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yocto_temperature.py
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#*********************************************************************
#*
#* $Id: yocto_temperature.py 23527 2016-03-18 21:49:19Z mvuilleu $
#*
#* Implements yFindTemperature(), the high-level API for Temperature functions
#*
#* - - - - - - - - - License information: - - - - - - - - -
#*
#* Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
#*
#* Yoctopuce Sarl (hereafter Licensor) grants to you a perpetual
#* non-exclusive license to use, modify, copy and integrate this
#* file into your software for the sole purpose of interfacing
#* with Yoctopuce products.
#*
#* You may reproduce and distribute copies of this file in
#* source or object form, as long as the sole purpose of this
#* code is to interface with Yoctopuce products. You must retain
#* this notice in the distributed source file.
#*
#* You should refer to Yoctopuce General Terms and Conditions
#* for additional information regarding your rights and
#* obligations.
#*
#* THE SOFTWARE AND DOCUMENTATION ARE PROVIDED 'AS IS' WITHOUT
#* WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
#* WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS
#* FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO
#* EVENT SHALL LICENSOR BE LIABLE FOR ANY INCIDENTAL, SPECIAL,
#* INDIRECT OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA,
#* COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR
#* SERVICES, ANY CLAIMS BY THIRD PARTIES (INCLUDING BUT NOT
#* LIMITED TO ANY DEFENSE THEREOF), ANY CLAIMS FOR INDEMNITY OR
#* CONTRIBUTION, OR OTHER SIMILAR COSTS, WHETHER ASSERTED ON THE
#* BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF
#* WARRANTY, OR OTHERWISE.
#*
#*********************************************************************/
__docformat__ = 'restructuredtext en'
from yocto_api import *
#--- (YTemperature class start)
#noinspection PyProtectedMember
class YTemperature(YSensor):
"""
The Yoctopuce class YTemperature allows you to read and configure Yoctopuce temperature
sensors. It inherits from YSensor class the core functions to read measurements,
register callback functions, access to the autonomous datalogger.
This class adds the ability to configure some specific parameters for some
sensors (connection type, temperature mapping table).
"""
#--- (end of YTemperature class start)
#--- (YTemperature return codes)
#--- (end of YTemperature return codes)
#--- (YTemperature dlldef)
#--- (end of YTemperature dlldef)
#--- (YTemperature definitions)
SIGNALVALUE_INVALID = YAPI.INVALID_DOUBLE
SIGNALUNIT_INVALID = YAPI.INVALID_STRING
COMMAND_INVALID = YAPI.INVALID_STRING
SENSORTYPE_DIGITAL = 0
SENSORTYPE_TYPE_K = 1
SENSORTYPE_TYPE_E = 2
SENSORTYPE_TYPE_J = 3
SENSORTYPE_TYPE_N = 4
SENSORTYPE_TYPE_R = 5
SENSORTYPE_TYPE_S = 6
SENSORTYPE_TYPE_T = 7
SENSORTYPE_PT100_4WIRES = 8
SENSORTYPE_PT100_3WIRES = 9
SENSORTYPE_PT100_2WIRES = 10
SENSORTYPE_RES_OHM = 11
SENSORTYPE_RES_NTC = 12
SENSORTYPE_RES_LINEAR = 13
SENSORTYPE_INVALID = -1
#--- (end of YTemperature definitions)
def __init__(self, func):
super(YTemperature, self).__init__(func)
self._className = 'Temperature'
#--- (YTemperature attributes)
self._callback = None
self._sensorType = YTemperature.SENSORTYPE_INVALID
self._signalValue = YTemperature.SIGNALVALUE_INVALID
self._signalUnit = YTemperature.SIGNALUNIT_INVALID
self._command = YTemperature.COMMAND_INVALID
#--- (end of YTemperature attributes)
#--- (YTemperature implementation)
def _parseAttr(self, member):
if member.name == "sensorType":
self._sensorType = member.ivalue
return 1
if member.name == "signalValue":
self._signalValue = round(member.ivalue * 1000.0 / 65536.0) / 1000.0
return 1
if member.name == "signalUnit":
self._signalUnit = member.svalue
return 1
if member.name == "command":
self._command = member.svalue
return 1
super(YTemperature, self)._parseAttr(member)
def set_unit(self, newval):
"""
Changes the measuring unit for the measured temperature. That unit is a string.
If that strings end with the letter F all temperatures values will returned in
Fahrenheit degrees. If that String ends with the letter K all values will be
returned in Kelvin degrees. If that string ends with the letter C all values will be
returned in Celsius degrees. If the string ends with any other character the
change will be ignored. Remember to call the
saveToFlash() method of the module if the modification must be kept.
WARNING: if a specific calibration is defined for the temperature function, a
unit system change will probably break it.
@param newval : a string corresponding to the measuring unit for the measured temperature
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
rest_val = newval
return self._setAttr("unit", rest_val)
def get_sensorType(self):
"""
Returns the temperature sensor type.
