I’m trying to do an alarm project using this PIR
There are 4 ports on this PIR, 1-2 is 12V power supply, i’m powering up the PIR with 12V external power supply, 3-4 ports are for alarm.
There is no any volt on 3-4 ports, when i switch to buzzer mode on my multimeter i just realised 3-4 ports are shorted.
I mean if PIR not detecting any movement buzzer of the multimeter is beeping, but if PIR detects movement then buzzer of the multimeter is not beeping until PIR returns to idle mode.
As far as i understand if there is no movement 3. & 4. ports are shorting and if there is any movement then 3. & 4. ports are not shorting.
What i want to do is use these 3-4 ports as trigger, but i couldn’t find any method to read short-unshort status of the PIR.
I’ve found some topics in the forum but didn’t fit to my situation.
What i’ve tried is :
connected 3. port to 5V - 4. port to Ground and A0 on arduino tried to read from analog – no luck.
connected 3. port to 5V - 4. port to Ground and 2 on arduino tried to read from digital – no luck
Reversed polarity – no luck.
Do you guys have any ideas how to use 3-4 port as trigger on arduino ?