So sanity check for a potential project.
We have an old dishwasher at work, a GE QuietPower 3, and being a technology company, we want to connect it to our chat room to notify that the cycle is done, so someone can unload it.
The first iteration of the project we were just going to cover the "finished" indicator light with a photoresistor, so when it lights up, the microcontroller will know it is done.
However, that is not very nice looking, the second approach, after quickly looking at the technical maintenance manual. Is to literally solder the ground and + of the "finished" indicator light to a digital or analog pin, and the ground pin on the micro controller, so the results are more precise.
I suspect the LED is probably less than 12V, (will confirm with a multimeter). I will step it down to 5V.
Then it is just a matter of checking if the pin is high or not on the microcontroller, is this simple enough to solve the problem, or am I overlooking something obvious?