MagicMirror Forum

    • Register
    • Login
    • Search
    • Recent
    • Tags
    • Unsolved
    • Solved
    • MagicMirror² Repository
    • Documentation
    • Donate
    • Discord

    skywriter - python to javascript

    Development
    3
    18
    9363
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • K
      kclemen last edited by kclemen

      Just bought a skywriter to control my mirror based on swipes and presses. (https://shop.pimoroni.com/products/skywriter-hat)

      It comes with a python library: https://github.com/pimoroni/skywriter-hat

      What I would like to achieve is that a certain div comes to the page when I make a “up” gesture. Or when I swipe left, that the entire page is switched to another profile.

      What is the best starting point to control javascript in a webpage thru python?

      J 1 Reply Last reply Reply Quote 0
      • J
        Jopyth Moderator @kclemen last edited by

        @kclemen If you want an example of how to put together python and a module, you can have a look at this. It uses a python backend for face recognition. I think you could use a similar approach to “listen” for flicks.

        Helpful sticky: How to troubleshoot

        1 Reply Last reply Reply Quote 1
        • K
          kclemen last edited by

          Thanks for your reply. First glance at the link, seems to be rather difficult to implement what I want.

          Following code can be generated in py to link an action to a certain “gesture”:
          if(start == “north” and finish == “south”):
          print “Volume: down”
          system(“irsend SEND_ONCE TV KEY_VOLUMEDOWN”)
          elif(start == “south” and finish == “north”):
          print “Volume: up”
          system(“irsend SEND_ONCE TV KEY_VOLUMEUP”)

          I would like to slde in a certain dev when I wave from “north” to “south”… Searches on the net results that py and javascript do not work ery well together?

          J 1 Reply Last reply Reply Quote 0
          • J
            Jopyth Moderator @kclemen last edited by Jopyth

            @kclemen Well, you can try googling for node.js (which is programmed in javascript) and python, and the answer will be quite different.

            If you want to program this module, you will need (at least) 3 components (I will demonstrate how it works in the facial recognition example):

            • the module in the browser:
              this will listen for events send from node_helper.js, for example see this function. In the example, it broadcasts this event to all modules (here), and then catches that notification again (here) to show all modules with a certain class

            • the node_helper.js:
              this is what will be calling your python code in the backend, for example in this line the python module is started, and then listens for events here

            • your python code:
              not much here you need, most of the code would look like your example, except the communication to node from this line

            Hope this helps to get you started.

            Helpful sticky: How to troubleshoot

            K 1 Reply Last reply Reply Quote 3
            • K
              kclemen @Jopyth last edited by

              @Jopyth Thanks for your wonderful reply. Will take a look at it as soon the skywriter is delivered.

              1 Reply Last reply Reply Quote 0
              • K
                kclemen last edited by

                ok, first steps are being taken… https://github.com/Kclemen/MMskywriter

                1 Reply Last reply Reply Quote 1
                • K
                  kclemen last edited by kclemen

                  fixed it…

                  K 1 Reply Last reply Reply Quote 0
                  • K
                    kclemen @kclemen last edited by

                    I’ve got following error:

                    SyntaxError: Unexpected token g in JSON at position 0
                    at PythonShell.asJson (/home/pi/MagicMirror/modules/MMM-skywriter/node_modules/python-shell/index.js:142:21)
                    at /home/pi/MagicMirror/modules/MMM-skywriter/node_modules/python-shell/index.js:232:35
                    at Array.forEach (native)
                    at PythonShell.receive (/home/pi/MagicMirror/modules/MMM-skywriter/node_modules/python-shell/index.js:231:11)
                    at emitOne (events.js:96:13)
                    at Socket.emit (events.js:188:7)
                    at readableAddChunk (_stream_readable.js:176:18)
                    at Socket.Readable.push (_stream_readable.js:134:10)
                    at Pipe.onread (net.js:543:20)

                    Here is the script:
                    `#!/usr/bin/env python
                    import sys
                    import json
                    import time
                    import signal
                    import skywriter

                    some_value = 5000

                    last_airwheel = 0
                    delay = 5000

                    def to_node(type, message):
                    # convert to json and print (node helper will read from stdout)
                    try:
                    print(json.dumps({type: message}))
                    except Exception:
                    pass
                    # stdout has to be flushed manually to prevent delays in the node helper communication
                    sys.stdout.flush()

                    to_node(“status”, ‘Skywriter started…’)

                    @skywriter.flick()
                    def flick(start,finish):

                    #slide music player div OFF the screen
                    if(start == "north" and finish == "south"):
                    	print "gesture is north to south"
                    	to_node("gesture", "down")
                    
                    #slide music player div ONTO the screen
                    elif(start == "south" and finish == "north"):
                    	print "gesture is south to north"
                    	to_node("gesture", "up")
                    
                    #Next track
                    elif(start == "west" and finish == "east"):
                    	print "Gesture is west to east"
                    	to_node("gesture", "next")
                    
                    #previous track
                    elif(start == "east" and finish == "west"):
                    	print "Gesture is east to west"
                    	to_node("gesture", "previous")
                    
                    #else:
                    	# print "Invalid"
                    

                    @skywriter.airwheel()
                    def spinny(delta):
                    global some_value
                    global last_airwheel
                    global delay
                    some_value += delta
                    if some_value < 0:
                    some_value = 0
                    if some_value > 10000:
                    some_value = 10000
                    now = int(round(time.time() * 1000))
                    if(now - last_airwheel > delay):
                    print(“TV & Digibox: power”)
                    # system(“irsend SEND_ONCE TV KEY_POWER”)
                    # system(“irsend SEND_ONCE Digibox KEY_POWER”)
                    last_airwheel = now

                    signal.pause()`

                    I do not really understand what is wrong? Anybody an idea?

                    J 1 Reply Last reply Reply Quote 0
                    • J
                      Jopyth Moderator @kclemen last edited by

                      @kclemen Please use three backticks (```) for markdown if you paste your code, instead of one (`). Otherwise it will not recognize it as multi line code.

                      The problem are your regular print statements (e.g. print "Gesture is west to east"), these are also read by node, and they are not in the JSON format. You can comment these out, or maybe write them to a log file instead, if you want them to debug.

                      Helpful sticky: How to troubleshoot

                      1 Reply Last reply Reply Quote 0
                      • K
                        kclemen last edited by

                        Thanks for the input. Indeed this was the mistake.

                        seems I’m missing still something. Now I get following error:

                        TypeError: parser.close is not a function
                        at SAXStream.openf1 (/home/pi/MagicMirror/node_modules/feedme/lib/xmlfeedparser.js:107:14)
                        at emitOne (events.js:96:13)
                        at SAXStream.emit (events.js:188:7)
                        at Object.me._parser.(anonymous function) [as onopentag] (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:258:17)
                        at emit (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:640:35)
                        at emitNode (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:645:5)
                        at openTag (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:841:5)
                        at Object.write (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:1404:13)
                        at SAXStream.write (/home/pi/MagicMirror/node_modules/sax/lib/sax.js:239:18)
                        at yoshi.write (/home/pi/MagicMirror/node_modules/feedme/lib/feedme.js:41:14)

                        1 Reply Last reply Reply Quote 0
                        • 1
                        • 2
                        • 1 / 2
                        • First post
                          Last post
                        Enjoying MagicMirror? Please consider a donation!
                        MagicMirror created by Michael Teeuw.
                        Forum managed by Paul-Vincent Roll and Rodrigo Ramírez Norambuena.
                        This forum is using NodeBB as its core | Contributors
                        Contact | Privacy Policy