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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So, battery should hold for months & you have to measure 1/hour the most. 3 months=2000h, 18650 cell is 2Ah -> 2mA average. Should work out.
1mA of course ;-)
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