Bonjour, j'ai acheter une station météo que l'on peut raccorder au pc via le port rs232. Comme mon pc ne possède pas de port rs232 j'ai acheter un cable usb 2 rs232. voici mon code:

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# -*- coding: iso-8859-1 -*-
 
import time
import serial
 
DELAY_CONST = 0.001
MAXRETRIES = 10
HISTORY_BUFFER_ADR = 0x1A0
HISTORY_REC_NO = 1796
SETBIT = 0x12
UNSETBIT = 0x32
 
DEBUG = 0
 
def debug(s, level = 2, tab = 0):
    if DEBUG >= level:
        print "	"*tab, s
 
def string2hex(s):
    return " ".join(map(lambda(x):hex(ord(x)), s))
 
class WS3500():
    def __init__(self, ser):
        self.ser = ser
        self._init = False
 
    def _initialize(self):
        debug("initialize()", level=1)
        buff = "U"*2000
 
        self.ser.write(buff)
 
        debug("-DTR", tab=1)
        self.ser.setDTR(0)
        debug("-RTS", tab=1)
        self.ser.setRTS(0)
 
        INIT_WAIT = 500
        i = 0
        while i < INIT_WAIT and not self.ser.getDSR():
            i += 1
            time.sleep(DELAY_CONST)
        if i == INIT_WAIT:
            debug("timeout 1", level=1)
            return 0
        i = 0
 
        time.sleep(DELAY_CONST)
        while i < INIT_WAIT and self.ser.getDSR():
            i += 1
            time.sleep(DELAY_CONST)
        if i != INIT_WAIT:
            debug("+RTS", tab=1)
            self.ser.setRTS(1)
            debug("+DTR", tab=1)
            self.ser.setDTR(1)
        else:
            debug("timeout 2", level=1)
            return 0
 
        self.ser.write(buff)
 
        self._init = True
 
        return 1
 
    def _read_safe(self, address, number):
        debug("read_safe(%i, %i)" % (address, number), level=1)
        readdata = ""
        readdata2 = ""
        nb_tests = 1
        for j in range(MAXRETRIES):
            self._write_data(address, 0, None, tab=1)
            readdata = self._read_data(number, tab=1)
 
            if nb_tests == 2:
                self._write_data(address, 0, None, tab=1)
                readdata2 = self._read_data(number, tab=1)
 
                if readdata == readdata2:
                    if readdata == chr(0) * number or readdata == "":
                        debug("--> only zeros", level=1, tab=1)
                        self._init = False
                        time.sleep(0.1)
                        self._initialize()
                    else:
                        break
                else:
                    debug("--> not identical", level=1, tab=1)
            else:
                if readdata == chr(0) * number or readdata == "":
                    debug("--> only zeros", level=1, tab=1)
                else:
                    break
 
        if j == MAXRETRIES:
            return -1
 
        return readdata
 
    def _read_data(self, number, tab=0):
        debug("read_data(%i)" % number, level=1, tab=tab)
        command = 0xa1
        readdata = ""
 
        if self._write_byte(command, tab=tab+1):
            for i in range(number):
                b = self._read_byte(tab=tab+1)
                readdata = readdata + chr(b)
                if i + 1 < number:
                    self._read_next_byte_seq(tab=tab+1)
 
            self._read_last_byte_seq(tab=tab+1)
 
            debug("--> %s" % string2hex(readdata), level=1, tab=tab)
 
            return readdata
        else:
            debug("--> erreur read_data", level=1, tab=tab)
            return ""
 
    def _write_data(self, address, number, writedata, tab=0):
        debug("write_data(%s, %i)" % (address, number), level=1, tab=tab)
        command = 0xa0
        i = -1
 
        self._write_byte(command, tab=tab+1)
        self._write_byte(address/256, tab=tab+1)
        self._write_byte(address%256, tab=tab+1)
 
