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20 Aug 2017
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TOPIC: Building the induino MeteoStation with 3d printed housing

Building the induino MeteoStation with 3d printed housing 1 month 4 weeks ago #20122

I decided the same way :) 3D printer purchased and on the go.

"I am sorry for my English" :(

One question:

What causes drops of moisture on IR sensors?

I found this Czech project and have an IR sensor covered with HDPE dome.
Has heating to eliminate moisture.
http://www.mlab.cz/Designs/MRAKOMER4/DOC/mrakomer41_en.pdf

Thanks :cheer:

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Building the induino MeteoStation with 3d printed housing 3 weeks 1 day ago #21043

Hey Magnus,

I've downloaded the latest code from github, re-installed the all thing from the Arduino to the html code.
It's working correctly, however the pressure isn't showing as your latest graph. Kind of stuck at 1000 on the web page while the indi show 1022.

fixed, changed:

1013.25 to 1043.25
# grep 1043 /home/meteostationWEB/html/index.html
var P0=(1043.25/Math.exp(altitude/8000)) | 0;

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Last Edit: by Gonzothegreat.

Building the induino MeteoStation with 3d printed housing 3 weeks 1 day ago #21046

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@gonzo Good thing you fixed it. I have not really changed anything on the webapp. Only the config and start, stop script. My pressure sensor is also a little off (mine is to high). I'll try your approach to calibrate it :)

@kalda. If you worry about moisture on the IR sensor, it looks like you could just glue on that dome. However I have not notized any difference from the sensor with or without raindrops on it.

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Building the induino MeteoStation with 3d printed housing 3 weeks 1 day ago #21049

One tip to everyone: do NOT get the DHT wet.... they tend to die when wet... :whistle:

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Building the induino MeteoStation with 3d printed housing 3 weeks 11 hours ago #21097

I'm a little concerned with the DHT sensor, somehow it doesn't look like it's reporting the right humidity %.
ie: today, it's been raining most of the day, the weather box is outside, the sensor is protected against direct contact with the rain but not restricted.
Only measured %53 humidity.

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Building the induino MeteoStation with 3d printed housing 3 weeks 10 hours ago #21103

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Not sure if it's a little too sensitive.
Mine shows 100% when it's raining. However if the sensor is wet, then it will have to dry off for a few days.

Im not sure if there is a better more tolerating sensor out there.

I will see if i can print some slits to cower the openings with. To avoid the sensor getting wet.

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Building the induino MeteoStation with 3d printed housing 3 weeks 10 hours ago #21104

I'm going to wipe the arduino and test the following code:
playground.arduino.cc/Main/DHTLib

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Building the induino MeteoStation with 3d printed housing 3 weeks 9 hours ago #21107

Here's my test
The meteo box is in a container with water, not too much so it's not touching the sensor, it's closed (let's say, almost sealed).
I uploaded a test sketch to check the DHT22.





It's been a good 5 min or so, it reached 70%. Not sure if this is right or wrong.
Attachments:

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Building the induino MeteoStation with 3d printed housing 3 weeks 8 hours ago #21109

I'm currently doing a second test, this time it's with my spare DHT22, plugged it on it's own, in the same water container.
As you can only poll this sensor every 2s, I have to say that it's slow to read the humidity, very slow...

I did get it wet by accident, and that went to 99% very quickly.. lol, a good use of the hair dryer and that fixed it.


Edit:
when I say slow, I really do mean slow...

Humidity: 59.60 % Temperature: 21.40 *C 70.52 *F Heat index: 21.15 *C 70.07 *F
Humidity: 59.60 % Temperature: 21.40 *C 70.52 *F Heat index: 21.15 *C 70.07 *F
Humidity: 59.70 % Temperature: 21.40 *C 70.52 *F Heat index: 21.15 *C 70.08 *F
Humidity: 59.80 % Temperature: 21.40 *C 70.52 *F Heat index: 21.16 *C 70.08 *F
Humidity: 59.90 % Temperature: 21.40 *C 70.52 *F Heat index: 21.16 *C 70.09 *F
Humidity: 60.00 % Temperature: 21.40 *C 70.52 *F Heat index: 21.16 *C 70.09 *F
Humidity: 60.00 % Temperature: 21.40 *C 70.52 *F Heat index: 21.16 *C 70.09 *F
Humidity: 60.10 % Temperature: 21.40 *C 70.52 *F Heat index: 21.16 *C 70.10 *F
Humidity: 60.10 % Temperature: 21.30 *C 70.34 *F Heat index: 21.05 *C 69.90 *F
Humidity: 60.10 % Temperature: 21.30 *C 70.34 *F Heat index: 21.05 *C 69.90 *F
Humidity: 60.20 % Temperature: 21.30 *C 70.34 *F Heat index: 21.06 *C 69.90 *F
Humidity: 60.30 % Temperature: 21.30 *C 70.34 *F Heat index: 21.06 *C 69.91 *F
Humidity: 60.30 % Temperature: 21.30 *C 70.34 *F Heat index: 21.06 *C 69.91 *F
Humidity: 60.30 % Temperature: 21.20 *C 70.16 *F Heat index: 20.95 *C 69.71 *F
Humidity: 60.50 % Temperature: 21.30 *C 70.34 *F Heat index: 21.07 *C 69.92 *F
Humidity: 60.50 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.72 *F
Humidity: 60.60 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.72 *F
Humidity: 60.60 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.72 *F
Humidity: 60.70 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.73 *F
Humidity: 60.80 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.73 *F
Humidity: 60.80 % Temperature: 21.20 *C 70.16 *F Heat index: 20.96 *C 69.73 *F
Humidity: 60.90 % Temperature: 21.20 *C 70.16 *F Heat index: 20.97 *C 69.74 *F
Humidity: 60.90 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.54 *F
Humidity: 60.90 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.54 *F
Humidity: 61.00 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.54 *F
Humidity: 61.10 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.55 *F
Humidity: 61.10 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.55 *F
Humidity: 61.20 % Temperature: 21.10 *C 69.98 *F Heat index: 20.86 *C 69.55 *F

each line is 2 seconds. I started from 20% ...

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Last Edit: by Gonzothegreat.

Building the induino MeteoStation with 3d printed housing 3 weeks 8 hours ago #21111

The doc for the DHT22 mentions that the reads should be every 2 seconds at a minimum, and from looking online I also see this:
"The DHT22 only allows readings once every two seconds to prevent self-heating in the chip, since that would skew the humidity readings."

Where in the code, do we have the timeout set to read the DHT please, cannot find it?

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Building the induino MeteoStation with 3d printed housing 3 weeks 8 hours ago #21114

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Not sure what sketch you are using, but it will have a event loop.

If you look for where the text is printed, it might have a sleep(2) or 2000 just as the last function.

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Building the induino MeteoStation with 3d printed housing 3 weeks 8 hours ago #21115

Magnus_e wrote: Not sure what sketch you are using, but it will have a event loop.

If you look for where the text is printed, it might have a sleep(2) or 2000 just as the last function.


Thanks, I'm using the latest one available in github.

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