#Accurate temp sensors?

1 messages · Page 1 of 1 (latest)

mystic kraken
#

Tried some sonoff temp sensors - turned out to be horrible... pairing issues - temp reading innacurate.
What are some recommended temp sensors that are known for their accuracy.

fast island
#

in my limited experience and HA newcomer perspective (not an expert at all) for self-built, non out of the box zigbee devices bosch (?) bme280 sensors and/or copies thereof seemed already way higher frequency and probably higher accuracy than common DVH/DVT(?) or whatever old/cheaper, popular sensors.

In general tmp seems to be way less of a challenge but humidity usually is. so far for tmp/hum sensors I can provide feedback for these two models. not sure if allowed/polite to add direct links even when not affiliated or related to any of the products. I can edit or add direct links afterwards should that be ok.

From Ali:

Reading as following metadata in ZHA:

TS0201
by _TZ3000_dowj6gyi

Brand "Ihseno", with "New upgrade" indication on product images
(But no zigbee 3.0 indication iirc)

Seller: Lvhong Store (Trader)

Title:
Tuya Wifi/Zigbee Temperature And Humidity Sensor Indoor Thermometer Smart Life Control For Home Work With Alexa Google Assistant

These seem alright for TMP, but from observation with meteo stations and other (cheap) sensors, no calibrated device and basic verification of multiweek data I'd say their humidity readings are (maybe) about 5-6% RH too high on average. Most probably non-linear correction is needed for most precise analysis. I use average/linear correction for my purposes as that is close enough for my own semi-"empiric" needs.

One downside or impression I have though is possibly due to higher frequency of readings and/or sensor and/or casing used they seem to get very hot during hot outdoor temperatures and more demanding locations like in between closed sun-side window and sun blind reaching temperatures of 39+ degc to the point of personally worrying about battery and usually removing/avoiding those positions, daytimes or devices for that specific challenge.

#

From Amazon: (imho more recommended)
(But also more like 9-10$ vs. 4-5$ each)

Reading as following metadata in ZHA:

TS0201
by _TZ3000_xr3htd96

Title:
Tuya Smart Room Thermometer Sensor, Wireless Temperature Humidity Sensor with Remote App Notification Alarm for Home, Greenhouse (Requires Zigbee Gateway) Pack of 6

Seller/Brand: ZYWUOY

Unlike first Ali model they come with product images indicating Zigbee 3.0 support.

The TMP in my experience in practical applications is usually not the challenge. But readings for humidity often are way more diverging. I don't have any sort of pro or calibrated tmp/hum device but during late afternoons these seemed to at least align reasonably well when compared to tmp/hum of close by meteo station and are therefore used as my "baseline" for practical tmp/hum "out of the box".

Also most certainly due to way lower reading-frequency I also suspect these to be more reliable for hot or outdoor placement. As lower reading intervals most probably also help in avoiding excessive tmp "build-up".

I did not perform any sort of 100% RH water jar "calibration" etc. The ali sensors were placed next to each other for several hours after unboxing where TMP seemed quite close to each other. While HUM was deviating by usually 1-2%, maybe 3-4% at the very max, if even that. iirc.

Considering awareness about (personally assumed) general or baseline offset it seemed good enough for even more elaborate tmp/hum etc. calculations and observations in practice.

As long as larger offsets are considered I think even less precise hum sensors are good enough in practice: as ultimately it's more about "movement" and relative "comparisons" in practice. (Even for more elaborate indicators or calcs) Unless one aims for anything granular or scientific.

But then I doubt one would even consider entry-level sensors and budget in first place. I'd surely steer clear of anything that doesn't seem to get the basic tmp readings even remotely "right".

sudden spire
#

Hello. I have many sensors xiaomi ( bluetooth reflashed to zigbee) and Sonoff. They all are accurate and work like a charm. Basic config of sonoff is really slow reporting based mainly on temp variation of 0.1deg. In order to be able to modify reports you need to do it within 2 minutes after repair otherwise does not apply, is sleeping. What do you experience.

mystic kraken
sudden spire
#

Buy on Aliexpress same at half price

mystic kraken
sudden spire
#

They behave exactly the same! 0.15 absolute error between the 2 over 3 of each at exact same location. After calibration they follow each other perfectly if you set same report time. Can send temp curve if required. Aquara not tested. Xiaomi the cheapest AND have a screen...

grand hull
#

Yes, the screen is a total win. And the size, the Xiaomi are very small and fits anywhere

sudden spire
#

Just the upgrade procedure can lead to dead device. Just test with one then repeat with all you have...

grand hull
#

Yes, that is the risky part, but to me, it worths

mystic kraken
#

I'll give them a go

charred smelt
#

Had disconnects after a few weeks with my aqara ones. On the up side they have pressure sensors in them. Forget the part number. But I gave up and switched to sonoff SNZB-02P. Been solid connectivity wise for months but I must admit I haven’t properly tested them for accuracy.

fast island
# sudden spire Buy on Aliexpress same at half price

As described that's exactly not my experience at all.

Even for supposedly "identical" sensors or "models". At least it was recently for that specific example of rather heavily researched and searched candidates. Mileage might surely differ with different models.

But same for "half price" for lowend zigbee 2/3.0 sensors etc. from my research, testing and experience is quite the over-simplification. (imho)

same for smoke sensors/alarms as well: half-price, if at all = tedious, not zha compatible only via quirks or z2mqtt (if at all) - while somewhat "pricier" zigbee 3.0 amazon model working instantly, as expected in ZHA in less than 1m each.

with zigbee non-popular or cheaper brands: cheaper imho is often really not better. and "rep"/reliability of popular, more expensive brands isn't exactly great either. I can't speak for xiaomi in zigbee or sensor domain: but I better not mention what I think of their lowend network hw or massive trends to "cloud-powered" hardware in general.