I fixed my garage's most annoying problem with a $20 sensor

I could never remember whether I'd closed the garage door. I'd back the 4Runner down the driveway, get half a mile down the road, and the doubt would start. A few mornings a year I'd walk out to find it had been up all night, with January air pouring into the attached garage and creeping toward the house. Yelling at Alexa never solved the real...

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