Source code for sensirion_shdlc_sfa3x.commands.read_measured_values
# -*- coding: utf-8 -*-
# (c) Copyright 2021 Sensirion AG, Switzerland
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#
# THIS FILE IS AUTOMATICALLY GENERATED AND MUST NOT BE EDITED MANUALLY!
#
# Generator: sensirion-shdlc-interface-generator 0.8.1
# Product: SFA3x
# Version: 0.1.0
#
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# flake8: noqa
from __future__ import absolute_import, division, print_function
from sensirion_shdlc_driver.command import ShdlcCommand
from struct import pack, unpack
import logging
log = logging.getLogger(__name__)
[docs]class Sfa3xCmdReadMeasuredValuesBase(ShdlcCommand):
"""
SHDLC command 0x03: "Read Measured Values".
"""
[docs] def __init__(self, *args, **kwargs):
"""
Constructor.
"""
super(Sfa3xCmdReadMeasuredValuesBase, self).__init__(
0x03, *args, **kwargs)
[docs]class Sfa3xCmdReadMeasuredValuesOutputFormat2(Sfa3xCmdReadMeasuredValuesBase):
"""
Read Measured Values Output Format 2 Command
Read measured values integer.
"""
[docs] def __init__(self):
"""
Constructor.
"""
super(Sfa3xCmdReadMeasuredValuesOutputFormat2, self).__init__(
data=b"".join([bytes(bytearray([0x02]))]),
max_response_time=0.1,
post_processing_time=0.0,
min_response_length=6,
max_response_length=6
)
[docs] @staticmethod
def interpret_response(data):
"""
:return:
- hcho (int) -
Formaldehyde concentration in ppb as a 16-bit signed integer.
Positive values only, negative values are coerced to zero. Scale
factor 5 ppb^(-1).
- relative_humidity (int) -
Relative humidity in %. Values between 0 and 100 only. With
internal correction for temperature offset (if configured). Scale
factor 100 %^(-1).
- temperature (int) -
Temperature in °C. With internal correction for temperature
offset (if configured). Scale factor 200 °C^(-1).
:rtype: tuple
"""
hcho = int(unpack(">h", data[0:2])[0]) # int16
relative_humidity = int(unpack(">h", data[2:4])[0]) # int16
temperature = int(unpack(">h", data[4:6])[0]) # int16
return hcho,\
relative_humidity,\
temperature