Beiträge von jammin

  • Shelly HT erroneous readings

    Yes I have similar results with mine. The temperature is accurate when compared to other sensors I have, but the humidity is way out. When the average of a bunch of other sensors (and the reported weather service humidity) is around 45%, the Shelly H&T is reporting 69% !

    In addition to the inaccuracy, you can see in the attached chart it's very slow to react to changes. This shows it placed in the bathroom right next to an aqara zigbee sensor, and the spikes are two seperate uses of the shower. This is my primary use for this sensor - turning on the fan when the humidity spikes from the shower and off when it returns to normal. You can see in the chart how slowly it both rises AND falls compared to the aqara.

    I currently have an offset entered of "-24" which at some levels makes it correct, but as you can see in the chart, and as tested above by libreiot, the innacuracy is much less when closer to 100% and the offset would make it vastly underreport at this level.

    I've relegated my H&T to a task that requires less precision, and am only using Zigbee sensors now (I've been really impressed by the Aqara ones). Still love my Shelly relays & dimmers, but IMHO all the battery based products suck (this is as much a weakness of WiFi than the Shelly implementation itself)

  • Shelly Dimmer2 - Control with Shelly Button1

    I've been testing the same setup, but using Home Assistant as the middleman.

    To save battery, tThe Shelly Button 1 has to wake up the wifi radio and connect to your access point each time the button is pressed. In my case, this means a delay of 3-6 seconds, and sometimes as you said it just doesn't work at all.

    For the purposes of a light switch, this is way too long and the button is practically useless to me.

    Luckily I only bought one for testing.

    I'm installing extra switches around my house as "soft buttons" for for the purposes of either virtual 2-way switching a light, or controlling multiple lights together in a scene. I'm using the SW2 input on a Shelly Dimmer 2 for these. This does nothing to the light on SW1 as the dimmer is setup in Single Switch mode, however it does send the button push event to my Home Assistant server, which can then do what I've programmed it to do (turn on a lamp on a smart plug, turn on all lights in room or something similar). You can do something similar directly with the Shelly Dimmer using "events". This may not be of use to you, but I think some kind of hard wired button is really the only option for reliable, responsive light switches.