status light - ideally battery operated

[thommango]

I'm creating an automation to turn off and on my modem whenever it loses connection with the provider. I'd like to have a little indicator light on my desk that would be on throughout the restart cycle so that I'm aware a restart is in progress. Is there simple status light device - ideally battery powered - that would do the trick. Yes, I know I could use a smart power outlet or perhaps smart bulb for this, but I'd rather not dedicate an outlet or lamp to the task. I'd prefer something very simple. If not available, perhaps I will trigger an sms message instead.

[rmasonjr]

The HomeSeer Flex Sensor
Z-Wave Smart Home Sensors – HomeSeer

It has a peel-and-stick sensor that you put over an indicator light. I'm in the process of using one to monitor the indicator light on a tankless water heater.

[randy]

I'm creating an automation to turn off and on my modem whenever it loses connection with the provider. I'd like to have a little indicator light on my desk that would be on throughout the restart cycle so that I'm aware a restart is in progress. Is their simple status light device - ideally battery powered - that would do the trick. Yes, I know I could use a smart power outlet or perhaps smart bulb for this, but rather not dedicate an outlet or lamp to the task. I'd prefer something very simple. If not available, perhaps I will trigger an sms message instead.

I don’t know of any packaged devices that can show a light when requested. I am running Gregg’s Arduino plugin. It would be very easy to use a NodeMCU board with a single LED for notification. I currently have 4 NodeMCU boards with 4-line displays. They give me key information on the system. I wrote a little about it here. You could easily put a single LED on one of the digital pins to use as an alert.

[ksum]

If doing the Arduino route, another option is something like a D1 Mini running Tasmota. I made something similar to send IR signals. One version is in the images below with the LED visible between the solder board and the mcu in the first image. Another has the IR LED on a wire so the D1 Mini could be hidden and the LED placed where needed. So Tasmota and MQTT or the Arduino Plugin, either of which would work with the unit below.

Battery operated may be an issue.