        if writedata != None:
            for i in range(number):
                self._write_byte(ord(writedata[i]), tab=tab+1)
 
        debug("-DTR", tab=tab)
        self.ser.setDTR(0)
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
        debug("+RTS", tab=tab)
        self.ser.setRTS(1)
        debug("+DTR", tab=tab)
        self.ser.setDTR(1)
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
 
        return i
 
    def _read_next_byte_seq(self, tab=0):
        debug("read_next_byte_seq()", level=1, tab=tab)
        self._write_bit(0)
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
 
    def _read_last_byte_seq(self, tab=0):
        debug("read_last_byte_seq()", level=1, tab=tab)
        debug("+RTS", tab=tab)
        self.ser.setRTS(1)
        debug("-DTR", tab=tab)
        self.ser.setDTR(0)
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
        debug("+RTS", tab=tab)
        self.ser.setRTS(1)
        debug("+DTR", tab=tab)
        self.ser.setDTR(1)
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
 
    def _read_bit(self, tab=0):
        debug("read_bit()", level=1, tab=tab)
        debug("-DTR", tab=tab)
        self.ser.setDTR(0)
        status = self.ser.getCTS()
        debug("CTS ->" + str(status), tab=tab)
        debug("+DTR", tab=tab)
        self.ser.setDTR(1)
 
        debug("--> %i" % int(not status), level=1, tab=tab)
 
        return int(not status)
 
    def _write_bit(self, bit, tab=0):
        debug("write_bit(%i)" % bit, level=1, tab=tab)
        if bit:
            debug("->-RTS", tab=tab)
            self.ser.setRTS(0)
        else:
            debug("->+RTS", tab=tab)
            self.ser.setRTS(1)
        debug("-DTR", tab=tab)
        self.ser.setDTR(0)
        debug("+DTR", tab=tab)
        self.ser.setDTR(1)
 
    def _read_byte(self, tab=0):
        debug("read_byte()", level=1, tab=tab)
        byte = 0
 
        for i in range(8):
            byte *= 2
            byte += self._read_bit(tab=tab+1)
 
        debug("--> %i - %s" % (byte, hex(byte)), level=1, tab=tab)
 
        return byte
 
    def _write_byte(self, byte, tab=0):
        debug("write_byte(%i)" % byte, level=1, tab=tab)
        for i in range(8):
            self._write_bit(byte & 0x80, tab=tab+1)
            byte <<= 1
            byte &= 0xff
 
        debug("-RTS", tab=tab)
        self.ser.setRTS(0)
        status = self.ser.getCTS()
        debug("CTS->" + str(status), tab=tab)
        debug("-DTR", tab=tab)
        self.ser.setDTR(0)
        debug("+DTR", tab=tab)
        self.ser.setDTR(1)
        debug("---> %i" % int(status), level=1, tab=tab)
        if status:
            return 1
        else:
            return 0
 
    def conv_temp(self, data):
        return ((ord(data[1]) & 0xF) * 10 + (ord(data[0]) >> 4) + (ord(data[0]) & 0xF) / 10.0) - 40.0
 
    def conv_datetime(self, data):
        minute = (ord(data[0]) >> 4) + (ord(data[1]) & 0xF) * 10
        heure = (ord(data[1]) >> 4) + (ord(data[2]) & 0xF) * 10
        jour = (ord(data[2]) >> 4) + (ord(data[3]) & 0xF) * 10
        mois = (ord(data[3]) >> 4) + (ord(data[4]) & 0xF) * 10
        annee = 2000 + (ord(data[4]) >> 4) + (ord(data[5]) & 0xF) * 10
        return "%04i-%02i-%02i %02i:%02i" % (annee, mois, jour, heure, minute)
 
