#define PPM_FrLen 27000 //22500 //set the PPM frame length in microseconds (1ms = 1000µs) #define PPM_PulseLen 400 //300 //set the pulse length //CH[2] = map(ppm.latestValidChannelValue(3, ...

Ultrasonics refers to signals that are above the human hearing span (>20 kHz), and usually in the 40- to 70-kHz range. These signals are used like radar—they’re radiated toward a target and reflected ...

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