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INDI Library v2.0.7 is Released (01 Apr 2024)

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Building the induino MeteoStation with 3d printed housing

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Replied by Magnus on topic Building the induino MeteoStation with 3d printed housing

@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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6 years 5 months ago #21046

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

One tip to everyone: do NOT get the DHT wet.... they tend to die when wet... :whistle:
6 years 5 months ago #21049

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

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.
6 years 5 months ago #21097

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Replied by Magnus on topic Building the induino MeteoStation with 3d printed housing

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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Build thread @ SGL: Starting summers observatory project
6 years 5 months ago #21103

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

I'm going to wipe the arduino and test the following code:
playground.arduino.cc/Main/DHTLib
6 years 5 months ago #21104

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

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.
6 years 5 months ago #21107
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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

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...each line is 2 seconds. I started from 20% ...
Last edit: 6 years 5 months ago by Gonzothegreat.
6 years 5 months ago #21109

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

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?
6 years 5 months ago #21111

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Replied by Magnus on topic Building the induino MeteoStation with 3d printed housing

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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6 years 5 months ago #21114

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing


Thanks, I'm using the latest one available in github.
6 years 5 months ago #21115

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Replied by Gonzothegreat on topic Building the induino MeteoStation with 3d printed housing

Been reading quite a few posts online, found this interesting one: www.stevejenkins.com/blog/2014/06/how-to...using-the-salt-test/

my test is almost done I would say, been seating at almost 74% humidity for a while now
6 years 5 months ago #21117

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Replied by Magnus on topic Building the induino MeteoStation with 3d printed housing

I like the test in the link you posted :)
Also suggest that your sensor is working.
Proud owner of Observatory 17b - A remote Linux observatory.
Website: Observatory 17b
Build thread @ SGL: Starting summers observatory project
6 years 5 months ago #21118

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