2

I have setup my raspberry pi and have inserted the correct wires to the motion sensor, i am currently running a a simple script that detects motion however it constantly outputs that it motion is detected although i have no interacted with the sensor. I am unsure as to what i should do as ive tried numerous things. enter image description here

here is the script also:

from gpiozero import MotionSensor
import time

print ("Ready")
pir = MotionSensor(4)
time.sleep(40)
while True:
    if pir.motion_detected:
        print("Motion detected")
        time.sleep(2)
2
  • what is the purpose of the picture? ... please draw a diagram of the connections between the sensor and the RPi
    – jsotola
    Apr 26 at 22:32
  • It's possible the wiring is bad, especially ground. I find that these types of jumper wire are not reliable.
    – Aloha
    May 11 at 19:09
3

That is not a motion sensor. It is a heat detector. If it sees a change in infra-red (heat) it raises an alarm.

As long as you are 'seen' by the sensor it will raise an alarm.

2
  • 1
    As you said, if it sees a change in IR it will trigger the output. If a warm object is stationery then the sensor sees no change and does not raise an alarm. So, it is a motion sensor if it is a warm object that is in motion. Apr 26 at 21:23
  • 1
    Yes it is a motion sensor, here is the link of the purchase - thepihut.com/products/…
    – Kazi Ilyas
    Apr 26 at 23:54
0

Question

How come my PIR motion sensor output is always High, falsely detecting something moving?


pir 2


Answer

pir sensors

  1. Your photo is very nice.

  2. I see the PIR motion sensor in the bottom right corner.

  3. You motion sensor HC-SR502 (Ref 3) is very popular, but usually not very stable.

  4. I would recommend to use a good sensor AM302.

  5. You might like to read my PIR answer (Ref 1), for more details on:

    a. How to prove that the PIR is unstable.

    b. Which stable PIR sensor to use.


References

(1) Why is HC-SR501 PIR motion Sensor always on? Asked 2020, Viewed 3k times

(2) tlfong01's Penzu Learning Notes v0.3 2021apr30

(3) PIR Motion Sensor Module THE PI HUT SKU: 100283 (50 Reviews) Price: £3


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