I use the method outlined in this thread. Of all the methods I've used over the years this has been the easiest and most reliable. (vibration sensor batteries drain due to constant vibration, temperature sensors have a delay, contact sensors are ugly). This method triggers open/close on contact sensor as soon as my dryer starts and stops and is extremely reliable and hidden in the back. Installation was super easy. Took off hte back panel, put it around one of the legs of the power and put the panel back on.
This method can also be used to monitor status of other devices if needed.
I mentioned the parts I'm using in the last post.
