WiiFit Waage

Übersicht

Dieses Python Skript baut eine Bluetooth Verbindung mit einem Wii Fit Board auf. Ist dies erledigt, schickt es das ermittelte Gewicht (in einer Dauerschleife) übers Netzwerk an FHEM. Forumsthread

Ohne eine Versionsnummerierung zu haben, nenne ich es mal 0.1 => erste öffentliche Version

Voraussetzungen

• Getestet mit Debian Wheezy.
• Bluetooth Stick
• Relais (wenn fhem das Pairing automatisch machen soll)

Konfiguration der Software

Das Programm an sich benötigt eine Config-Datei.

Beispieldatei, könnte Fass_1.json" genannt werden

{
	"BT-Adress": "00:25:A0:40:5C:28",
	"fhem_host_port": "http://127.0.0.1:8083",
	"fhem_request": "/fhem?cmd=",
	"fhem_command": "setreading%20Fass_1%20Gewicht"
}

Was ist hier einzustellen?

• "BTAdress": Bluetoothadresse des Wii Fit Boards
• "fhem_host_port": Adresse des fhem Servers, ebenso wie der Port. (Muss man also anpassen)
• "fhem_request": (weiß nicht, wie es heißt), sollte aber so passen
• "fhem_command": das, was fhem dann wirklich tun soll; hier: setreading Fass_1 Gewicht
  • das Gewicht.py hängt da dann das Gewicht in dran und sendet es an fhem

Aufruf

$ ./Gewicht.py --conf "Fass_1.json"

Benötigte Pakete installieren

sudo apt-get install python-bluetooth bluez python-gobject

Um die Adresse in Erfahrung zu bringen:

$ hcitool dev

Hardware-Modding

Leider kann man kein automatisches Pairing (wie bei einer Freisprechanlage und dem Handy im Auto) einrichten. Also ich kann es jedenfalls nicht. Daher muss bei jedem Skriptaufruf (das Skript läuft dann in einer Dauerschleife) den kleinen roten Pairing Knopf drücken. Der ist intelligenterweise unter der Batterieabdeckung.

Lösung:

Auf die Rückseite der Platine werden bei dem Taster 2 Drähte angelötet. Nun kann man z.B. mit einem Relais einfach kurz den Kontakt schließen lassen, so dass das Pairing am Board eingeleitet wird. Vom Timing her empfiehlt es sich (wenn man es von Hand mal ausprobieren will ohne Löterei), zuerst das Wii Fit Board in den Pairing Modus zu bringen, dann das Skript zu starten.

Programmcode

z,B. mit

$ nano Gewicht.py

Direkt im Wunschverzeichnis ablegen.

#!/usr/bin/env python

import collections
import time
import bluetooth
import sys
import subprocess
import json
import urllib
import argparse

# --------- User Settings ---------
WEIGHT_SAMPLES = 500
# ---------------------------------

# Wiiboard Parameters
CONTINUOUS_REPORTING = "04"  # Easier as string with leading zero
COMMAND_LIGHT = 11
COMMAND_REPORTING = 12
COMMAND_REQUEST_STATUS = 15
COMMAND_REGISTER = 16
COMMAND_READ_REGISTER = 17
INPUT_STATUS = 20
INPUT_READ_DATA = 21
EXTENSION_8BYTES = 32
BUTTON_DOWN_MASK = 8
TOP_RIGHT = 0
BOTTOM_RIGHT = 1
TOP_LEFT = 2
BOTTOM_LEFT = 3
BLUETOOTH_NAME = "Nintendo RVL-WBC-01"

# Read Configuration from .json file
ap = argparse.ArgumentParser()
ap.add_argument("-c", "--conf", required=True,
	help="path to the JSON configuration file; eg try: >wiiboard_kneipe.py --conf waage1.json")
args = vars(ap.parse_args())

#ConfigFile laden
conf = json.load(open(args["conf"]))
client = None

# create Network command
url = (conf["fhem_host_port"])
request = (conf["fhem_request"])
command = (conf["fhem_command"])
#value =  "%20" + str(white)
fhem = url + request + command +"%20"
#print fhem
#urllib.urlopen(fhem)

class EventProcessor:
    def __init__(self):
        self._measured = False
        self.done = False
        self._measureCnt = 0
        self._events = range(WEIGHT_SAMPLES)

    def mass(self, event):
        if (event.totalWeight > 2):
            self._events[self._measureCnt] = event.totalWeight
            self._measureCnt += 1
            if self._measureCnt == WEIGHT_SAMPLES:
                self._sum = 0
                for x in range(0, WEIGHT_SAMPLES-1):
                    self._sum += event.totalWeight
                self._weight = self._sum/WEIGHT_SAMPLES
                self._measureCnt = 0
                print str(self._weight) + " kg"
		fhemComplete = fhem + str(self._weight)
		#print fhemComplete
		urllib.urlopen(fhemComplete)
            if not self._measured:
                self._measured = True

