all available values will be sent in a single event <TaskName>#All, with all values in order as arguments to the event.

• Show derived values: When checked, the Devices overview page, and the /json endpoint (used for updating the Devices overview page) will include any Derived values as defined. See the TaskValueSetDerived and TaskValueSetPresentation commands.

• Event & Log derived values: When checked, the Derived values will be generated as Events, to be handled in Rules, and sent to logging devices like the Syslog server and/or SD-card logging.

(The derived values options are only available if String variables feature is included in the build.)

• Send to Controller: Select the Controller(s) to send the Values to, either on a TaskRun command applied to the task, or on an Interval time action.

Send to Controller is only visible when one or more Controllers are configured.

Depending on the controller capabilities, some configuration settings may be shown:

All configured Controllers are shown here, including the enabled or disabled state (multiple Controllers can be enabled, only a single MQTT Controller can be enabled at one time!).

For each controller the user can select wether the data should be sent on each Interval (or explicit TaskRun).

For the Domoticz controllers the value index (IDX) has to be configured.

For some controllers, like Home Assistant/openHAB, there are extra options available.

• Group: This represents the group id to combine all values from multiple tasks into a single grouped-device during MQTT AutoDiscovery. Groups, by design, can span multiple ESPEasy devices, if desired, as long as the Task/Valuename combinations are unique. If a group should only combine Tasks from a single ESPEasy unit, the group id should be unique across multiple ESPEasy units. The group description, default Group <n>, can be adjusted in Home Assistant. If the Group value matches the current Unit nr, the Unit name, %sysname%, is used instead of Group <nr>.

• Retained: For MQTT Controllers, this setting can be enabled to send the values for the current task with the Retain flag set. The Publish Retain flag in the Controller settings will override this by sending all task values with Retain flag enabled.

• Send derived: This checkbox determines if any configured Derived values should also be sent to the controller (and included in the AutoDiscovery if that’s available and enabled).

• Resend MQTT Discovery: When checked, will start a resend of the MQTT Discovery process for this task after a random delay, when Submit is clicked, so any changed settings will be updated in the MQTT broker. This setting is only available if the controller is enabled, the Auto Discovery feature is available and enabled for the controller. This setting is not stored.

Other controllers, like f.e. FHEM HTTP, do not support additional settings besides the checkbox to enable sending the data.

Interval By default, Interval will be set to 60 sec. The minimum value allowed is 1 sec. but for measuring UV values, that don’t change very quickly, reasonable values should be between 10 and 300 sec.

Values

The measured values are available in UVA, UVB and UCIndex. A formula can be set to recalculate. The number of decimals is by default set to 2, and can be set to 0 for UVA and UVB, as no decimals are provided from the measurement. UVIndex value is often used without decimals, but can be set as desired.

Change log

Changed in version 2.0: added 2021-04-24 Moved to main repository as Plugin 114 UV - VEML6075 UVA/UVB Sensor from the ESPEasyPluginPlayground (P130).