    def conv_datetime2(self, data):
        minute = (ord(data[0]) >> 4) * 10 + (ord(data[0]) & 0xF)
        heure = (ord(data[1]) >> 4) * 10 + (ord(data[1]) & 0xF)
        jour = (ord(data[2]) >> 4) * 10 + (ord(data[2]) & 0xF)
        mois = (ord(data[3]) >> 4) * 10 + (ord(data[3]) & 0xF)
        annee = 2000 + (ord(data[4]) >> 4) * 10 + (ord(data[4]) & 0xF)
        return "%04i-%02i-%02i %02i:%02i" % (annee, mois, jour, heure, minute)
 
    def getTemp(self, address, meteo_data = None):
        l = 2
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return self.conv_temp(data_read)
 
    def getTempBCD(self, address, meteo_data = None):
        l = 2
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return (ord(data_read[1]) >> 4) * 10 + (ord(data_read[1] )& 0xF) + (ord(data_read[0]) >> 4) / 10.0 - 40.0
 
    def getDateTime(self, address, meteo_data = None):
        l = 6
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return self.conv_datetime(data_read)
 
    def getDateTime2(self, address, meteo_data = None):
        l = 5
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return self.conv_datetime2(data_read)
 
    def getHumidity(self, address, meteo_data = None):
        l = 1
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return (ord(data_read[0]) >> 4) * 10 + (ord(data_read[0]) & 0xf)
 
    def getPressure(self, address, meteo_data = None):
        l = 3
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return (ord(data_read[2]) & 0xF) * 1000 + (ord(data_read[1]) >> 4) * 100 + (ord(data_read[1]) & 0xF) * 10 + (ord(data_read[0]) >> 4) + (ord(data_read[0]) & 0xF) / 10.0
 
    def temp_int(self, meteo_data = None):
        address = 0x26
 
        return self.getTemp(address, meteo_data)
 
    def temp_ext(self, meteo_data = None):
        address = 0x3D
 
        return self.getTemp(address, meteo_data)
 
    def temperature_indoor_minmax(self, meteo_data = None):
        address_min = 0x28
        address_max = 0x2B
        address_mintime = 0x2C
        address_maxtime = 0x31
 
        data = []
        data.append(self.getTempBCD(address_min, meteo_data))
        data.append(self.getTemp(address_max, meteo_data))
        data.append(self.getDateTime(address_mintime, meteo_data))
        data.append(self.getDateTime(address_maxtime, meteo_data))
 
        return data
 
    def temperature_outdoor_minmax(self, meteo_data = None):
        address_min = 0x3F
        address_max = 0x42
        address_mintime = 0x43
        address_maxtime = 0x48
 
        data = []
        data.append(self.getTempBCD(address_min, meteo_data))
        data.append(self.getTemp(address_max, meteo_data))
        data.append(self.getDateTime(address_mintime, meteo_data))
        data.append(self.getDateTime(address_maxtime, meteo_data))
 
        return data
 
    def dewpoint(self, meteo_data = None):
        address = 0x6B
 
        return self.getTemp(address, meteo_data)
 
    def dewpoint_minmax(self, meteo_data = None):
        address_min = 0x6D
        address_max = 0x70
        address_mintime = 0x71
        address_maxtime = 0x76
 
        data = []
        data.append(self.getTempBCD(address_min, meteo_data))
        data.append(self.getTemp(address_max, meteo_data))
        data.append(self.getDateTime(address_mintime, meteo_data))
        data.append(self.getDateTime(address_maxtime, meteo_data))
 
        return data
 
    def humidity_indoor(self, meteo_data = None):
        address = 0x81
 
        return self.getHumidity(address, meteo_data)
 
    def humidity_outdoor(self, meteo_data = None):
        address = 0x90
 
        return self.getHumidity(address, meteo_data)
 
    def humidity_indoor_minmax(self, meteo_data = None):
        address_min = 0x82
        address_max = 0x83
        address_mintime = 0x84
        address_maxtime = 0x89
 
        data = []
        data.append(self.getHumidity(address_min, meteo_data))
        data.append(self.getHumidity(address_max, meteo_data))
        data.append(self.getDateTime2(address_mintime, meteo_data))
        data.append(self.getDateTime2(address_maxtime, meteo_data))
 
