MMM-PIR-Sensor-Lite does not switch HDMI off

sdetweil

@dkhorse74 another user noticed this only worked for the 1st HDMI port on the pi4.

had to change the code in the node_helper.js for the second port

dkhorse74

@sdetweil
Thank you I will try… I ran:

xrandr -q

which show HDMI-2 is what is currently plugged in… Will report back

dkhorse74

@sdetweil
that did it! Screen goes to sleep… now need to figure out how to get the doppler sensor to “wake-up” the monitor

sdetweil

@dkhorse74 the module turns it back on… another place for the hdmi port…

the sensor just signals movement, usually a high signal…

the module then signals wake up and starts a time…

no more high signals, then sleep…

dkhorse74

@sdetweil
yep, understood… Still not able to wake up the screen… I tested the sensor with a meter and getting correct input voltage… is there anything I could be missing?

dkhorse74

@sdetweil
Found another post where you shared a link on how to run a PY script to test the sensor:

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

Going to try this later tonight.

dkhorse74

Got everything to work perfectly…

For anyone else who maybe considering using the doppler sensor with a potentiometer, you can follow the “how-to” thread in my initial post BUT use the MMM-PIR-Sensor-Lite module only as it keeps things simple. The other PIR modules may not work with Debian 11 (Bullseye)

As for the resolution, the mistake was on my end:

I had “GND” and “Vout” swapped on the board pins
I had to join my raspberry login id to group “gpio”

The following page is very useful to test the functionality of the sensor before you implement the change to mirror config file (thanks to @sdetweil for posting the link in a different thread):

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

Again thanks to all for the help…

grena

@dkhorse74

Got everything to work perfectly…

:thumbs_up:

The following page is very useful to test the functionality of the sensor before you implement the change to mirror config file (thanks to @sdetweil for posting the link in a different thread): https://projects.raspberrypi.org/en/projects/parent-detector/3

Yes, You can also run the python script of the module: python3 -u ~/MagicMirror/modules/MMM-PIR-Sensor-Lite/pir.py SENSOR_PIN

@sdetweil

another user noticed this only worked for the 1st HDMI port on the pi4.

Yes, I add this point of vigilance at the beginning of the readme :white_heavy_check_mark:

sdetweil

@grena a more better thing would be to make a parameter for config so the user can change it without editing your code.

dkhorse74

@grena said in MMM-PIR-Sensor-Lite does not switch HDMI off:

:thumbs_up: Yes, You can also run the python script of the module: python3 -u ~/MagicMirror/modules/MMM-PIR-Sensor-Lite/pir.py SENSOR_PIN