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My pir almost finished. Waiting for my enclosures from aliexpress.

@leader21 I am sorry to hijack. @sweebee I just want to let you know that I have fixed issue by change 1 Mhz to 8 Mhz clock. PIR is now working excelent

@misakm Try to get the 1Mhz also working if your using it with batteries, it uses less energy.

@sweebee
1 Mhz not working for me - protocol not recognized. I would be appreciated if you can write totorial
Michal

1Mhz is working fine here. I will write a tutorial soon how I did it and how its working for me.

Made myself a moodlight with the NRF24 chip.

Hardware:

Ikea Fado
Neopixel ring 16
Arduino Pro Mini 3.3v
NRF24

Looks very nice https://www.youtube.com/watch?v=eJSG8-6Ldng

@sweebee, is the schema correct? The red wire of the hc-sr501 is not connected with ‘minus’ on the breadboard?! Should this ‘continuous’ -pin be connected to ‘minus’? And is it correct that the black wire to the hc-sr501 should be connected to ‘plus’? This is not in line with the following schema

@skipper79 This is correct:

Here my first battery powerd PIR . I used the housing of a smoke detector. The diameter of the speaker fits perfect for the PIR

Right now I’m using it to turn on the wifi on the 1st floor.

if PIR is present and my_smartphone is present
then turn WLAN oben on for 20 minutes

@magic-tune said:

Here my first battery powerd PIR . I used the housing of a smoke detector. The diameter of the speaker fits perfect for the PIR

Nice idea! Very good job. Thanks for this inspiration!

but

It looks like you removed the electronics of the smoke detector. Next step, leave it in - add the attiny with PIR - send status of PIR AND status of smoke detector to pimatic - Voila, your own fire alarm system

Most pictures shows that all these PIR’s are working on two AA batteries.
The PIR’s I see on the chinese web pages have a Working Voltage Range: DC 4.5V- 20V
How does that work?

The hcsr501 has a voltage regulator from 4.5V-20V to 3.3V.
This works with 2 AA batteries by bypassing the onboard voltage regulator.

@Oitzu said:

The hcsr501 has a voltage regulator from 4.5V-20V to 3.3V.
This works with 2 AA batteries by bypassing the onboard voltage regulator.

And you bypass it by connecting the PIR as shown in these pictures I assume?

@cees have a look at the schematics:

By connecting to Pin3 of JP1 you bypass the VIN of the IC1 7133-1 (voltage regulator).
Short: yes.

Ordered all the stuff at my chinese friends.
Now I hope that programming the Attiny85 via the RPI will not be any problem…

@cees: if you happen to have an arduino nano or similiar laying arround, use that.
The raspberry pi will work as programmer but using an arduino is nicer because you can out of the box use the arduino ide etc…

@Oitzu Mmm, interesting. I will try to find more info about that option. Thanks

@cees http://forums.4fips.com/viewtopic.php?f=3&t=1080 This looks to me like a pretty good tutorial.
But Step 2 is maybe a little bit outdated due to new arduino ide.

@Oitzu Thanks! That seems a great tutorial.