Neeed some help with dual PIR sensor circuit

ericgibbs

Well-Known Member

Most Helpful Member

• Oct 23, 2013

• #21

hi,
I have added the relay 12V supply link, also shown an option for switching the 'high' side rather than 'low' side of the lights.

E

 

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whiteangel

New Member

• Oct 23, 2013

• #22

alec_t said:

The top end of the relay coil needs to be connected to the +12V rail.

Click to expand...

Isn't the coil being energized by the transistor. Why connect the other end to the +12 V?

 

Last edited: Oct 23, 2013

ericgibbs

Well-Known Member

Most Helpful Member

• Oct 23, 2013

• #23

The relay coil needs current flowing thru the coil to operate.

 

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RogerSLO

New Member

• Feb 15, 2017

• #24

Hello, guys...

I was looking for something like this, but only one sensor and one stripe.

Could one (whiteangel?) be so kind and write the final list of elements and possibly new sheme, if any changes in the final work, please?

Already have the sensor (HC-SR501) and stripes (5050 SMD RGB)

Thnx

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Feb 16, 2017

• #25

Welcome to the Forum... Firstly, hijacking isn't the best way to get help.. However! as whiteangel has never been back since... I'll let it lie...

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 16, 2017

• #26

hi Roger,
The circuit will be basically the same as post #23.
I will update an post
E

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 16, 2017

• #27

hi Roger,
Try this circuit, its for one PIR.
NOTE:
Set the 's' for sensitivity and 't' for the ON time of the PIR [ marked pots mounted on the PIR PCB]

Allow about 2 minutes settling time for the PIR after powering up.

E

 

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RogerSLO

New Member

• Feb 17, 2017

• #28

Sorry, Ian. I know hijacking is not good. Wont happen anymore.

Thank you Eric.
How many watts should resistors be?

R.

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 17, 2017

• #29

RogerSLO said:

Sorry, Ian. I know hijacking is not good. Wont happen anymore.

Thank you Eric.
How many watts should resistors be?
R.

Click to expand...

hi,
I would use 0.25W [ or higher if that's what you have]
E

 

RogerSLO

New Member

• Feb 17, 2017

• #30

Thank you again Eric

Let me try do it now.

R.

 

RogerSLO

New Member

• Feb 21, 2017

• #31

Hello.

I noticed that when HC-SR501 goes off, it has a delay to turn on again after 6-7 seconds. (wawing infront of the sensor)

Is it possible to modify HC-SR501 to switch on immediately when motion is detected (after it goes off at timer)

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 21, 2017

• #32

hi R,
That dead time after an active ON period is called the blockade time, which appears to be fixed.?

Would repeat triggering of the PIR be acceptable for your application.?
In other words the PIR output is High/On while movement is being detected.?

E

 

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Last edited: Feb 22, 2017

RogerSLO

New Member

• Feb 21, 2017

• #33

ericgibbs said:

Would repeat triggering of the PIR be acceptable for your application.?

Click to expand...

Hi, Eric.

I guess so.. it is ment to be for led lights in the bathroom. My wife always forget to switch off the lights

I would like to set the blockade time to minimum.
I tried rotating trimmers, but couldn't get it.

Thank you,
R.

 

RogerSLO

New Member

• Feb 21, 2017

• #34

I found it, thnx to you, Eric!

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 22, 2017

• #35

hi Roger,
The blockade' time as the spec describes it, is fixed.
Thanks for the video showing that modification for the 'blockade' time.

Pleased to hear its working.
E

 

RogerSLO

New Member

• Feb 22, 2017

• #36

hi Eric.

Thnx!

I was expecting a hack like this.

Now, when the timer goes off and when the motion is active, the light goes on immediately, ~0.1 sec (before 5-6 sec.)

The second idea was to put two sensors in parallel with slightly different timer delay.
That I will probably implement anyway, to cover more area. (There are shower doors, that could block the first sensor)

R.

 

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 22, 2017

• #37

hi,
You could add a second sensor by using the original dual PIR circuit, posted earlier.
Modify the 'blockage' time on the second sensor to suit the app.
E

EDIT:
Note the direction sensitivity.

 

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• Pir_circuit_4.jpg

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Last edited: Feb 22, 2017

RogerSLO

New Member

• Feb 22, 2017

• #38

Exactly.

R.

 

RogerSLO

New Member

• Feb 24, 2017

• #39

Hello Eric.

Thank you for clarification of direction sensor sensitivity.

If I want to use 5V input (for other project), what do I need to change in the circuit?
I already have 5V relay.

Edit:
Actually I connected as it is and it is working, but just want to be sure.


R.

 

Last edited: Feb 24, 2017

ericgibbs

Well-Known Member

Most Helpful Member

• Feb 25, 2017

• #40

hi Roger,
That PIR unit will work with a Vsupply of 5v thru 20v.
It has an board 3.3v regulator, so the output swing is always 0v to +3v
E