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Made a complete No solder step by step for the esp8266 and nodemcu to turn On your pc with amazon alexa echo dot ect.. Using a relay or wake on lan / wol.

There are other options to accomplish the same goal and probably easier as well,However i just wanted to share the way I did it.
update 2/7/2020
added Leonardo so you don' t need to run the windows software I made
https://youtu.be/yauRjrJ__KY

update may31/5/2019 ---Alexa Shut down pc with relay option
extra steps..go to control panel -Power options--
Choose what the power button do" , "when I press the power button" pick "shut down"
**warning** only do this if you trust your surroundings for voice control.


package links
Package Complete------180Mb includes arduino 1.8.2 https://drive.google.com/open?id=1Qm70g2BuD62VlWnRxtKHScjLeyUARyZx


Package Lite ----Does not include arduino 1.8.2 https://drive.google.com/open?id=1Sd6A1ieqctmsuS0G53miXcv9Rg-MEJv3



----links----
https://www.banggood.com/custlink/G3Gvc96TyJ //esp8266 with programmer

https://www.banggood.com/custlink/KvGGWIB1d8 //nodemcu

https://www.banggood.com/custlink/vKmKr941Ys //jumper wire

https://www.banggood.com/custlink/KKv3WIgTdT //3v low trigger relay





Notes.. Make sure if you created a folder on your desktop or where ever to name the folder something small example "Alexa" then extract my package within . if the file name gets too long you might run into lots of problems


you can Say.
Alexa turn on "bangs" Pc
Alexa turn on Pc
Alexa turn off "bangs" Pc
Alexa turn off Pc
Alexa Play "video"
Alexa Resume"video"
Alexa mute "video"
Alexa turn up volume by "30"
Alexa turn down volume by "70" volume control is windows master volume. "5-100" .......Replace the above "" with your own naming. ..

...In the video around the end i had some issues trying to get it to set the volume and stuff ..I found out i had so many things named "video" in alexa skills during my tests. I needed to delete them all. ...
..
.