Data monitoring using Arduino

Hello,
I am working on aproject. I'm looking for ideas to develop a simple system based on Arduino that can monitor a manufacturing machine in real time (Just downtime and uptime states). How could I start ?
I will be grateful.

Start by finding a way to know the state of the productiom machine, running, or not running.

There is alrealy a two lights tower describing that running state. I though of a color sensor who will detect the two states !

You only need the running state as the opposite is non-running.

Careful. Manufacturing machines contract maintenance and warranty often demand no modifications which sometimes get translated to no-attached hardware.

Most industrial machines have wiring to an independent customer provided power panel; your shop electrician may be authorized to install a current sensing toroid or AC sensor to determine the machine state. You may also be able to use an ESP-CAM or Raspberry Pi Cam to visually monitor one/more status lights in near real time - from a distance.

Thank you very much.

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