Electronics > Projects, Designs, and Technical Stuff

Help reusing a PIR sensor

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Evangelopoulos Panagiotis:

--- Quote from: RoGeorge on March 10, 2020, 07:56:12 pm ---In the example from the datasheet, the analog signal you want can be found at pin 7 of the second LM324 op-amp.  Everithing on that schematic on the right handside is just to trigger the relay.  Chances are you already have that exact schematic already made on the backside on the PCB.

Put a picture of the backside, should be easy to identify the chips, starting from the power and GND connections of each chip.

A PIR analog output can also be found right after C5, just that it will be much smaller.

--- End quote ---



--- Quote from: Zero999 on March 10, 2020, 08:25:34 pm ---The circuit isn't that complicated. Just break it down into several parts.

--- End quote ---


Awesome! Thank you very much both of you!

I would try to probe the PCB and tap on the analog out with a wire but stupid me took the lazy way around and removed the PIR sensor with a blob of solder to heat all pins concurrently which destroyed the PCB.  |O  :palm:

Plus I believe I somehow damaged my PIR sensor.... Anyway, I shall pause my experimentation here and continue once I get a new sensor on my hands.
If and when I get it going I'll post a few pictures here.

Thank you for your time and effort,
Have a nice evening,
E.P.

RoGeorge:
PIR sensors are very easy to damage during soldering.  They are very, very sensitive to overheating, even more sensitive than electret microphones.  Usually it is mentioned in the datasheet, too.

However, the one you have might not be completely dead, maybe it's still working but with a lower sensibility.

Good luck anyway!   :-+

StillTrying:

--- Quote from: EvangelopoulosPanagiotis on March 10, 2020, 02:13:33 pm ---I was in the mood of making a some kind of meter to detect changes of temperature in a room.
--- End quote ---

The sensor part is in two halves and detects a change between the two halves such as a person walking past it, but it rejects temperature changes that effect both halves, so I don't think you could use it to do that.

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