MMM-GroveGestures -> ShellExec "Python script"

[Robert_K]

Good day fellow builders,

I’m building my second MagicMirror and it works for 95%.
I’m using the MMM-GroveGesture module to switch between Pages (MMM-Pages and MMM-Page indicator).

I’m having WS2801 LED’s connected. For these LED’s I wrote two Python scripts. When executing the python scripts in the RPI (4) terminal they work flawless.
However I want to activate the scripts by the gestures. So with the up gesture, switching on the LED’s, and with the down gesture, switching them off.

Reading the MMM-Grove Gesture module readme I can use three types of executions:

• shellExec: “…”,
• notificationExec: { … },
• moduleExec: { … },

Now I’m a bit lost. I tried to use the shellExec command, but it does not start my python script. If I change it to for example ‘sudo reboot now’ the execution of the gesture does work. Here is (a part) of my config file:

{
 			module: "MMM-GroveGestures",
  			position: "top_right",
  			config: {
					autoStart: true, //When Mirror starts, recognition will start.

					gestureMapFromTo: { //When your sensor is installed with rotated direction, you can calibrate with this.
										"Up": "RIGHT",
										"Down": "LEFT",
										"Left": "UP",
										"Right": "DOWN",
										"Forward": "FORWARD",
										"Backward": "BACKWARD",
										"Clockwise": "CLOCKWISE",
										"anti-clockwise": "ANTICLOCKWISE",
										"wave": "WAVE"
										},

					defaultNotification: "GESTURE",
					pythonPath: "/usr/bin/python", // your python path

					defaultCommandSet: "default",
					commandSet: {
								"default": {
											"LEFT": {
											notificationExec: {
											notification: "PAGE_INCREMENT",
											payload: null
															  }
													},
											"RIGHT": {
											notificationExec: {
											notification: "PAGE_DECREMENT",
											payload:null,
															  }
													},
											"UP": {
											shellExec: "sudo reboot now",	  
												  },
											"DOWN": {
											shellExec: "python ws2801_uitschakelen.py",
													}
											},											  
       							},
					}
		},

So I’m wondering, how to start my python script with this module? Anyone can point me in the right direction? Thanks in advance.

Regards Robert

[sdetweil]

@Robert_K

sorry, jumped too fast… you want to know HOW to launch

see my PythonPrint module which launches a python script …
https://github.com/sdetweil/MMM-PythonPrint

well. actually its probably the first…
https://forum.magicmirror.builders/topic/16554/mmm-pythonprint-customisation/2?_=1648232499718

the gesture node_helper does exec

so the same command you would do from the commandline…

but python has trouble with libraries when invoked in the background…

[Robert_K]

So after some thinkering with the hint I got, I’ve got the code working:

"UP": {
shellExec: "python /home/pi/ws2801_inschakelen.py",	  
	     },
"DOWN": {
shellExec: "python /home/pi/ws2801_uitschakelen.py",
			}

Thanks for the help!