Low power Ultrasonic range-finder:
- CS-100 based HC-SR04 (3.3V)
- NewPing with modification to support ATTiny1614
- BSS84 MOSFET to switch on HC-SR04 (inverse), or power directly off GPIO
- 20uA background =
- 3mA for ~150ms every 10 mins = 0.45mAs
HC-SR04
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