TASMOTA 3 Way Smart Switch by Martin Jerry | ESP8266 2.4G WiFi, Smart Light Switch for Home Assistant | Smart Home Devices

I ordered the "TASMOTA 3 way Smart Switch by Martin Jerry". The model number in the listing is the S01. I received an ST02 which was exactly what I was looking for. Tasmota came right up on it after powering it on. It came stock with Tasmota 12.1. I flashed with the minimal version of 12.1 and was then able to flash it with esphome after that. Installed it without any issues and it works great. Thanks, Martin Jerry!

Works great easy to setup

I'm a huge fan if this idea: Pre-flashed with tasmota 3 way switch! It did not go as plannedI bought quite a few of these and ended up having to remove half of them. Turns out that many even high quality 3 way "dumb" switches leak just a tiny amount of voltage to the "off" traveler wire. I had 2 of these situations and the Martin Jerry refuses to be "off". You're better off using 2 dumb switches and a shelly 1.Moreover: an old review of these mentioned how you could make the LED do what you want. Well not anymore. Green = "I'M ON", Red = "not connected". The tasmota config doesn't give you any options, just dumps into a "Tuya" circuit. It's a bit sad really as I don't need the switch to tell me the lights are on most of the time.For me it's about 50/50 with these 3-ways: Two installations are working PERFECTLY, Two would not report the correct switch state regardless of how it was hooked up.

This 3 way switch has feedback to know when the output is on or off. This sounds like an "of course it should" until you start thinking about how to actually implement it electrically. I was expecting just a dumb relay output but no, this is a proper smart device with feedback. It can be wired at either end of the 3 way chain, either at the beginning with the common being the unswitched feed or at the end where the common feeds the load. Yes, it will power off the travelers. It also detects whether the device is on or off in either configuration. This appears to be a voltage based detection, it relies on the load pulling the output low to detect power state. If there is no load it sticks in a "on" state. Which might be a problem, but also means this can indirectly tell when there is a open circuit or a burned out bulb: If the power state is commanded to toggle but the detected state doesn't then there is a fault.This is a TuyaMCU based implementation, so there is a Tyua chip in here doing the actual device IO. This also means the switch is responsive, as the ESP MCU is not in the mix. It has a green LED that lights up when the output is on, driven by the TuyaMCU. Unfortunately that means reprogramming the IO isn't as easy as adding a new Tasmota Template, but if that's the worst downfall I'll take it. If the load is open circuit the green LED in the unit sticks on.I did disassemble this and take a close look at the relay board, as I saw the hints that it did power detection. The build quality is good, on par with in-wall modules I bught at the local big-box store. I was also impressed that the relay is a 16A DPDT relay with the two sets of contacts paralleled. This is likely a value engineering item, as DPDT relays are likely cheaper in the dimensions needed for this use, which is a value engineering item in the good direction which we don't see often these days. I didn't remove the switch board but it looks similar to the Martin Jerry single pole unit, which used a proper microswitch for the main switch and not a cheap PCB switch. This one has the same tactile feel.I said this on the single pole switch and I'll comment again here, the feel of this switch is very different than a normal switch: You're clicking a microswitch not toggling a real power switch. Another reviewer referred to "passing the wife test" and that's a fair concern. It feels more like a computer mouse than a wall switch. This is also a fairly chunky unit, by necessity, so it will need some decent room in the electrical box. HOWEVER, if these are concerns and you have the ability to add another electrical box this unit can give you the best of all worlds. Add a oversized box, like a 4 square (these work fine in 4 square steel boxes with a plastic wallplate, got 2 of them installed this way) somewhere out of the way and install this in it. Upgrade your two way switch to a 3 way switch, or the 3 way switch to a 4 way, and now you still have the normal, tactile feedback, normal switch operation, and the automation benefits. The state feedback and ability to work at either end of the chain allows this. Best of all worlds, if you can add a box and pull some wire.No internet needed for this, just DHCP. NTP isn't required but you'll want it, with NTP it's a self-setting timer as well. Tasmota firmware works out of the box. It does need a neutral wire no matter what. Same complaint I had about the single pole units with the plastic ears, it's the same housing, but so far that hasn't been an actual problem.Full 5/5 stars, I'm genuinely impressed that the output state is known regardless of configuration.

I've been doing home automation for about 3 years. I spent a whole saturday wiring up a 3-way switch with a Shelly. I am kicking myself for how much time I wasted on other solutions. If you can install ANY light switch, you can install this switch. This Martin Jerry switch was super easy to install.There is a noticeable lag between pressing the switch and when the light turns on. I mean, it's almost instant, but it's not instant. Likewise I think the fit and finish on these looks a little cheap. They don't look upscale or fancy.Having said all that, if you're an amateur and you're just getting started, the whole Martin Jerry line is the easiest thing I have ever used. Tasmota puts YOU in control, and Martin Jerry is doing the hard part for you: putting Tasmota on the device before you get it.

These are TUYA devices. so very limited compared to other Tasmota 3-way switches such as Treatlife. With regular Tasmota switches all features are directly implemented on the ESP8266, so it has full control over what happens when the switch is pressed, the switch can be "disconnected" from the relay and only connected via software if you want, the power state monitoring is reported separately from the relay/switch, you can control the LED behavior through software, etc. This even allows you to use a 3-way switch in a regular 1-way application if you need e.g. you've run out of the right spare parts.Unfortunately, these devices use a separate Tuya microcontroller for the switch, relay, and LEDs, using the ESP just for WiFi interface, so there is very little control. They only work correctly in a 3-way setup, because their behavior can't be changed. You have to connect the switch to the 3-way wiring for it to work right; if you only connect live/neutral/ground and no travelers, then every time you press the button or send MQTT commands, the relay will switch then immediately switch back. Regular Tasmota switches work fine "out of circuit" for testing and initial setup.The only advantage that these switches have is that they're pre-programmed with Tasmota, so you don't have to take them apart, solder wires, and reflash them like you do with other smart switches. I'm not convinced that is worth it, especially given these are more expensive than Treatlife switches.

This is a great smart switch that really works.