Soil Humidity and temperature sensor - SHT1x

[epierre]

Here is the one I have (not from this store): Digital Temperature & humidity sensor (With Stainless Steel Probe)

It is calibrated and use the SHT1x library yet not present in MySensors.

Here is my first code, that I have adapted but found in principles very close to the DHT11 example:
https://github.com/empierre/arduino/blob/master/SoilMoistSensorSHT1x.ino

Mine does not seems to be immersible, there are some other around that are given such:

• SHT10 with protection
• Davis/Watermark reference
• alternative for existing sketch with immersion gold treatment

[epierre]

@hek a new unit if properly done !

cb (centibar) http://www.irrometer.com/basics.html

0-10 Saturated Soil. Occurs for a day or two after irrigation 
10-20 Soil is adequately wet (except coarse sands which are drying out at this range) 
30-60 Usual range to irrigate or water (except heavy clay soils). 
60-100 Usual range to irrigate heavy clay soils 
100-200 Soil is becoming dangerously dry for maximum production. Proceed with caution.

[hek]

@epierre said:

cb (centibar)

Nice to leran new things every day. Irrometer!

[epierre]

Hello,

now I have an issue: I wired it (correctly) yesterday and readings give me -40°C and 5.5 Humidity...

adafruit description

Also this kind of sensor can be partially buried, only the front part, not the whole, I may consider having a look to the Watermark/Davis one they use in libellium or make myself one.

[epierre]

Here are my readings:

Temperature: -258.4599914550C / -433.2279968261F. Humidity: -1732.49%
Temperature: 285.2200012207C / -41.5480003356F. Humidity: -1732.49%
Temperature: -258.4599914550C / -433.2279968261F. Humidity: -1732.49%
Temperature: 285.1900024414C / -46.1559982299F. Humidity: -1732.49%
Temperature: -258.4599914550C / -433.2279968261F. Humidity: -1732.49%
Temperature: 178.4499969482C / -44.6080017089F. Humidity: -1732.49%

[epierre]

ok found, you need the Sensirion Version 2.0 - 10Dec2010 !!!

Temperature: 26.12 C, Humidity: 61.71 %, Dewpoint: 18.19 C
Temperature: 26.10 C, Humidity: 61.70 %, Dewpoint: 18.17 C
Temperature: 26.10 C, Humidity: 61.76 %, Dewpoint: 18.19 C
Temperature: 26.10 C, Humidity: 61.82 %, Dewpoint: 18.20 C
Temperature: 26.09 C, Humidity: 61.88 %, Dewpoint: 18.21 C