TASMOTA Smart Dimmer Switch by Martin Jerry | ESP8266, Smart Light Switch That Work with Home Assistant | 2.4G WiFi Smart Home Devices and Needs Neutral Wires, 1 Pack

I purchased three of these to control some exterior lights. The build quality was great and they installed with ease. By the way, it's not listed anywhere, but in case you're wondering the depth the switch required inside the electrical box is slightly over 1.25 inches (plus wires). This is important, since many electrical boxes don't have a lot of space.The switches came with Tasmota 12.1, which I was able to easily upgrade to 14.1. For the person who received switches with version 6.3 and failed to upgrade to 12.1: be aware that a direct upgrade is not possible. See the tasmota upgrade documentation; you'll need to go through several version upgrades to get to 12.1.I use my own scripts with cron to control the lights, so I can't speak to Home Assistant or other automation platform compatibility. But the HTTP interface to the switches works perfectly. I'm able to turn them on/off, set the dimmer level, and get the current status. The response time when executing these commands is instantaneous.The one negative I have is that the dimmer range is not very good. I think this is because I use LED lights and this switch has leading-edge dimming. When the dimming level is set to 45% the lights are basically off. 50% is barely on. Martin Jerry makes another switch, the US-SD-TC01 which has trailing-edge dimming, that is more suitable for LED lights. I should have done more research and picked those switches for my application, but that's on me not the switches, so I'm not going to take away any stars for that. Plus, I just set the lights between 50% and 100% instead of 0% to 100%.Overall, I'm quite happy with these switches in the short time I've had them.

This Tasmota pre-flashed unit works out of the box with no internet connectivity requirements. You will need a wifi network with DHCP, but that's it. I disassembled the unit and the build quality was good, it appears to be on-par with other name-brand in-wall modules I've bought at the local home center. The main switch is a proper microswitch, not a cheap PCB pushbutton, so it should last. The tactile feel is very different from a regular switch, though, so be advised. More like clicking a mouse than toggling a switch. The Tasmota firmware supports a timer mode so this is a no-brainer replacement upgrade for in-wall timers. I recommend and am glad this company is making them.The dimmer function is pretty neat. The software records the button selected dimmer, so you can fiddle with it via the API but when you hit the button it goes back to the button selected level. I can see that being useful. It does have a relay so when it's off it's off. It also has a temperature sensor on the triac for overtemp protection. That said the dimmer triac is a TO-220 package in a plastic box in the wall, so the low watt rating is real. Bench testing it with a incandescent bulb it behaved exactly how I'd expect.It does need a unswitched power feed with a neutral wire. Design requirement, no way around it. The one point I didn't like is the mounting ears are plastic, with the cover screws threading into plastic. It didn't seem to be an issue on install into a properly leveled box, though, the screws tightened okay and the switch was solid.

this device was easy to install and setup in Home Assistant but unfortunately it failed yesterday after 3 months from purchase. Sent an email to manufacturer to see if they will warranty it

THE BAD -While this is a good dimmer, it's not a great dimmer. MJ still uses leading-edge dimmers rather then the far superior trailing-edge dimmers, but outside that, this is a great product.THE GOOD -Comes with Tasmota preflashed, so automatic win. The icing on the cake is the build quality, the matte screw-less non-branded faceplate, the great packaging, and the build quality [listed twice for a reason].Many products use standards mouse button-like switches that have a very light, high-pitched quiet click as expected. The MJ switches have a nice heavy tactile sound and feel that at least give the impression of higher quality. I MUCH prefer this!!!With the LED lights I use, they do not activate unless the dimmer is above about 45%. This can be corrected in the Tasmota dimmer range settings. They can, however be dimmed down to about 2% if you start with them on first. This is the drawback to using leading edge dimmers and just can't be resolved. So, either know the limitations and adjust your code accordingly, or adjust the range to avoid it and just not dim as low.MJ, keep up the good work releasing preflashed Tasmota and consider trailing-edge in the future. Might cost a bit more, but a quality device is worth it.

Really glad to see Martin Jerry supporting open firmwares. They have good quality switches, and the setup process and usage is so much better with Tasmota. ESPHome was easy enough to flash, and works great. The only hiccup is that you have to be sure to flash Tasmota minimal before flashing your ESPHome firmware. After flashing, you might need to power cycle the switch to get dimming to work properly.Hardware wise, the buttons have good tactile feedback and aren’t mushy. The LEDs are a good brightness for most places, and are really nice for finding the switch in the dark. By default, the ESPHome firmware from the esphome-devices website has the red LED on when the switch is off, which works well.

Tasmota support without having to flash it is great. Tasmota has many options that make it extremely useful without any additional home automation environment. The ability to define tasmota groups that use multicast without relying on Openhab or Home Assistant is very useful and extremely reliable. That said, open source support for multiple HA integrations is also very useful.