Interesting, never heard about 230V sockets in the U.S. My washing machine and dryer both consume 2300 Watts peak, so in Europe this translates to 10 Ampere. So there is no difference in the electrical plug.
You could use a current sensor, like https://esphome.io/components/sensor/pzemac.html or https://esphome.io/components/sensor/ct_clamp.html
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You could also attach a $0.95 photo-resistor on top off a LED/light of the dryer that indicates if it is running or not.
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Kinda late to the discussion but I just installed a temp/humidity sensor on mine over the weekend and made a YouTube video about it. Just incase it helps someone else.
Make a Dumb Dryer Smart in Home Assistant!!
I decided monitoring the moisture was a better approach for my situation since my dryer time seems pretty inconsistent and either leaves clothes damp or cooks them. I think this method should save me some electricity also.
Good luck with your projects!!!
Jake Bauer
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Jake, I like you take on this: measure what you really want to know, i.e. are the clothes dry? I think I have all the parts here in my boxes, I think I have a new weekend project!
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It is a great idea.
I can imagine that the Humidity could be used as secondary information to the current measurement or motion monitoring to indicate something like
- "Your dryer ended but your clothes are not dry yet, give it a few more minutes"
I will try to add the DHT22 to my existing sw-420 to extend the automation logic.
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Ive also got the TPlink energy plug reader/sensor. I had my config setup like this (im a newb!)
But im getting random notifcations at odd times of the day when the dryer isnt running and I cant figure out why. I was hoping to tighten up my code and make it more strict.
Only problem is the dryer drops to 2.6W momentarily during its cycle to change its rotation of spin but sits at 1800W normally.
I have it currently send a notification simply once its been under 1.0W for 10 seconds but was thinking of maybe adding an IF statement somewhere to say if its been over 1000W for 10 seconds and then goes under 1.0W for 10 seconds THEN fire off a notification? Just got no idea how to write that 
- alias: "Notify when dryer is done"
trigger:
platform: numeric_state
entity_id: sensor.my_tp_switch_watts
below: 1.0
for: 00:00:10
action:
service: notify.PUSHOVER
data:
title: "Dryer done"
message: "Grab the clothes!"
Hi, I have just picked up two vibration sensors, one for dryer and one for washing machine. Can you share your code with me please so I can tweak it to suit my application?
For those struggling with this like I was, I found a related post that solved my issues! Between the blue print and the idea to attach the sensor to the dryer drum it totally works now.
Thank you @rod_poplarchick !!
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good job figuring this out, seems like it will work great
I went down a similar path, using the SW-420. Thought Iād share photos of a slight āupgradeā - itās now a $5 sensor including the housing 
. ESP-01, carrier board, SW-420, Tic-Tac container, small piece of foam to hold the boards in place.
Going to mount to the side of my dryer with velcro tape.
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Is there a way to get something like this made and flashed already? Iām in way over my head here. I did finally get my preflashed s31 connected to my first homeassistant installation on my synology nas and think I have it configured to tell me when the washer power drops below 10 wattsā¦running my first load of laundry now to see if it will work and trigger my sonos speakers in the kitchen.
I actually canāt believe I got this far but man I need help!
Yes you can buy vibration sensors.