# Calc dewpoint from BME280

**URL:** <https://discourse.nodered.org/t/calc-dewpoint-from-bme280/21047>\
**Category:** General\
**Created:** [30 January 2020 16:22 UTC](https://discourse.nodered.org/t/calc-dewpoint-from-bme280/21047 "2020-01-30T16:22:56Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![krambriw](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/krambriw/32/5429_2.png) [@krambriw](https://discourse.nodered.org/u/krambriw)\
**Post date:** [30 January 2020 16:41 UTC](https://discourse.nodered.org/t/calc-dewpoint-from-bme280/21047/2 "2020-01-30T16:41:44Z")

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> [@triphil](#):
>
> Is there another way of doing it?

I do not know a better way, I have not seen any node for that type of calculation but there are many flows and samples you may find on the net

I think I posted the code in here somewhere,,,how I do the calculation, I will have to search

Edit: I knew it, here it is

> [@New bathroom ideas](https://discourse.nodered.org/t/new-bathroom-ideas/19980/59):
>
> You nailed it. This is the key point to keep track of. I have been monitoring this since years in certain areas in hour house (in the ground and in the attic) using sensors and related logic in Node-RED (earlier with EventGhost). I'm measuring the temperature & relative humidity, calculating the delta (difference from actual temperature to dew point). If delta goes negative there is a problem. Luckily we have never had any condensation so far, I have also verified this regularly with an instrum…

In this example I calculate the delta which is the interesting part, i.e. how many degrees you have left before condensation will happen

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