PIR Sensor won't wake up

Sceetch

Hi guys,

i want to install for my Magicmirror project a PIR Sensor (HC-SR501) for switching the monitor automatically on/off.

i have already tested MMM-PIR-Sensor and MMM-PIR. But both have the same issue.

After the adjusted delay the monitor switches off. But there is no chance to wake it up again.

It seems to me that i have installed something wrong in the pins.
In both modules i need a value for sensorPin:
That mean the "out"wire of the PIR? thats right. That mean according my Occupancy i have to put “16” into it?
20210219_213752.jpg

please help!

karsten13

should be 23 (not 16)

alt text

Sceetch

Thx. now the table should be clear.
But the PIR doesn’t work.
After delay the screen switch off.
But i can breakdance in front of the sensor. It happend nothing…

but if i remove the cable from sensorpin 23 the sceen wakes up.

Sceetch

hi.
There are some news about my Sensor problem.

i tried to install these steps according this link

https://teilzeitrebell.de/blog/magicmirror-part-2-bewegungsmelder

i made two sh-scripts for screen on & off

monitor_off.sh
monitor_on.sh

then i created this phyton

pir_loop.py

!/usr/bin/env python

import sys
import time
import RPi.GPIO as io
import subprocess

io.setmode(io.BCM)
SHUTOFF_DELAY = 10  # seconds
PIR_PIN = 17        # Pin 11 on the board

def main():
    io.setup(PIR_PIN, io.IN)
    turned_off = False
    last_motion_time = time.time()

    while True:
        if io.input(PIR_PIN):
            last_motion_time = time.time()
            sys.stdout.flush()
            if turned_off:
                turned_off = False
                turn_on()
        else:
            if not turned_off and time.time() > (last_motion_time + SHUTOFF_DELAY):
                turned_off = True
                turn_off()
        time.sleep(.1)

def turn_on():
    subprocess.call("sh /home/pi/Pir-Sensor/monitor_on.sh", shell=True)

def turn_off():
    subprocess.call("sh /home/pi/Pir-Sensor/monitor_off.sh", shell=True)

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        io.cleanup()

i can start this with

python pir_loop.py

and it seems that it works.

But in the code i defined a delay of 10 seconds. But after it, it happend nothing.
the weird thing is, that the screen turn off after exact 2 minutes. If i move in front of the sensor the screen turn on again.
But if i do nothing or cover the sensor with something the screen turn on after exact one minute.

does anybody has an idea, whats wrong there?

ebolisa

@sceetch I’ve, more or less, the same setup but the sh files stored in the MagicMirror folder.

dbg

@sceetch Which Raspberry Pi board are you using?

Sceetch

@dbg i’m using Raspberry Pi 3 Modell B Plus (B +)

I have no idea whats wrong.
I can change the delay time value randomly. There is no effect. After exact 2 minutes the screen turn off.

Could it be, there is something activated in the tvservice?

sdetweil

@sceetch off is because the module does this no motion was detected

dbg

@Sceetch

Hi

I installed the MMM-PIR-Sensor last week and I had a similar problem. I just couldn’t get the sensor to work with the module. I spent a lot of time and tried a few different things and nothing worked… in the end I updated the wiringPi GPIO access library (I’m using a Pi 4 Model B).

See here:

http://wiringpi.com/wiringpi-updated-to-2-52-for-the-raspberry-pi-4b/

And now it’s working OK. I’m not saying this will fix your problem. It may be that an install I did overwrote the wiringPi files on my Pi or rolled them back in some way, but it worked for me.

Regards

dbg62

sdetweil

@sceetch also i think u need to make sure the sensor actually works

https://projects.raspberrypi.org/en/projects/parent-detector/3

Sceetch

@sdetweil thx for your comment.

I guess the sensor works.
If i start this script, the sensor switch after 2 minutes off.
If the sensor receives movements, the screen turn on, so i think it works. But i will test your script in the evening.

If there is no movement registered from the sensor the screen switch on after 1 minute.

I don’t understand why the countdown is 2 min? In the script the delay time is setted by 10 sec.

And why the screen turns on after another one minute. If there is no signal from the sensor??

sdetweil

@sceetch the sensor must be detecting heat difference. its very sensitive. the dial .ust be set to about 2 minutes, since last movement…

there is a jumper on some of the boards that changes how long it holds the signal active since movement.

Sceetch

@sdetweil
Hi sdetweil, this was a good hint. I think the problem are the adjustments of the sensor itselfs. the time values in my previous post changed now. But the problem still exists.

The reason why the screen wake up without movement is, the overlapping of signals. there is one delay in the script, but also one of the Sensor. If the script turns off the screen and the sensor gives also a signal regarding the time delay a little later, the screen will turn on again. so my opinion.

But what is now the best adjustment of it?
is it possible to inactivate the time delay of the sensor itself?

In what position is the jumper to be set?
sensivity of it should be clear. thats a customized value for the different situations.

sdetweil

@sceetch google to answer those questions

BravoOscar

@sceetch

I just added a PIR sensor, and I have put jumper on “L” and the two potmeteres on low (clockwise) . This works fine.

Here you have som more information on the PIR sensor.

https://lastminuteengineers.com/pir-sensor-arduino-tutorial/

I use this module:
https://github.com/bugsounet/MMM-NewPIR
In the config, I have chaged delay from delay: 2 * 60 * 1000 // 2min to delay: 10 * 60 * 1000 //10min

jste84

I’m having a similar issue using Mmm-PIR-Sensor

Using a pi 3b+ and it turns the screen off but not back on again…

jste84

Having tested the commands it looks like
sudo tvservice -p doesn’t work with my monitor. (-o works though which is strange?)

Vcgencmd works perfectly though…

Could this be a reason why it’s not working?

sdetweil

@jste84 yes change the command the module uses

jste84

@sdetweil is it this line

sudo chmod u+s /opt/VC/bin/tvservice && sudo chmod u+s bin/chvt

That I need to change? Would I just change TV service to vcgencmd

sdetweil

@jste84 maybe. dont know. you could try