This is nice. ME007-ULS V1 ultrasonic distance sensor runs on 3.3V and outputs serial measurement. Super easy to control from ESP32.pic.twitter.com/nXzS5B6HzH
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But booting up, associating with the WiFi, taking the measurement, sending it out via MQTT takes about 5 seconds.
All depends on how often you measure and how much power is drained during sleep.
I'd like to do measurements at my heating, but I don't want to recharge batteries every week or so...
If you take a measurement every 10 minutes, a battery charge should last for months.
sounds like I can stick to the ESP :-)
Of course, you could as well look into a cheap 433MHz radio temperature sensor, an rtl-sdr and rtl_433 too. https://github.com/merbanan/rtl_433 …
I want to determine if the heating is on... Temperature would be an option. My first idea was detecting the burner's sound
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