@return a value among YTemperature.SENSORTYPE_DIGITAL, YTemperature.SENSORTYPE_TYPE_K,
YTemperature.SENSORTYPE_TYPE_E, YTemperature.SENSORTYPE_TYPE_J, YTemperature.SENSORTYPE_TYPE_N,
YTemperature.SENSORTYPE_TYPE_R, YTemperature.SENSORTYPE_TYPE_S, YTemperature.SENSORTYPE_TYPE_T,
YTemperature.SENSORTYPE_PT100_4WIRES, YTemperature.SENSORTYPE_PT100_3WIRES,
YTemperature.SENSORTYPE_PT100_2WIRES, YTemperature.SENSORTYPE_RES_OHM,
YTemperature.SENSORTYPE_RES_NTC and YTemperature.SENSORTYPE_RES_LINEAR corresponding to the
temperature sensor type
On failure, throws an exception or returns YTemperature.SENSORTYPE_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YTemperature.SENSORTYPE_INVALID
return self._sensorType
def set_sensorType(self, newval):
"""
Modifies the temperature sensor type. This function is used
to define the type of thermocouple (K,E...) used with the device.
It has no effect if module is using a digital sensor or a thermistor.
Remember to call the saveToFlash() method of the module if the
modification must be kept.
@param newval : a value among YTemperature.SENSORTYPE_DIGITAL, YTemperature.SENSORTYPE_TYPE_K,
YTemperature.SENSORTYPE_TYPE_E, YTemperature.SENSORTYPE_TYPE_J, YTemperature.SENSORTYPE_TYPE_N,
YTemperature.SENSORTYPE_TYPE_R, YTemperature.SENSORTYPE_TYPE_S, YTemperature.SENSORTYPE_TYPE_T,
YTemperature.SENSORTYPE_PT100_4WIRES, YTemperature.SENSORTYPE_PT100_3WIRES,
YTemperature.SENSORTYPE_PT100_2WIRES, YTemperature.SENSORTYPE_RES_OHM,
YTemperature.SENSORTYPE_RES_NTC and YTemperature.SENSORTYPE_RES_LINEAR
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
rest_val = str(newval)
return self._setAttr("sensorType", rest_val)
def get_signalValue(self):
"""
Returns the current value of the electrical signal measured by the sensor.
@return a floating point number corresponding to the current value of the electrical signal
measured by the sensor
On failure, throws an exception or returns YTemperature.SIGNALVALUE_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YTemperature.SIGNALVALUE_INVALID
return round(self._signalValue * 1000) / 1000
def get_signalUnit(self):
"""
Returns the measuring unit of the electrical signal used by the sensor.
@return a string corresponding to the measuring unit of the electrical signal used by the sensor
On failure, throws an exception or returns YTemperature.SIGNALUNIT_INVALID.
"""
if self._cacheExpiration == datetime.datetime.fromtimestamp(0):
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YTemperature.SIGNALUNIT_INVALID
return self._signalUnit
def get_command(self):
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YTemperature.COMMAND_INVALID
return self._command
def set_command(self, newval):
rest_val = newval
return self._setAttr("command", rest_val)
@staticmethod
def FindTemperature(func):
"""
Retrieves a temperature sensor for a given identifier.
The identifier can be specified using several formats:
<ul>
<li>FunctionLogicalName</li>
<li>ModuleSerialNumber.FunctionIdentifier</li>
<li>ModuleSerialNumber.FunctionLogicalName</li>
<li>ModuleLogicalName.FunctionIdentifier</li>
<li>ModuleLogicalName.FunctionLogicalName</li>
</ul>
This function does not require that the temperature sensor is online at the time
it is invoked. The returned object is nevertheless valid.
Use the method YTemperature.isOnline() to test if the temperature sensor is
indeed online at a given time. In case of ambiguity when looking for
a temperature sensor by logical name, no error is notified: the first instance
found is returned. The search is performed first by hardware name,
then by logical name.
@param func : a string that uniquely characterizes the temperature sensor
@return a YTemperature object allowing you to drive the temperature sensor.
"""
# obj
obj = YFunction._FindFromCache("Temperature", func)
if obj is None:
obj = YTemperature(func)
YFunction._AddToCache("Temperature", func, obj)
return obj
def set_ntcParameters(self, res25, beta):
"""
Configure NTC thermistor parameters in order to properly compute the temperature from
the measured resistance. For increased precision, you can enter a complete mapping
table using set_thermistorResponseTable. This function can only be used with a
temperature sensor based on thermistors.
@param res25 : thermistor resistance at 25 degrees Celsius
@param beta : Beta value
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
# t0
# t1
# res100
tempValues = []
resValues = []
t0 = 25.0+275.15
t1 = 100.0+275.15
res100 = res25 * exp(beta*(1.0/t1 - 1.0/t0))
del tempValues[:]
del resValues[:]
tempValues.append(25.0)
resValues.append(res25)
tempValues.append(100.0)
resValues.append(res100)
return self.set_thermistorResponseTable(tempValues, resValues)
def set_thermistorResponseTable(self, tempValues, resValues):
"""
Records a thermistor response table, in order to interpolate the temperature from
the measured resistance. This function can only be used with a temperature
sensor based on thermistors.