        return data
 
    def humidity_outdoor_minmax(self, meteo_data = None):
        address_min = 0x91
        address_max = 0x92
        address_mintime = 0x93
        address_maxtime = 0x98
 
        data = []
        data.append(self.getHumidity(address_min, meteo_data))
        data.append(self.getHumidity(address_max, meteo_data))
        data.append(self.getDateTime2(address_mintime, meteo_data))
        data.append(self.getDateTime2(address_maxtime, meteo_data))
 
        return data
 
    def rel_pressure(self, meteo_data = None):
        address = 0x13D
 
        return self.getPressure(address, meteo_data)
 
    def rel_pressure_minmax(self, meteo_data = None):
        address_min = 0x156
        address_max = 0x14C
        address_mintime = 0x160
        address_maxtime = 0x15B
 
        data = []
        data.append(self.getPressure(address_min, meteo_data))
        data.append(self.getPressure(address_max, meteo_data))
        data.append(self.getDateTime2(address_mintime, meteo_data))
        data.append(self.getDateTime2(address_maxtime, meteo_data))
 
        return data
 
    def abs_pressure(self, meteo_data = None):
        address = 0x138
 
        return self.getPressure(address, meteo_data)
 
    def abs_pressure_minmax(self, meteo_data = None):
        address_min = 0x5F6
        address_max = 0x5F6 + 12
        address_mintime = 0x61E
        address_maxtime = 0x61E + 5
 
        data = []
        data.append(self.getPressure(address_min, meteo_data))
        data.append(self.getPressure(address_max, meteo_data))
        data.append(self.getDateTime2(address_mintime, meteo_data))
        data.append(self.getDateTime2(address_maxtime, meteo_data))
 
        return data
 
    def tendency_forecast(self, meteo_data = None):
        address = 0x24
        l = 1
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        tendency_values = ["Constant", "Augmentant", "Diminuant"]
        forecast_values = ["Pluvieux", "Nuageux", "Ensoleillé"]
 
        return tendency_values[ord(data_read[0]) >> 4], forecast_values[ord(data_read[0]) & 0xF]
 
    def read_history_info(self):
        if not self._init:
            if not self._initialize():
                return ""
        address = 0x6B2 - 2
        l = 12
        data_read = self._read_safe(address, l)
 
        debug(string2hex(data_read), 1)
 
        data = []
 
        interval = (ord(data_read[1]) & 0xF) * 256 + ord(data_read[0]) + 1
        data.append(interval)
        countdown = ord(data_read[2])*16 + (ord(data_read[1]) >> 4) + 1
        data.append(countdown)
 
        jour = (ord(data_read[0]) >> 4) * 10 + (ord(data_read[0]) & 0xF)
        mois = (ord(data_read[1]) >> 4) * 10 + (ord(data_read[1]) & 0xF)
        annee = 2000 + (ord(data_read[2]) >> 4) * 10 + (ord(data_read[2]) & 0xF)
        data.append((jour, mois, annee))
        no_records = ord(data_read[9])
        data.append(no_records)
 
        return data
 
    def read_history_record(self, data, record_no):
        record = data
 
        minute = ((ord(record[0]) & 0xf0) >> 4)* 10 + (ord(record[0]) & 0xf)
        if minute >= 60:
            return None
        heure = ((ord(record[1]) & 0xf0) >> 4) * 10 + (ord(record[1]) & 0xf)
        jour = ((ord(record[2]) & 0xf0) >> 4) * 10 + (ord(record[2]) & 0xf)
        mois = ((ord(record[3]) & 0xf0) >> 4) * 10 + (ord(record[3]) & 0xf)
        annee = 2000 + ((ord(record[4]) & 0xf0) >> 4) * 10 + (ord(record[4]) & 0xf)
 
