The first thing that comes to mind is the ST multipurpose sensor. It's an open/close sensor with vibration. They're usually around for about $20 as Amazon lightning deals or warehouse deals. https://www.amazon.com/Samsung-SmartThings-F-MLT-US-2-Multipurpose-Sensor/dp/B0118RQW3W
$60.00 form amazon.ca. Still a little pricey, but less than $80.....
Probably this at $20. It's Z-Wave compatible. You'll need a controller if you don't already have one, but Z-Wave is compatible with IFTTT.
Try Samsung SmartThings, get a hub and a multi-purpose sensor, you simply attach it to your garage door and it can sense when the door is open or closed via its orientation and angle sensors. I have mine setup in the app to send me a text if the door is open for more than 60 minutes. It keeps a complete log of opening and closing and can also tell you the garage temperature. Through IFTTT you can do pretty much anything with it including automatically closing the garage door if your opener supports it, flash your Hue lights inside, etc.
Samsung SmartThings Multipurpose Sensor - $30
Samsung SmartThings Motion Sensor - $30
The lowest price ever offered on Amazon according to Camel3x.
Amazon has SmartThings Motion sensors for $39 and Multipurpose Sensors for $20. https://www.amazon.com/dp/B0118RQW3W/ref=cm_sw_r_cp_api_cApgAbYE481TA
They also have Sengled Smart Bulbs Dimmable Bulbs for about $10: https://www.amazon.com/dp/B072M5RT6L/ref=cm_sw_r_cp_api_RxpgAbH46K2J7
Wink has their Relay touch screen for $29: https://www.wink.com/products/wink-relay-touchscreen-controller/
Mine was cheaper because I bought my hub and a bunch of sensors as a kit, used.
But, something like this mulitpurpose sensor and this smart outlet.
I have all of my automations run through webcore so that's what I used.
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>Brainstorming Ideas: Based on a bedrooms temperature -> Turn on/off the smart plug (connected to a window fam).
Perhaps compare inside temp to outside temp, and if former is higher and latter is greater than 60 (or whatever), turn on...? (That is, if it's hoter inside than outside, but not fricken freezing, then turn on.) Great idea, and you could get pretty fancy with it.
>I have an extra android smartphone I would be willing to leave plugged in and in the room to be a permanent thermometer for that sensor.
Temp sensors can be had for less than $20, depending on your home automation system (see below).
>So I'm open to using a product like IFTTT or another IoT product that will link my smart switch to a thermostat sensor (prefer an app on an android device but who knows). (quoted from here)
I'm sure it could be done using Arduino or a Pi system, but I haven't dived in that deep. This could be done with a SmartThings or Hubitat with one of these. I'm pretty sure with either SmartThings or Hubitat you could also compare to outside temp. However, before you commit, double check on the sensor (let me know, and I can double-check for you... there's two different types of these sensors, and I think I've read that one doesn't do well).
edit: Personally, I avoid WiFi devices, since it would clog up my network with a gazillion sensors, bulbs and switches. But, there are two schools of thought, where the other is that it doesn't matter at all. Still, I'd go with Zigbee or Zwave, which gives more flexibility in fulfilling any later genius home automation ideas you might have.
Also (assuming the window is functional) you could pair it with a door/window sensor, to only turn on if open. I use these, but there are cheaper options.
I was thinking of the Smartthings multipurpose sensor which is all wireless. Just stick it on the door and pair it to your hub.
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Is the standard multi-purpose sensor a sufficient sensor for this purpose? Thanks!
EDIT: Seems it is! I'll try it out.
the multisensors are on sale now and do temperature. I just installed one in my network closet to alert me when it gets too hot.