# Sonoff TH with SI7021 humidity sensor

**URL:** <https://discourse.nodered.org/t/sonoff-th-with-si7021-humidity-sensor/33260>\
**Category:** General\
**Created:** [24 September 2020 06:42 UTC](https://discourse.nodered.org/t/sonoff-th-with-si7021-humidity-sensor/33260 "2020-09-24T06:42:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [24 September 2020 08:31 UTC](https://discourse.nodered.org/t/sonoff-th-with-si7021-humidity-sensor/33260/2 "2020-09-24T08:31:16Z")

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What part don't you know how to do?

1. Read the humidity
2. Compare it with a limit
3. Switch the fan off/on

**[Edit]** If point 2 is the issue see this recent thread asking a very similar question [Front montant du signal](https://discourse.nodered.org/t/front-montant-du-signal/33145)  
Read the full thread.

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_[View the full topic](https://discourse.nodered.org/t/sonoff-th-with-si7021-humidity-sensor/33260)._