# Alexa mis-reads Hygrometer/Temperature sensors

**URL:** <https://community.homey.app/t/alexa-mis-reads-hygrometer-temperature-sensors/135099>\
**Category:** Questions & Help\
**Created:** [April 20, 2025, 11:12pm UTC](https://community.homey.app/t/alexa-mis-reads-hygrometer-temperature-sensors/135099 "2025-04-20T23:12:12Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [April 21, 2025, 7:41pm UTC](https://community.homey.app/t/alexa-mis-reads-hygrometer-temperature-sensors/135099/2 "2025-04-21T19:41:33Z")

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This is what app developers are ought to do:

 ![1000046766](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/d/3/d32c1c97d853163c87e9476ed61f93511239904d.jpeg)

In theory, Alexa should read the temps from Homey in °Celsius, if your location uses °Celsius in general.  
What’s the standard unit in your country?

You can convert the “Alexa thinks it’s °F” values to “°C values for Alexa”, with use of an [advanced virtual device](https://community.homey.app/t/app-pro-device-capabilities-addendum-fully-customisable-advanced-virtual-device-with-unique-text-status-indicator/68198);  
Then you should have that virtual device report to Alexa, instead of the original device.

Result example:  
Left: sensor °C,  
Right: virtual sensor with the “Alexa thinks it’s °F” values converted to “°C values for Alexa” :

 ![1000046774](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/f/c/fc68eacf0616d5b71314ba596dd9d31f81f86c94.jpeg)

Setting:

 ![1000046777](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/3/b340c70a7277f615279c6711c6acf257f581f22f.jpeg)

BLL expression used:  
`Math.round(5/9*($value-32))`  
No flows needed! It gets calculated with every temperature value update.

Note: You’ll need to install the [Better Logic app](https://homey.app/en-nl/app/net.i-dev.betterlogic/Better-Logic-Library/) as well for this to function

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_[View the full topic](https://community.homey.app/t/alexa-mis-reads-hygrometer-temperature-sensors/135099)._