What you find with a washing machine is that it has soak cycles which means it is not a simple matter of ON/OFF to know when a load is finished. One can try to track the number of ON/OFF cycles to determine it. If you do not disturb a started load then a simple delay after the first ON can be used to know the load is finished.
What I think has been shown to be more effective is to monitor lamps on the washer that illuminate as each stage progresses. This is a photosensor extended from a hawkeye. Another is to monitor the position of the knob which is a magnet, reed switch and whatever you want to monitor contact closure such as DS10A, powerflash or whatever interface you have in the vacinity of the washing machine.
What I think has been shown to be more effective is to monitor lamps on the washer that illuminate as each stage progresses. This is a photosensor extended from a hawkeye. Another is to monitor the position of the knob which is a magnet, reed switch and whatever you want to monitor contact closure such as DS10A, powerflash or whatever interface you have in the vacinity of the washing machine.
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