hey, Im starting my first project and I'm want to build a moving detector that I will set abbove my shower and when someone will finish showering and go out it will allert and remember to this person to turn off the boiler.
my question is, is there any moving detector which is not a camera that I can attach to arduino uno?
Actually, in a damp room, a radar sensor would probably work better and can be put in a damp-proof housing. It will also "see" through the shower screen and detect movement better. Beware though, it sees through walls as well!
Actually, in a damp room, a radar sensor would probably work better and can be put in a damp-proof housing. It will also "see" through the shower screen and detect movement better. Beware though, it sees through walls as well!
I will look at this one as well..
thank you very much
Not radar, it's doppler based.
They work quite well, reaction time seems to be quite slow at about half a second. I need to play more with them to get a better feel for that.
Solder a resistor onto R-GN to reduce the detection range. It's omnidirectional. A pretty clever little device.
It may actually detect the movement of the falling water as well, anything that reflects the radiowaves is detected. When it measures a shift in frequency of the received reflections, that's movement.
Semantics. Most people will call it "Doppler radar" It is most certainly RAdio Detection, And Ranging is performed to an approximation.
wvmarle:
They work quite well, reaction time seems to be quite slow at about half a second.
As it must, since it is detecting beat frequencies of that order. Incidentally, an alternative way of conceptualising it rather than "Doppler" is to call it a standing wave detector. The detection time will correspond to how long it takes for the target to move a quarter of a wavelength.
wvmarle:
Solder a resistor onto R-GN to reduce the detection range. It's omnidirectional. A pretty clever little device.
Haven't played that much, need to do so soon as part of an important project, but logically placing a reflector (grid will suffice) behind it should sort out the directional bit nicely. Need to know the frequency; probably around 432 MHz.
These are quite ingenious devices, where a single transistor with a PCB inductor and a couple of capacitors acts as the transmitting oscillator and direct conversion receiving mixer/detector.
Might a flow detector be a simpler solution? When flow stops, and doesn't resume within X minutes (for the next shower), shut off the boiler?
If nothing else, a segment of PVC and a Hall effect sensor? (fix it so that it will fall with no flow, but be pulled near the edge when water is flowing)
wvmarle:
Not radar, it's doppler based.
They work quite well, reaction time seems to be quite slow at about half a second. I need to play more with them to get a better feel for that.
Solder a resistor onto R-GN to reduce the detection range. It's omnidirectional. A pretty clever little device.
It may actually detect the movement of the falling water as well, anything that reflects the radiowaves is detected. When it measures a shift in frequency of the received reflections, that's movement.
I just thought about it as well..it seems that the range of the detector is omnidirectional which is bad for me cause it will detect it anytime someone get inside the shower\toilet room.
I can't find this R-GN, what it's look like? any link for that?
royanc:
I just thought about it as well..it seems that the range of the detector is omnidirectional which is bad for me cause it will detect it anytime someone get inside the shower\toilet room.
And that is bad why? What difference would a PIR sensor be?
Put it in a utility box lined with foil on all but one side - must be mounted at least 15 mm from any part of the foil. At 3 GHz that will make it very directional.
Paul__B:
And that is bad why? What difference would a PIR sensor be?
Put it in a utility box lined with foil on all but one side - must be mounted at least 15 mm from any part of the foil. At 3 GHz that will make it very directional.