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hass-workstation-service/documentation/WMIQuery.md

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WMIQuerySensor

The WMI query sensor is and advanced sensor that executes a user defined WMI query and exposes the result. It should return a single value.

For example, If you wanted to find the current CPU frequency, the command :

SELECT * FROM Win32_Processor

returns

|64|9|To Be Filled By O.E.M.|3|Intel64 Family 6 Model 94 Stepping 3|252|1|Win32_Processor|4008|12|64|Intel64 Family 6 Model 94 Stepping 3|CPU0|100|198|1024|8192|0|6|4|GenuineIntel|4008|Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz|4|4|8|To Be Filled By O.E.M.|False|BFEBFBFF000506E3|3|24067|CPU|False|To Be Filled By O.E.M.|U3E1|OK|3|Win32_ComputerSystem|GAME-PC-2016|8|1|False|False|

This query cannot be used, and instead you should try

SELECT CurrentClockSpeed FROM Win32_Processor

which results in 4008 for my PC. Because this query retuens a single value (CPU frequency in MHz), it can be used with the current WMI query sensor implementation.

You can use WMI Explorer to find see what data is available, or alternatively look at the user submited sensors below:

Query Explanation Submitted by
SELECT username FROM Win32_ComputerSystem Shows the current user @grizzlyjere
Select * from Win32_Process Where Name = 'notepad.exe' Shows if the defined process is running @lafferlaffer