0
ScottF on Apr 11,2017
I wish to mount this PIR sensor outside in a waterproof box. Can you please advise what kind of material
can be used to cover the sensor that doesnt interfere with the passive infrared and is still suitable for
outside (i.e. waterproof and U.V. light stable).
0
Osman Da? on Mar 20,2017
Hi this pcb nin there is a friend who has a drawing pc too?
0
on Oct 19,2016
Hi, if I implement this PIR sensor on the car that will move around, will the sensor sense the movement of
the car without any human here?
0
Richard Conley on Oct 19,2016
Is this usable outdoors? I'm worried specifically about rainwater.
William Brohinsky on Jun 20,2017 23:20 PM
It is an IR sensor. To be able to get a meaningful signal, it must be placed where the background IR is low enough
that it doesn't trigger the sensor board (or the optional resistors and pots must be attached and they must be
adjusted to reduce the sensor's sensitivity below the background level.To test the sensor, connect and power it,
read it out. It will probably be responding to your body, your computers, etc. Place a blanket in the freezer for 15
minutes, then wrap the sensor in it and place an inverted (empty) drawer over the wrapped sensor. This should
produce a low signal. (You could also just stuff the sensor in the freezer and shut the door!) If you don't get a low
signal, check your wiring!Once you've achieved a low (indicating that it is not "seeing" enough IR to trigger the
output) you can expose it to more light or a warm body, and it should respond.PIR sensors are used indoors,
usually in unoccupied rooms, so that, when a person enters, it will see they are present by the IR (light emitted
from their bodies by body heat) and turn on lights. Simulate this environment to test it.
Reply
upvote (0)
Reply
upvote (0)
ae on Apr 14,2017 10:44 AM
Any transparent material, Thanks.
Reply
upvote (0)
Reply
upvote (0)
ae on Apr 14,2017 16:33 PM
Hello, I am sorry but I don't quite understand your question.
Please contact techsupport@seeed.cc with your set up, the code you’re using, and any errors you might be
getting.
Thanks.
Reply
upvote (0)
Reply
upvote (0)
William Brohinsky on Jun 20,2017 23:13 PM
This is a PIR sensor. It indicates the Presence of IR (Infrared light). It has settings that can be controlled, to make it
more sensitive or less sensitive, but it doesn't differentiate anything but the amount of IR within it's "View". This
view is a 120-degree cone which has its point at the center of the white 'dome', and extends from the board on the
dome side. All sources of IR within that cone will be focused onto the element in the sensor, and will be summed
(contributing by the square law: double the distance, the received IR will be cut in half.)The sensor board can be
adjusted for sensitivity, which allows some compensation for IR sources in the background. However, that
assumes the IR sources are not changing, and aren't moving around. The sensor integrates the heat from the
entire surface (visible to the sensor) along with every other heat source to produce the analog signal, which is run
through a comparator to provide the output signal. That means the entrance of two large dogs could be
'recognized' as the entrance of a single human. Also, if an IR source is brought into the view, the sensor would
always indicate a presence, regardless of how many people came or went.Basically, because of the need to control
the environment, the PIR sensor is meant for use indoors. It is easily fooled, even then, by a heating
register/radiator, hot plate, electric kettle, etc. Likewise, it doesn't have a mechanism to recognize the entrance of
more than one person.Placing a PIR sensor on a car will expose it to many IR emittors: People, animals, car engines
and exhaust systems, the Sun's rays (which carry considerable IR), Industry, trains... and it will be difficult to sense
any single thing or person. Additionally, if you set it so it can recognize the presence of one human added to the IR
flux from the sun at noon, a cloud will easily drop the background IR flux so adding a human to the scene will not
trigger the sensor...In short, whatever you want to use an IR sensor for on a car is unlikely to work, and another
sensor type should be considered.
Reply
upvote (0)
Reply
upvote (0)
Jacket Chen on Oct 20,2016 10:44 AM
Hi Richard.Yu can use it outdoors,but take some measures to prevent water is unavoidable.
Reply
upvote (0)