{HowTo} turn on/off your monitor (Time based, PIR/Button, App)

MadScientist

This is how my setup looks like at the moment:
alt text
Relay: Black = GND, white = Vcc 3.3V, green = IN
PIR: Black = GND, red = Vcc, green = out

Gray, blue, puple = ds18b20 temperature sensor.

I actually haven’t had a false trigger yet and the Pi is running for more than an hour now. I will keep it running the whole day. Have a multimeter connected to the relay, set to continuity test, so I should hear a beeping sound every time the relay gets triggered.

cruunnerr

@MadScientist

sounds like a good plan :)

edit:
i also made changes to the scripts so now u were able to end them via “ctrl+c”.
Don’t know if i did everything correct but it works here. :)
I am just electronics technician and no programer ^^

hoofta

I got really excited to see this post when it was shared a few weeks ago. Unfortunately, I have yet to get it to work. I am using a PIR sensor along with Paviro’s module. My issue is that I am using an LG TV which, when the signal is no longer received from the HDMI port, a “no signal” screensaver bounces around. So my goal is to get the screen to just go to black while the raspberry pi does not enter a power-save mode.

I have attempted to use the “screen_off/on” option original provided instead of the “monitor_on/off” but it doesn’t seem to be working properly.

I have tested that the PIR is connected but in my test it keeps teling me that motion is detected when there is no movement. I am doing this through a python script. I am fairly new at this so if anyone can please let me know what else I can provide you to help me get this thing working with the PIR sensor. Thanks.

MadScientist

@hoofta Couldn’t you use a relay (like me) but instead of disconnecting the power you just trigger the power on/off button?

hoofta

@MadScientist I am not sure if I could or not. Could you elaborate on how you have yours setup?

MadScientist

@hoofta My mirror isn’t done yet but in my case the relay will disconnect the power from the power supply to the LCD. I have no idea what TV you’re using but you could solder 2 wires to the power button of your TV and connect them to a relay, which will be triggered by a PIR motion sensor.

cruunnerr

@hoofta said in {HowTo} turn on/off your monitor (Time based, PIR/Button, App):

I have attempted to use the “screen_off/on” option original provided instead of the “monitor_on/off” but it doesn’t seem to be working properly.

As described u need to use the “pir.py” script from point 2.2.
But then (and i forgot to write that) u need to change the shell script names in the script or keep the “monitor_on” as name.
Sorry for my english, i hope u understand.

So, to help u out:
u already creates the “screen_on.sh” and “screen_off.sh”, right?

then u need to change the following lines in the “pir.py” script like this:

def turn_on():
	subprocess.call("sh /home/pi/screen_on.sh", shell=True)

def turn_off():
	subprocess.call("sh /home/pi/screen_off.sh", shell=True)

The idea to connect the power button of the TV to a relay is a good start. So u could save much money.

But then the relay must do an impulse instead of being on or off static.

To do this u could use the normal pir.py script from point 2.2 (without any changes).
But the content of both *.sh files should look like this:

nano monitor_on.sh :

gpio -g write 27 1
sleep 1
gpio -g write 27 0

nano monitor_off.sh :

gpio -g write 27 1
sleep 1
gpio -g write 27 0

chmod +x monitor_on.sh
chmod +x monitor_off.sh

Connect the relay with two wires parallel to the power button of your tv.
On the relay use “C” and “NO”

hoofta

@cruunnerr I did see originally where the monitor_on/off.sh needed to have the word “monitor” replaced with “screen” in the pir.py script. I am not sure I am confident enough to solder in a relay to the power switch on my TV. :-/

What script do you use to confirm your PIR is hooked up correctly and receiving the proper signal/input?

cruunnerr

@hoofta said in {HowTo} turn on/off your monitor (Time based, PIR/Button, App):

What script do you use to confirm your PIR is hooked up correctly and receiving the proper signal/input?

Just use the pir.py script from the tutorial ;)

every movement will show some dots in your terminal

hoofta

@cruunnerr Right, sorry about that. I forgot you included it. When I did that during initial setup, the dots scrolls across without stopping. Motion or not, dots keep generating.