Beiträge von marcvl

Hi:

Trying to get a new Shelly Uni working. When I connect the Shelly to a 12V power supply, the red light flashes once and then stays dark. The Uni is not creating its own WiFi network. Any ideas what might be wrong?

Marc

Just to close this topic. I did flash my Shelly devices with ESPHome and I've been very happy with the MQTT support. The Shelly devices are auto-discovered by HA (without the need for any special script), and you have full control over the topic structure through your ESPHome YAML configuration.

In order to enable MQTT auto-discovery of Shelly in HA, you need to install this script: https://community.home-assistant.io/t/shellies-discovery-script/94048

It's a bit of pain. Like you, I also decided to flash my Shelly devices. I went the ESPHome route. Once you enable MQTT in ESPHome your devices show up automatically (without the need for any additional script). I find this to be much easier (and much more flexible) than Shelly's MQTT implementation.

Yes, you can definitely do that using Shelly's Device to Device communication protocol (see https://shelly.cloud/documents/deve…mmunication.pdf).

Alternatively, you can use MQTT and an MQTT broker (like Mosquitto) to accomplish this. This allows you to be vendor neutral and establish device to device communication between devices from different companies. I have many different Shelly devices (and others); they all run ESPHome with MQTT. I have full flexibility to design any communication between them in any way I want.

Inputs are on GPIO 12 and 13

Yes, Shelly 1 can accept 12V, but it's REGULATED 12V. The power supply in motorhome will vary between 12V and 14V depending on the state of charge of the batteries and Shelly 1 will not like that.

The workaround is to install a DC voltage regulator so that anything downstream of that is 12V, irrespective of the battery charge.

Yes, you can always accomplish this with calling the API directly, but I'm trying to avoid that. I want to standardize all device communication (not just between Shellies, but also with others like Sonoff) on MQTT.

After more research I think the best way to accomplish device to device communication over MQTT, is to flash the Shelly devices with ESPHome and then configure MQTT topics in YAML.

Hi:

Is there a way to customize the topics that Shelly devices subscribe to or listen to? I have 2 shelly devices, one acting as a switch, and one acting as a relay. I'd like for them to communicate over MQTT without having to write an automation script or using any other 3rd party software (other than Mosquitto)

Thanks,
Marc

I'm planning on automating everything that has a switch, including lights, doorbell, starting the generator, turning on the water pump, etc.

The UNI is not the problem. The problem is the relay. As far as I can tell, UNI is the only Shelly device that can be powered by an unregulated 12V source. But the UNI relay cannot directly switch on lights, etc because of the amp limitations. No other Shelly relay runs on unregulated 12V. Hence I'm stuck.

Hi.

That makes sense. Since the Uni can't really be used as a relay for lights, you need another Shelly device (1, 1L, etc.) to accomplish this. The challenge is that none of the other Shelly devices support flexible input voltage.

So I don't really understand how Shelly can be used for automation in a motorhome context (as they claim on their website).

The Uni is specifically positioned as 'adventure-friendly', allowing you to monitor and control a camper. I'm interested in using Shelly to fully automate all functions of my Motorhome, but I'm struggling to figure out how to do that.

1/ Shelly Uni can't really control lights (or any other appliance) directly, since the output currents are limited to 100mA. So, I'm assuming the Uni should be used to digitize analogue switches, correct?

2/ If so, what Shelly product do I use to switch on/off any 12V battery powered RV appliance (lights, door locks, etc.). My understanding is that all other Shelly products that support low voltage, need a stabilized 12V power source, which is not available in an RV.

It would be great if someone could explain end-to-end how to enable 12V light control in a camper using Shelly products