Grove - PIR Motion Sensor

Products & Technology Grove
#1

Hi,



May I check are there any updates with regards to Measuring Range and the default detecting distance of Grove - PIR Motion Sensor?



Could you please elaborate how the Measuring Range and the default detecting distance of Grove - PIR Motion Sensor is calculated and intended to work in detail?



Please provide a diagram to explain the default detecting distance is 3m…is its line of sight vertical or horizontal distance from the placement of Grove - PIR Motion Sensor?



Looking forward to your reply.





Thank you.

#2

Hi there,


For the default, it means that you receive the board and without any rework. the detect range is 3m. R13 is 2Mohm.

For the max 6 meters, you can rework the board and add the R2 (10Mohm)adjustable resistor. The detecting distance can be adjusted from 6 meters to only several centimeters. You have to remove R13 if you add the R2.


Thanks

best rgds
Bill
#3

Hi,



Please provide a diagram to explain the default detecting distance is 3m…is its line of sight vertical or horizontal distance from the placement of Grove - PIR Motion Sensor?



Thank you.

#4

Hi there,


The 3M is the experiment data. There is no calculation. It depends on the resistant R2(Between 2IN- and 2OUT pins of the TM2292). For the schematic, you can refer to attachment. For the TM2292 datasheet, we only have the Chinese version. Please see the attachment as well.

Thanks

best rgds
Bill
#5

Can you suggest any adjustable resistor R2 model suitable for this board (Grove PIR Motion Sensor) ?
Thanks !

#6

Here in the wiki it says
“R2: used to adjust the detecting distance(the AMP coefficient, 2MΩ). R6: used to adjust the holding time(the trigger duty, 100KΩ).”
A 2M ohm variable pot should work.
You can also try the generic HC-SR501 instead

It is used in many home automation projects like this:

#7

Hi,
Yes, I’ve seen this information, but my question was regarding the type of variable resistor I had to use. I’ve already found the type to use, Bourns 3314J-1-205E - 4mm SMD Horizontal Trimmer Potentiometer.
I need to use a small PIR, and the GROOVE one is perfect for me.
Thanks !