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InfluxDB
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Here's a random proof-of-concept I threw together a while ago for super precise ultrasonic wind speed measurement (or very short distances) - it uses the analog comparator plugged into timer input compare for phase analysis, which is where the precision comes from.
I've encountered plenty of folk that'd like to read a servo PWM signal and generate motor drive PWM at the same time in a less janky way than pulseIn (which blocks on no signal and is affected by interrupt latency) and analogWrite (which uses a super low PWM freq by default)