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HC-SR04 Ultrasonic Sensor
HC-SR04 Ultrasonic Sensor
The HC‑SR04 ultrasonic sensor is the goofy-looking part of my garage door opener, but it worked surprisingly well. I used it to measure distance to the door and then turned that into an open/closed state in ESPHome with a little logic.
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Pros
- +Cheap and easy way to measure distance
- +Worked well for detecting garage door position in my setup
- +Pairs nicely with ESPHome sensors and templates
Cons
- -Mounting/alignment matters a lot
- -Environmental changes (like temperature) could require tweaking thresholds
