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I thought I'd pop this up here, as I've now had mine almost a year.
I've had sonoff zigbee sensors for a while, and wanted to try this slightly updated one with a display.
To cut a long story short:
- It works
- It communicates and pairs with HA ZHA integration out of the box.
- I've not had any issues at all since I bought it.
- The display is clear
- The bracket sticks to the wall, then the sensor magnets into the bracket. The sensor also has a fold-out stand for placing on a surface.
- After almost 1 year on the included battery, it's showing 60%
- I paid about £12, they're now around £14
Battery use should obviously be taken with a pinch of salt, but I would not be surprised if it's still trucking after 2 years.
Accuracy is fine for consumer level gear
I also discovered (after updating to HA latest) that temperature and humidity thresholds can be set on the device.
And that it will show symbols on the display when these limits are breached. By default, it shows a snowflake when it's under 19'C.
So, yeah. For areas where people are likely to want to check the temperature quickly, they're neat little dooberies.
If you want accurate humidity I would highly suggest getting a Sensiron SHT45 and attaching it to an Esp32 with Esphome. These things are fine if you just wanna prevent molds in your apartment, but absolutely useless for anything middle than that
I'm currently eyeing up an Airgradient One, which uses the SHT40.
Unfortunately, I don't have enough tinkering time at the moment to roll out much more kit.
In honesty, I use the relative humidity readings as more of a "it's dry" "It's OK" "it's moist", than expecting any sort of accuracy!
I've even considered mapping percentage ranges to "moist, normal, dry" in HA.
I mean, for most applications +-5% accuracy is perfectly fine. I use them to monitor humidity inside my grow tents, so I need very high precision for VPD calculation