Comments: Blynk Board Washer/Dryer Alarm
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This is very cool, but it seems that power usage will be very high. I can't believe that a 850mAh battery would last more than 2-3 wash cycles given that you have wifi enabled during the entire wash and you are continually sending data to the Blynk API. Also, it seems you would need to physically disconnect the battery to stop it draining power in between washes.
I did not see this tutorial before making my own accelerometer based washing machine sensor which works in a similar way but will be much lower power. My sensor will last about 2-3 months before recharging. See the project I made here: https://www.instructables.com/id/Washing-Machine-Notification-Sensor/