@param tempValues : array of floating point numbers, corresponding to all
temperatures (in degrees Celcius) for which the resistance of the
thermistor is specified.
@param resValues : array of floating point numbers, corresponding to the resistance
values (in Ohms) for each of the temperature included in the first
argument, index by index.
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
# siz
# res
# idx
# found
# prev
# curr
# currTemp
# idxres
siz = len(tempValues)
if not (siz >= 2):
self._throw(YAPI.INVALID_ARGUMENT, "thermistor response table must have at least two points")
if not (siz == len(resValues)):
self._throw(YAPI.INVALID_ARGUMENT, "table sizes mismatch")
# // may throw an exception
res = self.set_command("Z")
if not (res==YAPI.SUCCESS):
self._throw(YAPI.IO_ERROR, "unable to reset thermistor parameters")
# // add records in growing resistance value
found = 1
prev = 0.0
while found > 0:
found = 0
curr = 99999999.0
currTemp = -999999.0
idx = 0
while idx < siz:
idxres = resValues[idx]
if (idxres > prev) and (idxres < curr):
curr = idxres
currTemp = tempValues[idx]
found = 1
idx = idx + 1
if found > 0:
res = self.set_command("m" + str(int(round(1000*curr))) + ":" + str(int(round(1000*currTemp))))
if not (res==YAPI.SUCCESS):
self._throw(YAPI.IO_ERROR, "unable to reset thermistor parameters")
prev = curr
return YAPI.SUCCESS
def loadThermistorResponseTable(self, tempValues, resValues):
"""
Retrieves the thermistor response table previously configured using the
set_thermistorResponseTable function. This function can only be used with a
temperature sensor based on thermistors.
@param tempValues : array of floating point numbers, that is filled by the function
with all temperatures (in degrees Celcius) for which the resistance
of the thermistor is specified.
@param resValues : array of floating point numbers, that is filled by the function
with the value (in Ohms) for each of the temperature included in the
first argument, index by index.
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
# id
# bin_json
paramlist = []
templist = []
# siz
# idx
# temp
# found
# prev
# curr
# currRes
del tempValues[:]
del resValues[:]
# // may throw an exception
id = self.get_functionId()
id = (id)[11: 11 + len(id) - 11]
bin_json = self._download("extra.json?page=" + id)
paramlist = self._json_get_array(bin_json)
# // first convert all temperatures to float
siz = ((len(paramlist)) >> (1))
del templist[:]
idx = 0
while idx < siz:
temp = float(paramlist[2*idx+1])/1000.0
templist.append(temp)
idx = idx + 1
# // then add records in growing temperature value
del tempValues[:]
del resValues[:]
found = 1
prev = -999999.0
while found > 0:
found = 0
curr = 999999.0
currRes = -999999.0
idx = 0
while idx < siz:
temp = templist[idx]
if (temp > prev) and (temp < curr):
curr = temp
currRes = float(paramlist[2*idx])/1000.0
found = 1
idx = idx + 1
if found > 0:
tempValues.append(curr)
resValues.append(currRes)
prev = curr
return YAPI.SUCCESS
def nextTemperature(self):
"""
Continues the enumeration of temperature sensors started using yFirstTemperature().
@return a pointer to a YTemperature object, corresponding to
a temperature sensor currently online, or a None pointer
if there are no more temperature sensors to enumerate.
"""
hwidRef = YRefParam()
if YAPI.YISERR(self._nextFunction(hwidRef)):
return None
if hwidRef.value == "":
return None
return YTemperature.FindTemperature(hwidRef.value)
#--- (end of YTemperature implementation)
#--- (Temperature functions)
@staticmethod
def FirstTemperature():
"""
Starts the enumeration of temperature sensors currently accessible.
Use the method YTemperature.nextTemperature() to iterate on
next temperature sensors.
@return a pointer to a YTemperature object, corresponding to
the first temperature sensor currently online, or a None pointer
if there are none.
"""
devRef = YRefParam()
neededsizeRef = YRefParam()
serialRef = YRefParam()
funcIdRef = YRefParam()
funcNameRef = YRefParam()
funcValRef = YRefParam()
errmsgRef = YRefParam()
size = YAPI.C_INTSIZE
#noinspection PyTypeChecker,PyCallingNonCallable
p = (ctypes.c_int * 1)()
err = YAPI.apiGetFunctionsByClass("Temperature", 0, p, size, neededsizeRef, errmsgRef)
if YAPI.YISERR(err) or not neededsizeRef.value:
return None
if YAPI.YISERR(
YAPI.yapiGetFunctionInfo(p[0], devRef, serialRef, funcIdRef, funcNameRef, funcValRef, errmsgRef)):
return None
return YTemperature.FindTemperature(serialRef.value + "." + funcIdRef.value)
#--- (end of Temperature functions)

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