Hello. I have a couple of these pir modules but the delay time is not very long.
One is about 2mins 30s & the other is just short of 3mins. The data sheet says that it can be adjusted to about 5mins and that would be fine, but mine are falling short of that time.
Is there anyway I can modify the sensor? maybe by changing capacitor or resistor values?.
I have attached the data sheet
Thank you very much. John...

 

Yes, increase the RT 1Meg preset or the capacitor CY1 100nF, to increase the delay time.

 

Yes, increase the RT 1Meg preset or the capacitor CY1 100nF, to increase the delay time.

Hi Dave, thanks for the quick reply.
The RT 1Meg preset, is that the time delay adjust pot? and what should I change it too?
I can see the CY1 - 103 on the data sheet but I am not very good with schematics, is it one of the 4 large capacitors and if so which one is it and what value should I replace it with?
Thank you very much. John...

 

Hi Dave, thanks for the quick reply.
The RT 1Meg preset, is that the time delay adjust pot? and what should I change it too?
I can see the CY1 - 103 on the data sheet but I am not very good with schematics, is it one of the 4 large capacitors and if so which one is it and what value should I replace it with?
Thank you very much. John...

I believe CY1 is the red outlined one as shown below.
You will need to at least double its value to get your desired time delay so 22nF to 47nF should do nicely.

 

Hi Dave, thanks for the quick reply.
The RT 1Meg preset, is that the time delay adjust pot? and what should I change it too?
I can see the CY1 - 103 on the data sheet but I am not very good with schematics, is it one of the 4 large capacitors and if so which one is it and what value should I replace it with?
Thank you very much. John...

If you want to double your time delay, then change the preset resistor to 2.2Meg,.

 

It will be easier to find a physical match for the capacitor.

 

I believe CY1 is the red outlined one as shown below.
You will need to at least double its value to get your desired time delay so 22nF to 47nF should do nicely.
View attachment 133459

Ok, thank you very much....

 

If you want to double your time delay, then change the preset resistor to 2.2Meg,.

Ok, thank you very much Dave....

 

It will be easier to find a physical match for the capacitor.

.Thank you very much Alberthall....