Update to new build process and turn on lint.

.gitignore

@@ -2,3 +2,6 @@ __pycache__
 _build
 *.pyc
 *.mpy
+.env
+build*
+bundles

.pylintrc

@@ -0,0 +1,433 @@
+[MASTER]
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code
+extension-pkg-whitelist=
+
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=CVS
+
+# Add files or directories matching the regex patterns to the blacklist. The
+# regex matches against base names, not paths.
+ignore-patterns=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Use multiple processes to speed up Pylint.
+# jobs=1
+jobs=2
+
+# List of plugins (as comma separated values of python modules names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# Specify a configuration file.
+#rcfile=
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED
+confidence=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once).You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use"--disable=all --enable=classes
+# --disable=W"
+# disable=import-error,print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call
+disable=print-statement,parameter-unpacking,unpacking-in-except,old-raise-syntax,backtick,long-suffix,old-ne-operator,old-octal-literal,import-star-module-level,raw-checker-failed,bad-inline-option,locally-disabled,locally-enabled,file-ignored,suppressed-message,useless-suppression,deprecated-pragma,apply-builtin,basestring-builtin,buffer-builtin,cmp-builtin,coerce-builtin,execfile-builtin,file-builtin,long-builtin,raw_input-builtin,reduce-builtin,standarderror-builtin,unicode-builtin,xrange-builtin,coerce-method,delslice-method,getslice-method,setslice-method,no-absolute-import,old-division,dict-iter-method,dict-view-method,next-method-called,metaclass-assignment,indexing-exception,raising-string,reload-builtin,oct-method,hex-method,nonzero-method,cmp-method,input-builtin,round-builtin,intern-builtin,unichr-builtin,map-builtin-not-iterating,zip-builtin-not-iterating,range-builtin-not-iterating,filter-builtin-not-iterating,using-cmp-argument,eq-without-hash,div-method,idiv-method,rdiv-method,exception-message-attribute,invalid-str-codec,sys-max-int,bad-python3-import,deprecated-string-function,deprecated-str-translate-call,import-error
+
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where
+# it should appear only once). See also the "--disable" option for examples.
+enable=
+
+
+[REPORTS]
+
+# Python expression which should return a note less than 10 (10 is the highest
+# note). You have access to the variables errors warning, statement which
+# respectively contain the number of errors / warnings messages and the total
+# number of statements analyzed. This is used by the global evaluation report
+# (RP0004).
+evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10)
+
+# Template used to display messages. This is a python new-style format string
+# used to format the message information. See doc for all details
+#msg-template=
+
+# Set the output format. Available formats are text, parseable, colorized, json
+# and msvs (visual studio).You can also give a reporter class, eg
+# mypackage.mymodule.MyReporterClass.
+output-format=text
+
+# Tells whether to display a full report or only the messages
+reports=no
+
+# Activate the evaluation score.
+score=yes
+
+
+[REFACTORING]
+
+# Maximum number of nested blocks for function / method body
+max-nested-blocks=5
+
+
+[LOGGING]
+
+# Logging modules to check that the string format arguments are in logging
+# function parameter format
+logging-modules=logging
+
+
+[SPELLING]
+
+# Spelling dictionary name. Available dictionaries: none. To make it working
+# install python-enchant package.
+spelling-dict=
+
+# List of comma separated words that should not be checked.
+spelling-ignore-words=
+
+# A path to a file that contains private dictionary; one word per line.
+spelling-private-dict-file=
+
+# Tells whether to store unknown words to indicated private dictionary in
+# --spelling-private-dict-file option instead of raising a message.
+spelling-store-unknown-words=no
+
+
+[MISCELLANEOUS]
+
+# List of note tags to take in consideration, separated by a comma.
+#notes=FIXME,XXX,TODO
+notes=FIXME,XXX
+
+
+[TYPECHECK]
+
+# List of decorators that produce context managers, such as
+# contextlib.contextmanager. Add to this list to register other decorators that
+# produce valid context managers.
+contextmanager-decorators=contextlib.contextmanager
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=
+
+# Tells whether missing members accessed in mixin class should be ignored. A
+# mixin class is detected if its name ends with "mixin" (case insensitive).
+ignore-mixin-members=yes
+
+# This flag controls whether pylint should warn about no-member and similar
+# checks whenever an opaque object is returned when inferring. The inference
+# can return multiple potential results while evaluating a Python object, but
+# some branches might not be evaluated, which results in partial inference. In
+# that case, it might be useful to still emit no-member and other checks for
+# the rest of the inferred objects.
+ignore-on-opaque-inference=yes
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local
+
+# List of module names for which member attributes should not be checked
+# (useful for modules/projects where namespaces are manipulated during runtime
