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A New Chapter for MagicMirror: The Community Takes the Lead
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skywriter - python to javascript

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  • J Offline
    Jopyth Moderator @kclemen
    last edited by Dec 3, 2016, 7:58 PM

    @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 Offline
      kclemen
      last edited by Dec 3, 2016, 8:49 PM

      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 Dec 4, 2016, 9:20 AM Reply Quote 0
      • J Offline
        Jopyth Moderator @kclemen
        last edited by Jopyth Dec 4, 2016, 9:23 AM Dec 4, 2016, 9:20 AM

        @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 Dec 4, 2016, 9:33 AM Reply Quote 3
        • K Offline
          kclemen @Jopyth
          last edited by Dec 4, 2016, 9:33 AM

          @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 Offline
            kclemen
            last edited by Dec 4, 2016, 11:27 AM

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

            1 Reply Last reply Reply Quote 1
            • K Offline
              kclemen
              last edited by kclemen Dec 7, 2016, 10:09 PM Dec 7, 2016, 8:14 PM

              fixed it…

              K 1 Reply Last reply Dec 7, 2016, 11:18 PM Reply Quote 0
              • K Offline
                kclemen @kclemen
                last edited by Dec 7, 2016, 11:18 PM

                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 Dec 8, 2016, 11:18 AM Reply Quote 0
                • J Offline
                  Jopyth Moderator @kclemen
                  last edited by Dec 8, 2016, 11:18 AM

                  @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 Offline
                    kclemen
                    last edited by Dec 8, 2016, 4:10 PM

                    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
                    • K Offline
                      kclemen
                      last edited by Dec 8, 2016, 6:36 PM

                      Ok, the script is performing without any errors at the moment.

                      Would somebody be so kind to check why console.log(“payload.action is up”); is not executed in MMM-skywriter.js?

                      I only get the message from node-helper.js : console.log(“[” + self.name + "] " + message.gesture);

                      Files can be found here: https://github.com/Kclemen/MMM-skywriter

                      1 Reply Last reply Reply Quote 0
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