Comments (9)
Interesting question, Unfortunately I have no answer as i did not test high humidity environments.
The limits are based on the datasheet, expect they exist to prevent damage.
(Some thoughts to consider, use at own risk)
First I would run two sensors side by side, one heating and one without, just to study the effect of the constant heating. Preferably in a medium humidity range first.
Second I think i would not use constant heating but a sort of pulse modulation dependant on the humidity.. e.f. range 0-50% duty cycle mapped from 70-100% humidity. Heating cycles of 0..5 seconds followed by 5 seconds cooling. Maybe even shorter to keep the added energy / temp sort of constant
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@chinswain
As this topic is better discussed on e.g. the Arduino forum I close the issue. (it is not sec a library issue)
If you gain some insights and you want to have them added to the documentation of the library, or if you created a specific example for this, please reopen the issue.
from sht31.
@chinswain
As this topic is better discussed on e.g. the Arduino forum I close the issue. (it is not sec a library issue)
If you gain some insights and you want to have them added to the documentation of the library, or if you created a specific example for this, please reopen the issue.
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I've been experimenting with pulsing the heater on and off, then waiting for it to cool and return to the previous temp\humidity - seems to be working very well so far:
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That looks very good,
- humidity stable around 92% (I assume)
- temperature about 25°C (I assume)
works beyond my expectations, I expected to see the pulses of the heater back in the humidity or temperature.
👍
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That's due to my code, I stop gathering data while the sensor is heating up (and cooling down). Here's the data over the heating period:
There's a few degree C increase in temp and a drop in humidity so nice confirmation the sensor is working.
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Great info!
Could you use the value of H as trigger to start / stop the heater?
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I thought about that, but there's no information on what level would require the heater, I guess I could calculate the dew point and heat to prevent condensation. I'm assuming the membrane gets saturated and somehow damaged over time. I rarely get 6 months out of sensors (BME280 etc) so hopefully with periodic heating it'll last a bit longer! I've setup 5 of them on an ESP32, one on each terrarium and another outside.
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OK, that is a good reason to investigate the periodic heating.
keep me informed
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Related Issues (13)
- Exposing the raw temperature and humidity? HOT 6
- SHT31 library two I2C interfaces: example, advice needed HOT 31
- Add lastHeaterStopTime variable to prevent switching on the heater too early HOT 2
- Return 0.0C and 0.0% HOT 5
- isConnected returns true if voltaje to SHT31 is not connected. HOT 4
- SoftWire library + SHT31 library HOT 23
- prototype for 'bool SHT31::begin(uint8_t, uint8_t, uint8_t)' does not match any in class 'SHT31' HOT 6
- check SHT2x functions added HOT 1
- Heater HOT 5
- SHT31 library with Arduino-ESP32 v2.0.5 HOT 8
- support Wire2 for ESP32
- Question on i2c error handling HOT 23
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