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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.
How did you check the accuracy of the humidity sensor? All of the cheap ones tend to drift/fail fairly quickly, especially if there is condensation (high humidity). This includes initially highly accurate sensors like BME280.
I knew this would come up, which is why I threw in the "ok for consumer gear" line.
I don't have any super accurate sensors at home to test against, but to be honest, cheap hydrometers are best for vague ranges. "It's damp", "it's normal", or "It's dry".
Which is actually what I use it for: It's in the bathroom to send alerts to open or close the windows based on humidity and outside conditions.
Compared to the rest of the sensors in the house, when the windows are open and air in the house is normalised, it's within 5%, which is about all I could really hope for.
Sling psychrometer