How To Flash Shelly Relays With Tasmota Or ESPHome | Voltlog

High quality PCB Services https://pcbway.com Welcome to a new Voltlog, in this video I’m going to show how to flash your Shelly relay with Tasmota or ESPHome, the easy way, using the VoltLink USB to serial converter. What is a Shelly relay you might ask? Well, if you are into home automation, a shelly relay is a wifi connected smart relay, built into a very compact form factor in order to fit inside electrical junction boxes like behind wall switches or wall sockets.

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The manufacturer offers a pretty comprehensive app and cloud service as well as addons for integrating with HomeAssistant but you might feel like you like all of your devices to run Tasmota or ESPHome for some particular extra features or just general uniformity across you network so that it is easier to manage. Myself I prefer Tasmota and I won’t go into a discussion of Tasmota vs. ESPHome in this video, whichever you prefer, it’s fine, I’ll show you how to do it.

The first point on our list is going to be safety. Since shelly devices operate on mains voltages, it is very important to think about your safety when doing the programming procedure and generally when installing such a relay. Here for example I have a Shelly 2.5 but what I’m going to show you applies to most if not all of the models in their lineup.

Shelly devices have a power supply inside to step down the mains 240V to 3.3V needed to power the ESP8266 chip inside. That power supply is not galvanically isolated from the programming header, which means there is a risk of electrical shock or damage to equipment if you were to connect this to your computer, while the relay is connected to mains power. So as a first rule, never connect your shelly relay to a computer while it is mains powered.