Pir sensor proxyimity alarm problem

Other Hardware Sensors
1

Dear arduino forum
My name is Jaap i am.new here on this forum.
I just started with arduino programming and in love it very much.

I am using a pir sensor HC-SR501 contected to my Arduino uno.

When it detects movememt it prints to the serial port something like hey i see you and it flashed a pin 13.

Now theres two buttons on it that 1 is for sensitivity and the other for time.

Now i am running into a bit of a problem where definantly need someone to help me out.

The sensor should only go of when it detects a heat object.

But now when i throw a towel in front of the PiR it will go off, even if i screw the senstivity dial it does not help

I need someone that can help write a basic example that only goes of when it detects a larger heat source and no small objects that dont have Heat.

My idea is to create a proxyimity alarm for camping.
So when i sleep at night and someone is approaching me to my tent i want the alarm to go off wireless into my tent.
But when some little squirrles passes by or a bird flies in front of the sensor i dotn want it to trip the sensor or some brenches that fall from the trees.
If i could only get someone to help me out with the large heat source detection then i think i can manage the rest with the wireless alarm.

I hope i get someone excited to help me out.
Im a starter so please if my post is not correct then let me know in a nice way.

2

Hello Jaap,

Your project looks really interesting

I will suggest you use another sensor to detect the thermal radiation ( Thermal sensor )

In that way you will have a IR picture and you could post process the image by pixels

FLIR cameras used to be the first option but they are really expensive. Have a look at this thermal sensor much cheaper. I think they will be suitable for your application.

In addition they are pretty small and there is some code already done in Arduino. Check their downloads section.