        temperature_indoor = ((ord(record[5]) & 0xf0) >> 4) * 10 + (ord(record[5]) & 0xf)
        temperature_indoor += (ord(record[6]) & 0xf) * 100 - 400
        ##temperature_indoor /= 10.0
        temperature_outdoor = (ord(record[6]) & 0xf0) >> 4
        temperature_outdoor += ((ord(record[7]) & 0xf0) >> 4) * 100 + (ord(record[7]) & 0xf) * 10 - 400
        ##temperature_outdoor /= 10.0
        pressure = ((ord(record[8]) & 0xf0) >> 4) * 10 + (ord(record[8]) & 0xf)
        pressure += ((ord(record[9]) & 0xf0) >> 4) * 1000 + (ord(record[9]) & 0xf) * 100
        pressure += (ord(record[10]) & 0xf) * 10000
        ##pressure /= 10.0
        humidity_indoor = (ord(record[10]) & 0xf0) >> 4
        humidity_indoor += (ord(record[11]) & 0xf) * 10
        humidity_outdoor = (ord(record[11]) & 0xf0) >> 4
        humidity_outdoor += (ord(record[12]) & 0xf) * 10
        raincount = ord(record[12]) >> 4
        raincount += ord(record[13]) * 16
        windspeed = (ord(record[15]) & 0xf) * 256 + ord(record[14])
        ##windspeed /= 10.0
        if (ord(record[17]) & 0xf) != 1 or ord(record[16]) != 0xFE:
            windgust = (ord(record[17]) & 0xf) * 256 + ord(record[16])
            ##windgust /= 10.0
        else:
            windgust = -1
        winddir_degrees = ((ord(record[15]) & 0xF0)>> 4) * 22.5
 
        return ["%04i-%02i-%02i %02i:%02i" % (annee, mois, jour, heure, minute), temperature_indoor, temperature_outdoor, pressure, humidity_indoor, humidity_outdoor, raincount, windspeed, winddir_degrees]
 
    def read_history(self, delai_dernier_releve = 0):
        if not self._init:
            if not self._initialize():
                return ""
        l = 0x7fff - HISTORY_BUFFER_ADR + 1
        nb = 12 * 5 * 20
        l = 18 * nb
        nb_enreg_max = 1750
        address_max = HISTORY_BUFFER_ADR + nb_enreg_max * 18 - 1
        address = HISTORY_BUFFER_ADR
        end_of_data = False
        data = []
        j = 0
        last_record = None
        while not end_of_data and j < MAXRETRIES:
            nb_ok = 0
            j += 1
            debug("read history from address : %s" % hex(address), 1)
            if l + address > address_max:
                l = address_max - address + 1
            if l > 0:
                data_read = self._read_safe(address, l)
 
 
            if data_read:
                for i in range(nb):##range(HISTORY_REC_NO):
                    try:
                        record = None
                        record = self.read_history_record(data_read[i*18:(i+1)*18], i)
                    except Exception, e:
                        print "exception :", e, i, string2hex(data_read[i*18:(i+1)*18])
                        record = None
                    if record is None:
                        end_of_data = False
                        break
                    else:
                        last_record = record
                        nb_ok += 1
                    data.append(record)
 
                address += 18 * nb_ok
                if last_record and delai_dernier_releve > 0 :
                    try:
                        if DateTime.DateTimeFrom(last_record[0]) + DateTime.RelativeDateTime(minutes = delai_dernier_releve) > DateTime.now():
                            end_of_data = True
                    except:
                        pass
            else:
                debug("no data read", 1)
                end_of_data = False
 
