# Enviro pHAT pressure **URL:** \ **Category:** Support\ **Created:** [March 27, 2017, 6:24pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423 "2017-03-27T18:24:28Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![kertib](https://avatars.discourse-cdn.com/v4/letter/k/73ab20/32.png) [@kertib](https://forums.pimoroni.com/u/kertib)\ **Post date:** [March 27, 2017, 6:24pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/1 "2017-03-27T18:24:28Z")
I have two Enviro pHAT (EnviropHAT and EniropHAT2) The ADC male header is soldered on the EnviropHAT. ![](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/9/99a8eb6866a47a16e30562e38fbef585cafcae4d.jpg) The EnviropHAT measures negative (!) and too low peressure: pi@EnviropHAT:~ $ python Python 2.7.9 (default, Sep 17 2016, 20:26:04) [GCC 4.9.2] on linux2 Type “help”, “copyright”, “credits” or “license” for more information. > > > from envirophat import weather > > > print weather.pressure() > > > -1999.38893246 EnviropHAT2 measures correct pressusre: pi@EnviropHAT2:~ $ python Python 2.7.9 (default, Sep 17 2016, 20:26:04) [GCC 4.9.2] on linux2 Type “help”, “copyright”, “credits” or “license” for more information. > > > from envirophat import weather > > > print weather.pressure() > > > 101146.517167 What is the problem? Best regards, Balazs ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [March 31, 2017, 9:37am UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/2 "2017-03-31T09:37:48Z")
This is odd- do you get any change in the pressure value if you (gently) press upon the sensor? ---
**Author:** ![kertib](https://avatars.discourse-cdn.com/v4/letter/k/73ab20/32.png) [@kertib](https://forums.pimoroni.com/u/kertib)\ **Post date:** [March 31, 2017, 10:29am UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/3 "2017-03-31T10:29:58Z")
I work in a laboratory so I put both Enviro pHAT + zero + power bank trio into a vacuum desiccator [https://en.wikipedia.org/wiki/Desiccator](https://en.wikipedia.org/wiki/Desiccator)) and made vaccum from 101kPa to 90kPa .The Enviro pHAT2 meausred increased pressure, Enviro pHAT pressure change was not significant. I have noticed that the soldering is not perfect, as shown in the picture. ![](https://us1.discourse-cdn.com/flex016/uploads/pimoroni/original/2X/e/e32ad34425fae0864822fb53c925631ad0aff32a.jpg) It could cause the problem? Best regards, Balazs ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [March 31, 2017, 2:03pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/4 "2017-03-31T14:03:24Z")
It’s _possible_ that imperfect soldering could be the problem, but unlikely. I suspect somethings gone wrong with the barometer. I’ve seen your support email, and will make sure it’s assigned to someone who can send you a replacement. ---
**Author:** ![Richard238](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard238](https://forums.pimoroni.com/u/Richard238)\ **Post date:** [November 17, 2020, 5:15pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/5 "2020-11-17T17:15:53Z")
Out of curiosity, and the opportunity to add this to my Initial State dashboard, I tried pressure from my Envirophat:. ``` from envirophat import weather print weather.pressure() ## 101628.297734 ``` 101628…! What on earth?! Any ideas, please. Thank you. ---
**Author:** ![Shoe](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shoe](https://forums.pimoroni.com/u/Shoe)\ **Post date:** [November 17, 2020, 8:19pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/6 "2020-11-17T20:19:40Z")
In [the envirophat guide](https://learn.pimoroni.com/tutorial/sandyj/getting-started-with-enviro-phat) they use the line: `print(weather.pressure(unit='hPa'))` Which prints out a reasonable hPa value, so I can only presume that the raw value without the unit parameter is pascals, not hectopascals. ---
**Author:** ![lexfiend](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/lexfiend/32/7136_2.png) [@lexfiend](https://forums.pimoroni.com/u/lexfiend)\ **Post date:** [November 18, 2020, 6:53am UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/7 "2020-11-18T06:53:21Z")
1 standard atmosphere is 101,325 pascals, so that’s not exactly unexpected. ---
**Author:** ![Richard238](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard238](https://forums.pimoroni.com/u/Richard238)\ **Post date:** [November 21, 2020, 2:53pm UTC](https://forums.pimoroni.com/t/enviro-phat-pressure/4423/8 "2020-11-21T14:53:20Z")
I was already using `(weather.pressure(unit='hPa'))` But Initial State was showing the wrong figure. Changed it in IS to `"=math.round(convert([Pressure],"pa","hpa"),0)"`, and all is good. Thank you.