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Code To Turn Controller Off

Has anyone written code to turn microprocessor off?

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#8   — Edited
Let me get this straight. I will use the usb output to plug in what and how will it communicate with the robots new power relay. 

I am excited about this idea. Thanks DJ for helping.

Did this get posted.  Sent it out yesterday
#9   — Edited
How about using a smart switch that hooks into your wifi? A lot of them have apps you can have on your phone that will let you remotely switch power on and off. A lot of them also will allow you to use Alexa and turn it on and off with your voice. Of course thie would only work with 110vac. If your robot is powered from DC batteries You would still need a relay to put between the power switch and the robot.

Wifi Outdoor Smart Outlet Plug, Benuo Wireless Smart Plug Waterproof Outlet Socket with Timer, Works with Alexa and Google Home for Voice Control, Wifi Enable Smartphone APP Control from Anywhere
Thanks I am looking into it.  I will let you know what I decided.
You can use an ATmega328P and a relay uses very low power and you can put it into sleep mode.
Adafruit also has a TPL5110 that you can set a timer and it will power on your device within a set period.
#12   — Edited
I'm sorry, it was not intended to be a sales ad. I thought I was giving an option to try.
That’s the most applicable spam I’ve ever seen on this forum. Im not even going to delete it because it actually could be used. Now, an iotiny with a solid state relay is cheaper and more customizable. But boy, that’s a great spammer!