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Quick look inside Venstar T7850 - One of the only 'no-cloud' WiFi Thermostats that plays nice with Home Assistant

Info
As of 2022-05-11, there is an update on my experience with the thermostat below!

This is another one of those posts from my never ending quest to integrate Home Assistant with All The Things!

The thermostat that was installed when I moved in was an early Nest thermostat. These thermostats are - for the most part - well reviewed and liked. I had no complaints… except one.

Inside a generic/white-label HDMI KVM Switch

If you’re here just for “how do I get it working with ESPHome” bit, skip to the ESPHome Component section below.


Update 2022.05.14
I have just uploaded a basic PCB and enclosure to the ESPHome Component Repository.

For the last few months, I have been looking for a KVM switch to simplify switching between work and personal computers. Initially, I didn’t think my criteria were that unreasonable, but for whatever reason there is no KVM switch that:

Installing Tasmota on the Xiaomi Desk Lamp

MJGJD02YL vs MUGJD01YL
There are at least two versions of this lamp. Thanks to @htvekov for confirming that the MUGJD01YL variant does not contain an ESP32. It contains a TLSR8368. Some photos of the MUGJD01YL internals are provided below.

If you’re here just for “how do I flash tasmota” bit, skip to the Tasmota section below.

Now with ESPHome
ESPHome support for the single-core ESP32 chip in the lamp has come a long way. You can find the ESPHome configuration that I used with this lamp below.

I was looking for a way to light my desk my desk without screen glare. The easiest way to prevent glare on a screen is to change the orientation of the light relative to the screen either from under or behind the screen. This is not practical for ceiling mounted lights or for any floor lamps.

Using Home Assistant to dynamically layout openHasp widgets

Background

This is one of those posts that sat in the Drafts folder for way too long. Just before release, I’d discover something new that would warrant substantial rewrites. After several delays, false starts and re-writes, I finally have something that is mostly new and worth sharing with the world.

Like with the past few teardown posts, this one also started off as a ‘cart-stuffer’ item so I could unlock a more generous discount on the total purchase. The listing that caught my eye had the generic title:

Generic RGB Wall Switch teardown

Yep! Another teardown post! This one was also a cheap “because i’m curious” post.


What

It’s a ‘decora’ style wall switch with WiFI and an RGB color changing paddle.

Picture from the product listing; device is rendered

The product listing was very non specific:

EU US WiFi Smart Wall Switch Push Button Timer Relay Switch Voice Remote Control RGB LED Night Light Lamp TUYA Alexa Google Home

I saw TuYa in the item description and hoped that it would be based on an ESP8266 module or at least use a pin-compatible module. After all, there are a few such devices on the Wall Switches and Dimmers section of the tasmota templates repository.