        return data
 
    def recording_interval(self, meteo_data = None):
        ## returned value by the station :
        ##   0 - 1 min
        ##   1 - 5 min
        ##   2 - 10 min
        ##   3 - 15 min
        ##   4 - 20 min
        ##   5 - 30 min
        ##   6 - 60 min
        ##   7 - 2 hours
        ##   8 - 3 hours
        ##   9 - 4 hours
        ##   A - 6 hours
        ##   B - 8 hours
        ##   C - 12 hours
        ##   D - 24 hours
        duree = {0 : 1,
                 1 : 5,
                 2 : 10,
                 3 : 15,
                 4 : 20,
                 5 : 30,
                 6 : 60,
                 7 : 120,
                 8 : 180,
                 9 : 240,
                 0xa : 360,
                 0xb : 480,
                 0xc : 720,
                 0xd : 1440}
        l = 1
        address = 0xE3
        if meteo_data is None:
            if not self._init:
                if not self._initialize():
                    return ""
            data_read = self._read_safe(address, l)
        else:
            data_read = meteo_data[address:address+l]
 
        return duree[ord(data_read[0]) >> 4]
 
    def load_main_data(self):
        if not self._init:
            if not self._initialize():
                return ""
        address = 0x00
        l = 0x16F
        data_read = self._read_safe(address, l)
 
        return data_read
 
    def light(self, active):
        ## Doesn't work
        if not self._init:
            if not self._initialize():
                return ""
        address = 0x16
        l = 1
        if active:
            writedata = chr(SETBIT)
        else:
            writedata = chr(UNSETBIT)
        self._write_data(address, l, writedata, tab=1)
 
 
 
if __name__ == "__main__":
    ser = serial.Serial('/dev/ttyUSB0')
    try:
        ws = WS3500(ser)
        meteo_data = ws.load_main_data()
        if meteo_data:
            t_int = ws.temp_int(meteo_data)
            print "T° int :", t_int
            if 1000 > 100:
 
                print "T° ext :", ws.temp_ext(meteo_data)
                l = ws.temperature_indoor_minmax(meteo_data)
                print "intérieur :"
                print "T° min :", l[0], " à ", l[2], "T° max :", l[1], " à ", l[3]
                l = ws.temperature_outdoor_minmax(meteo_data)
                print "extérieur :"
                print "T° min :", l[0], " à ", l[2], "T° max :", l[1], " à ", l[3]
                print "Point de rosée :", ws.dewpoint(meteo_data)
                l = ws.dewpoint_minmax(meteo_data)
                print "T° min :", l[0], " à ", l[2], "T° max :", l[1], " à ", l[3]
                print "Humidité int :", ws.humidity_indoor(meteo_data)
                print "Humidité ext :", ws.humidity_outdoor(meteo_data)
                l = ws.humidity_indoor_minmax(meteo_data)
                print "intérieur :"
                print "Humidité min :", l[0], " à ", l[2], "Humidité max :", l[1], " à ", l[3]
                l = ws.humidity_outdoor_minmax(meteo_data)
                print "extérieur :"
                print "Humidité min :", l[0], " à ", l[2], "Humidité max :", l[1], " à ", l[3]
                tendency, forecast = ws.tendency_forecast(meteo_data)
                tendency_values = ["Constant", "Augmentant", "Diminuant"]
                forecast_values = ["Pluvieux", "Nuageux", "Ensoleillé"]
                print "Prévisions :", tendency_values[tendency], "et", forecast_values[forecast]
                print "Prel int :", ws.rel_pressure(meteo_data)
                l = ws.rel_pressure_minmax(meteo_data)
                print "Prel min :", l[0], " à ", l[2], "Prel max :", l[1], " à ", l[3]
                print "Pabs int :", ws.abs_pressure(meteo_data)
                l = ws.abs_pressure_minmax()
                print "Pabs min :", l[0], " à ", l[2], "Pabs max :", l[1], " à ", l[3]
                interval = ws.recording_interval(meteo_data)
                print "Recording interval :", interval, "min"
    except serial.SerialException, e:
        print "SerialException :", e
    except Exception, e:
        print "Exception :", e
    finally:
        ser.close()
et voici ma réponse:



d'où sort ce chiffre ?