I have a PIR sensor that I wish to trigger a circuit. Its really crappy, as the shortest "trigger on" pulse I can get with the On-Board controls, is 6 Seconds.
I need instead for this to output a pulse of 1 second (approximately).

The unit outputs a 5v negative pulse when triggered. It can drive a led with a dropping resistor between its output wire and the positive supply line.
The unit is being powered by a 9v battery, and its on-board regulator then steps it down to 5v using a Zener. Its specs sy it can be powered from 6 to 40 VDC .
INFO: https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/connecting-to-a-pir

I need a shorter trigger time, for heavens sake!!

So does anyone have a circuit that can use this?

Thank you in advance for any help you may give..
Kim (P.S. Im a Guy)

 

Kim (P.S. Im a Guy)

LOL

I have a PIR sensor that I wish to trigger a circuit.

Link to this PIR?

 

LOL

Link to this PIR?

Thank you Sir, DONE!!

 

Hi kim.
A circuit diagram.
RT1 ,CY1 circuit
E

Added a PDF

 

Hi kim.
A circuit diagram.
RT1 ,CY1 circuit
E
View attachment 359092

Wow!!....I am not familiar with these I.Cs, I will have to look them up. What is the jumper used for??

 

hi kim,
Read this PDF clip.
Triggered in two ways: (jumper selectable)
◦ non-repeatable trigger: the sensor output high, the delay time is over, the output is automatically changed from high level to low level;
◦ repeatable trigger: the sensor output high, the delay period, if there is human activity in its sensing range, the output will always remain
high until the people left after the delay will be high level goes low (sensor module detects a time delay period will be automatically
extended every human activity, and the starting point for the delay time to the last event of the time)

Reduce the value of CY1 cap to say 102

Added layout.

 

Wow!!....I am not familiar with these I.Cs, I will have to look them up. What is the jumper used for??

Hi kim.
A circuit diagram.
RT1 ,CY1 circuit
E

Added a PDF
View attachment 359092

Actually, after looking it up, all this circuitry is actually on-board on this PIR for all of this to provide the output, and delays

 

Hi kim
It is a PIR module with all the required components, trace the circuit copper track from pin #4 of the IC to locate the CY1 capacitor.
E

 

hi kim.
This PDF explains the operation and timing of the module.
E

 

I need a shorter trigger time, for heavens sake!!
So does anyone have a circuit that can use this?

If you can't modify the PIR module use this circuit.

 

If you can't modify the PIR module use this circuit.
View attachment 359112

Thank you very much Mr. Sghioto, once again

 

hi kim,
If you have the PIR module, have you identified CY1 , C6 capacitor on the PCB?
E

 

hi kim,
If you have the PIR module, have you identified CY1 , C6 capacitor on the PCB?
E

THERE ARE NO COMPONENTS WITH THIS DESIGNATION, AND i HAVNT HAD THE TIME TO IDENTIFY THEM MYSELF
(SORRY Caps Lk.). Im going to go with the external circuit Mr. Sghioto has provided.

 

Im going to go with the external circuit Mr. Sghioto has provided.

With nothing connected to the PIR output what does the voltage read if any when activated and not activated?
Might need to edit my circuit.

 

hi kim,
OK,
For reference, this is the capacitor
E

 

hi sgh,
For reference the PIR Vout range is only 3V, from a 1k Zout.

E

 

hi sgh,
For reference the PIR Vout range is only 3V, from a 1k Zout.

E

Hi Eric,
According to post #1:
"The unit outputs a 5v negative pulse when triggered. It can drive a led with a dropping resistor between its output wire and the positive supply line".
I'm assuming it has an open collector output but some versions have an onboard pullup resistor.

 

hi sgh,
I have used a number of these PIR modules, I see only a 3Vout swing.

E

Added:

With nothing connected to the PIR output what does the voltage read when not activated?

The Vout =0V when not activated.

 

hi sgh,
I have used a number of these PIR modules, I see only a 3Vout swing.
E

Correct, as the one I have has a 3 volt output.
However the link in post #1 explains a possible different model.

"Most PIR modules have a 3-pin connection at the side or bottom. The pinout may vary between modules so triple-check the pinout! It's often silkscreened on right next to the connection (at least, ours is!) One pin will be ground, another will be signal and the final one will be power. Power is usually 3-5VDC input but may be as high as 12V. Sometimes larger modules don't have direct output and instead just operate a relay in which case there is ground, power and the two switch connections.

The output of some relays may be 'open collector' - that means it requires a pullup resistor. If you're not getting a variable output be sure to try attaching a 10K pullup between the signal and power pins".

Trying to get verification from the TS on this.

 

With nothing connected to the PIR output what does the voltage read when not activated?
Might need to edit my circuit.

It actually has zero volts when not activated