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arendst / Tasmota

Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at
https://tasmota.github.io/docs
GNU General Public License v3.0
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Change TEMP_ADJUST, Press_ADJUST #422

Closed timtimsson closed 6 years ago

timtimsson commented 7 years ago

Hello, my bme280 is working with a little offset - is it possible to fix this ? PressAdj -> %value%+-100 Best regards

arendst commented 7 years ago

Your next bme280 will have another offset. No guarantee it's lineair either...

davidelang commented 7 years ago

I think what he's asking for is a per-sensor adjustment config option.

mihalski commented 7 years ago

I'm more interested in how to calibrate these sensors? How can you know that the OTHER sensor you are using isn't the one that's offset?

timtimsson commented 7 years ago

offset, a good question... for temperature, i use a analog human clinical thermometer to compare pressure, humi - i use a official outdoor weatherstation, not far from me, with a dht/esp8266 outside my car with 12V/USB charger... Please do not laugh about me.... :)))

davidelang commented 7 years ago

ice water bath and boiling water bath (the boiling water bath needs to be adjusted for your altitude)

calibrate one sensor and then use it to calibrate your others.

mihalski commented 7 years ago

I suspect that if I throw the sensor in boiling water it may malfunction :/

And ice water bath won't necessarily be 0 degrees Celsius will it?

davidelang commented 7 years ago

I don't remember which sensor is which, but I'm pretty sure that the waterproof ones are rated up above boiling water.

an ice water bath will be 0C, if it was lower, it would be solid ice, if it was higher, it would melt the ice. It's only at 0C that the two states can co-exist.

Similarly with a boiling water bath, liquid water at seal level pressure can't go above 100C, any higher than that and it becomes vapor, any lower and it's not boiling. So heat water to a rolling boil and it will be 100C (at sea level, adjust for your alititude)

zissouz commented 7 years ago

It seems there is a general issue with the BME280 see here for fix

https://github.com/letscontrolit/ESPEasy/commit/1d1d69a13ff0ecc5422bb3b900107bb3013f389b

Id be really grateful if we could get this in, it seems to be a wider issue. I understand the issue to be that it samples too often and overheats.

Sjaakafhaak commented 7 years ago

I was just searching for the same thing timtimsson would liked to have.

Is there away to adjust temp? If yes where can i fill in this adjustment?

Thanks in advance

stale[bot] commented 6 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

stale[bot] commented 6 years ago

This issue will be auto-closed because there hasn't been any activity for a few months. Feel free to open a new one if you still experience this problem.