Z wave dongle

[ritchierich (Michael)]

I don’t know of anything that exists. You could create your own by using a presence sensor where you remove the battery and hook up a step down converter to convert the USB 5v to 3v:

Make a battery powered sensor run on USB

I have a few sensors in locations near a receptacle but yet I continue to change batteries. Well no more! After reviewing several YouTube videos and doing a little research I found a small device a little smaller than a CR2 battery that converts 4-12V DC down to 3.3V DC which is the equivalent to 1 CR2 or 2 AAA batteries. I converted my first sensor today and thought I would share. Here is a good video tutorial. I ended up getting a slightly different power module than the one mentioned in the video since this one has a higher range of input voltage. Plus it is smaller in size too. This power supply module to down-convert the power: https://www.amazon.com/gp/product/B01CONBSV0/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 First I hooked up a few wires to the power module that I ho…

Then when the presence sensor turns on it will connect and be flagged as present and your garage can be set to open.

Another idea is they make very small wireless access points/routers such as:

WiFi Networking Equipment for Home & Business | TP-Link

This particular one runs from usb power so it will power up when your car turns on. Search this community for “wifi presence” and you will see several solutions for routers running AsusWrt or DDWrt where you can make a device present when it connect to to your Wifi network.