    @property
    def weight(self):
        if not self._events:
            return 0
        histogram = collections.Counter(round(num, 1) for num in self._events)
        return histogram.most_common(1)[0][0]


class BoardEvent:
    def __init__(self, topLeft, topRight, bottomLeft, bottomRight, buttonPressed, buttonReleased):

        self.topLeft = topLeft
        self.topRight = topRight
        self.bottomLeft = bottomLeft
        self.bottomRight = bottomRight
        self.buttonPressed = buttonPressed
        self.buttonReleased = buttonReleased
        #convenience value
        self.totalWeight = topLeft + topRight + bottomLeft + bottomRight

class Wiiboard:
    def __init__(self, processor):
        # Sockets and status
        self.receivesocket = None
        self.controlsocket = None

        self.processor = processor
        self.calibration = []
        self.calibrationRequested = False
        self.LED = False
        self.address = None
        self.buttonDown = False
        for i in xrange(3):
            self.calibration.append([])
            for j in xrange(4):
                self.calibration[i].append(10000)  # high dummy value so events with it don't register

        self.status = "Disconnected"
        self.lastEvent = BoardEvent(0, 0, 0, 0, False, False)

        try:
            self.receivesocket = bluetooth.BluetoothSocket(bluetooth.L2CAP)
            self.controlsocket = bluetooth.BluetoothSocket(bluetooth.L2CAP)
        except ValueError:
            raise Exception("Error: Bluetooth not found")

    def isConnected(self):
        return self.status == "Connected"

    # Connect to the Wiiboard at bluetooth address <address>
    def connect(self, address):
        if address is None:
            print "Non existant address"
            return
        self.receivesocket.connect((address, 0x13))
        self.controlsocket.connect((address, 0x11))
        if self.receivesocket and self.controlsocket:
            print "Connected to Wiiboard at address " + address
            self.status = "Connected"
            self.address = address
            self.calibrate()
            useExt = ["00", COMMAND_REGISTER, "04", "A4", "00", "40", "00"]
            self.send(useExt)
            self.setReportingType()
            print "Wiiboard connected"
        else:
            print "Could not connect to Wiiboard at address " + address

    def receive(self):
        while self.status == "Connected" and not self.processor.done:
            data = self.receivesocket.recv(25)
            intype = int(data.encode("hex")[2:4])
            if intype == INPUT_STATUS:
                # TODO: Status input received. It just tells us battery life really
                self.setReportingType()
            elif intype == INPUT_READ_DATA:
                if self.calibrationRequested:
                    packetLength = (int(str(data[4]).encode("hex"), 16) / 16 + 1)
                    self.parseCalibrationResponse(data[7:(7 + packetLength)])

                    if packetLength < 16:
                        self.calibrationRequested = False
            elif intype == EXTENSION_8BYTES:
                self.processor.mass(self.createBoardEvent(data[2:12]))
            else:
                print "ACK to data write received"

    def disconnect(self):
        if self.status == "Connected":
            self.status = "Disconnecting"
            while self.status == "Disconnecting":
                self.wait(100)
        try:
            self.receivesocket.close()
        except:
            pass
        try:
            self.controlsocket.close()
        except:
            pass
        print "WiiBoard disconnected"

    # Try to discover a Wiiboard
    def discover(self):
        print "Press the red sync button on the board now"
        address = None
        bluetoothdevices = bluetooth.discover_devices(duration=6, lookup_names=True)
        for bluetoothdevice in bluetoothdevices:
            if bluetoothdevice[1] == BLUETOOTH_NAME:
                address = bluetoothdevice[0]
                print "Found Wiiboard at address " + address
        if address is None:
            print "No Wiiboards discovered."
        return address

    def createBoardEvent(self, bytes):
        buttonBytes = bytes[0:2]
        bytes = bytes[2:12]
        buttonPressed = False
        buttonReleased = False

