IRA-S210ST01 PIR sensor

Projects General Guidance
1

Hi

I am playing about with a IRA-S210ST01 PIR sensor.

I was hoping this would connect directly to a processor (with a few setup component).

But, seem to do nothing. I am guessing the output is so small, that I need to amplify it?
The test setup on the page above just shows a 47k pulldown and a 22uf going to an amplifier to test on an oscilloscope.

So... I need an amp etc

https://www.farnell.com/datasheets/2199767.pdf

So, can someone tell me the difference between the demo circuits 'Source voltage' and 'White noise'?

Don't have any LM224 OP-Amps here, but I do have a pile of LM324's

2

Made the source voltage circuit with an LM358. I see no change in output at all on my multimeter (don't have a scope).
Would have expected to see at least some change

3

Clearly wrong!

Source voltage
Source voltage548×323 11.9 KB

4

Did you use a Fresnel lens.
Leo..

5

You won't. You need a scope.

Don't have any LM224 OP-Amps here, but I do have a pile of LM324's

Basically the same.

6

Yes. I have a Fresnel lens on it.
How can I get an output from this PIR that I can feed into a processor?

I understood from research (now looking incorrect) that the output needed minimal processing (unlike other PIR sensors)

I thought an LM358 would have worked.

Oh well

7

see post #5

8

Use the circuit in the datasheet.

9

Brilliant

aazAp
aazAp1474×626 104 KB

I'll try this one

10

The signal at the point with the red arrow will still be very small, maybe a couple of hundred millivolts with a DC offset.

11

A HCSR501 PIR sensor modele is cheap, has the same sensor in it with a special BISS0001 chip.
Why build it yourself.
Leo..

12

Because its going on a bespoke PCB... no room for a larger PIR module

13

The AM312 is smaller.
Leo..