Re: Radar Doppler Shift Motion Detector
Posted: Sun Jun 18, 2017 3:13 pm
I tried the rain experiment for you, but it didn't detect a shower of water drops... presumably not a large enough body of water to cause sufficient doppler-shift reflection.
Bear in mind that it doesn't detect anything absolutely (ie: a stationary train would not trigger it), it merely detects the slight relative difference in doppler effect caused by a radar-reflective moving body.
So in theory if you moved slowly enough you might even be able to defeat it, but in practice I doubt you could traverse it's entire 'field of vision' so imperceptively slowly, especially as it can sense movement from any direction - front, back, over, under, side edge, end edge... I haven't had opportunity to do relative directional sensitivity tests yet, but it doesn't appear to have any actual blind spots, and is remarkably all-around aware.
I have a unit running on my desk I'm developing a program on, and I've noticed it sometimes triggers just from chest movements of breathing, and I've even amused myself by trying to lift a finger without it noticing, but unless done very slowly it detects it every time.
Bear in mind that it doesn't detect anything absolutely (ie: a stationary train would not trigger it), it merely detects the slight relative difference in doppler effect caused by a radar-reflective moving body.
So in theory if you moved slowly enough you might even be able to defeat it, but in practice I doubt you could traverse it's entire 'field of vision' so imperceptively slowly, especially as it can sense movement from any direction - front, back, over, under, side edge, end edge... I haven't had opportunity to do relative directional sensitivity tests yet, but it doesn't appear to have any actual blind spots, and is remarkably all-around aware.
I have a unit running on my desk I'm developing a program on, and I've noticed it sometimes triggers just from chest movements of breathing, and I've even amused myself by trying to lift a finger without it noticing, but unless done very slowly it detects it every time.