        state = (int(buttonBytes[0].encode("hex"), 16) << 8) | int(buttonBytes[1].encode("hex"), 16)
        if state == BUTTON_DOWN_MASK:
            buttonPressed = True
            if not self.buttonDown:
                print "Button pressed"
                self.buttonDown = True

        if not buttonPressed:
            if self.lastEvent.buttonPressed:
                buttonReleased = True
                self.buttonDown = False
                print "Button released"

        rawTR = (int(bytes[0].encode("hex"), 16) << 8) + int(bytes[1].encode("hex"), 16)
        rawBR = (int(bytes[2].encode("hex"), 16) << 8) + int(bytes[3].encode("hex"), 16)
        rawTL = (int(bytes[4].encode("hex"), 16) << 8) + int(bytes[5].encode("hex"), 16)
        rawBL = (int(bytes[6].encode("hex"), 16) << 8) + int(bytes[7].encode("hex"), 16)

        topLeft = self.calcMass(rawTL, TOP_LEFT)
        topRight = self.calcMass(rawTR, TOP_RIGHT)
        bottomLeft = self.calcMass(rawBL, BOTTOM_LEFT)
        bottomRight = self.calcMass(rawBR, BOTTOM_RIGHT)
        boardEvent = BoardEvent(topLeft, topRight, bottomLeft, bottomRight, buttonPressed, buttonReleased)
        return boardEvent

    def calcMass(self, raw, pos):
        val = 0.0
        #calibration[0] is calibration values for 0kg
        #calibration[1] is calibration values for 17kg
        #calibration[2] is calibration values for 34kg
        if raw < self.calibration[0][pos]:
            return val
        elif raw < self.calibration[1][pos]:
            val = 17 * ((raw - self.calibration[0][pos]) / float((self.calibration[1][pos] - self.calibration[0][pos])))
        elif raw > self.calibration[1][pos]:
            val = 17 + 17 * ((raw - self.calibration[1][pos]) / float((self.calibration[2][pos] - self.calibration[1][pos])))

        return val

    def getEvent(self):
        return self.lastEvent

    def getLED(self):
        return self.LED

    def parseCalibrationResponse(self, bytes):
        index = 0
        if len(bytes) == 16:
            for i in xrange(2):
                for j in xrange(4):
                    self.calibration[i][j] = (int(bytes[index].encode("hex"), 16) << 8) + int(bytes[index + 1].encode("hex"), 16)
                    index += 2
        elif len(bytes) < 16:
            for i in xrange(4):
                self.calibration[2][i] = (int(bytes[index].encode("hex"), 16) << 8) + int(bytes[index + 1].encode("hex"), 16)
                index += 2

    # Send <data> to the Wiiboard
    # <data> should be an array of strings, each string representing a single hex byte
    def send(self, data):
        if self.status != "Connected":
            return
        data[0] = "52"

        senddata = ""
        for byte in data:
            byte = str(byte)
            senddata += byte.decode("hex")

        self.controlsocket.send(senddata)

    #Turns the power button LED on if light is True, off if False
    #The board must be connected in order to set the light
    def setLight(self, light):
        if light:
            val = "10"
        else:
            val = "00"

        message = ["00", COMMAND_LIGHT, val]
        self.send(message)
        self.LED = light

    def calibrate(self):
        message = ["00", COMMAND_READ_REGISTER, "04", "A4", "00", "24", "00", "18"]
        self.send(message)
        self.calibrationRequested = True

    def setReportingType(self):
        bytearr = ["00", COMMAND_REPORTING, CONTINUOUS_REPORTING, EXTENSION_8BYTES]
        self.send(bytearr)

    def wait(self, millis):
        time.sleep(millis / 1000.0)


def main():
    processor = EventProcessor()

    board = Wiiboard(processor)
    address = (conf["BT-Adress"])

    try:
        # Disconnect already-connected devices.
        # This is basically Linux black magic just to get the thing to work.
        subprocess.check_output(["bluez-test-input", "disconnect", address], stderr=subprocess.STDOUT)
        subprocess.check_output(["bluez-test-input", "disconnect", address], stderr=subprocess.STDOUT)
    except:
        pass

    print "Trying to connect..."
    board.connect(address)  # The wii board must be in sync mode at this time
    board.wait(200)
    # Flash the LED so we know we can step on.
    board.setLight(False)
    board.wait(500)
    board.setLight(True)
    board.receive()

if __name__ == "__main__":
    main()

Mit

$ chmod 755 Gewicht.py

noch die Flags für Ausführbarkeit setzen

Links/Credits

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