UPDATE: Replaced my PIR-Sensor with a Doppler Microwave Sensor.

[uros76]

@Lipax said in UPDATE: Replaced my PIR-Sensor with a Doppler Microwave Sensor.:

hello,
i tried this with the microwave sensor, but im out of ideas. i get wrong positives every minute. (i check every 5 sec).
i added also the ferrite, tried another raspberry, different of these sensors (bought a 5 pack) and placed it in a different room. anyone got any ideas what else i could try?
or maybe similar microwave sensors i could try?

any help would be great, tyvm

Did you try and limit the range as described in beginning of this thread? For me option 2 helped to limit oversensitivity.

[Lipax]

@uros76
the range is not the problem. i get positives when nothing is moving near it

[uros76]

@Lipax this sensor is very sensitive and catches any movement 360 around from several meters away. I had same problem… If you don’t dial down the sensitivity-range you will keep getting false positives.

[kayakbabe]

@Lipax try dialing down the sensitivity, it’s probably picking up dust or something small you can’t see.

[Lipax]

thanks for the help, but i doubt its some kind of movement since its exactly every minute. i tried a different room and its the same.

[sdetweil]

@Lipax please don’t submit duplicate posts…

all users with reputation below 2 have their posts reviewed… this eliminates all the porn, advertising and trash posts from the forum.

it just takes time for (me) to get to review the posts…

[uros76]

Can you share your python code? Perhaps there’s something there

[Lipax]

@sdetweil sry about that

@uros76 i hope thats not the problem

import RPi.GPIO as GPIO
import time
import datetime

switch=11


GPIO.setmode(GPIO.BOARD)
GPIO.setup(switch, GPIO.IN)




try:
    while True:
        if GPIO.input(switch) == 1:
            now = datetime.datetime.now()
            print(now.strftime("%Y-%m-%d %H:%M:%S"), "something")
            
        time.sleep(5)
        
        
except KeyboardInterrupt:
    print("Bye Bye")
finally:
    GPIO.cleanup()

thanks for the help

[uros76]

@Lipax try different gpio pin, like a pin 18 which is a GPIO 5. It’s default set to input function. Don’t forget to adjust the python code, change switch to 18.

You might check the GPIO 0 (your pin 11) if it is set to input. Use command: raspi-gpio get 0 or raspi-gpio get to check all GPIO’s.

Also, use a multimeter to measure the voltage coming out from sensor. It should be around 3.3V for few seconds when sensing detected. This way you can monitor if actual detection / voltage is coming from sensor.

[Lipax]

@uros76
i forget to mention i already changed the pin, i first tried pin 7 before

according to pinout.xyz my pin 11 is gpio 17

GPIO 17: level=0 fsel=0 func=INPUT

thank you very much for helping me, i dont have a multi meter but ill ask my father to do that. u think its not the sensor sending the signal? maybe it picks up something with the wire along the way? i dont have a engineering background.