+# and thus existing member attributes cannot be deduced by static analysis. It
+# supports qualified module names, as well as Unix pattern matching.
+ignored-modules=
+
+# Show a hint with possible names when a member name was not found. The aspect
+# of finding the hint is based on edit distance.
+missing-member-hint=yes
+
+# The minimum edit distance a name should have in order to be considered a
+# similar match for a missing member name.
+missing-member-hint-distance=1
+
+# The total number of similar names that should be taken in consideration when
+# showing a hint for a missing member.
+missing-member-max-choices=1
+
+
+[VARIABLES]
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=
+
+# Tells whether unused global variables should be treated as a violation.
+allow-global-unused-variables=yes
+
+# List of strings which can identify a callback function by name. A callback
+# name must start or end with one of those strings.
+callbacks=cb_,_cb
+
+# A regular expression matching the name of dummy variables (i.e. expectedly
+# not used).
+dummy-variables-rgx=_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_
+
+# Argument names that match this expression will be ignored. Default to name
+# with leading underscore
+ignored-argument-names=_.*|^ignored_|^unused_
+
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# List of qualified module names which can have objects that can redefine
+# builtins.
+redefining-builtins-modules=six.moves,future.builtins
+
+
+[FORMAT]
+
+# Expected format of line ending, e.g. empty (any line ending), LF or CRLF.
+# expected-line-ending-format=
+expected-line-ending-format=LF
+
+# Regexp for a line that is allowed to be longer than the limit.
+ignore-long-lines=^\s*(# )?<?https?://\S+>?$
+
+# Number of spaces of indent required inside a hanging  or continued line.
+indent-after-paren=4
+
+# String used as indentation unit. This is usually "    " (4 spaces) or "\t" (1
+# tab).
+indent-string='    '
+
+# Maximum number of characters on a single line.
+max-line-length=100
+
+# Maximum number of lines in a module
+max-module-lines=1000
+
+# List of optional constructs for which whitespace checking is disabled. `dict-
+# separator` is used to allow tabulation in dicts, etc.: {1  : 1,\n222: 2}.
+# `trailing-comma` allows a space between comma and closing bracket: (a, ).
+# `empty-line` allows space-only lines.
+no-space-check=trailing-comma,dict-separator
+
+# Allow the body of a class to be on the same line as the declaration if body
+# contains single statement.
+single-line-class-stmt=no
+
+# Allow the body of an if to be on the same line as the test if there is no
+# else.
+single-line-if-stmt=no
+
+
+[SIMILARITIES]
+
+# Ignore comments when computing similarities.
+ignore-comments=yes
+
+# Ignore docstrings when computing similarities.
+ignore-docstrings=yes
+
+# Ignore imports when computing similarities.
+ignore-imports=no
+
+# Minimum lines number of a similarity.
+min-similarity-lines=4
+
+
+[BASIC]
+
+# Naming hint for argument names
+argument-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct argument names
+argument-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Naming hint for attribute names
+attr-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct attribute names
+attr-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Bad variable names which should always be refused, separated by a comma
+bad-names=foo,bar,baz,toto,tutu,tata
+
+# Naming hint for class attribute names
+class-attribute-name-hint=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Regular expression matching correct class attribute names
+class-attribute-rgx=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Naming hint for class names
+# class-name-hint=[A-Z_][a-zA-Z0-9]+$
+class-name-hint=[A-Z_][a-zA-Z0-9_]+$
+
+# Regular expression matching correct class names
+# class-rgx=[A-Z_][a-zA-Z0-9]+$
+class-rgx=[A-Z_][a-zA-Z0-9_]+$
+
+# Naming hint for constant names
+const-name-hint=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Regular expression matching correct constant names
+const-rgx=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Minimum line length for functions/classes that require docstrings, shorter
+# ones are exempt.
+docstring-min-length=-1
+
+# Naming hint for function names
+function-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct function names
+function-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Good variable names which should always be accepted, separated by a comma
+# good-names=i,j,k,ex,Run,_
+good-names=r,g,b,i,j,k,n,ex,Run,_
+
+# Include a hint for the correct naming format with invalid-name
+include-naming-hint=no
+
+# Naming hint for inline iteration names
+inlinevar-name-hint=[A-Za-z_][A-Za-z0-9_]*$
+
+# Regular expression matching correct inline iteration names
+inlinevar-rgx=[A-Za-z_][A-Za-z0-9_]*$
+
+# Naming hint for method names
+method-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct method names
+method-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Naming hint for module names
+module-name-hint=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Regular expression matching correct module names
+module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Colon-delimited sets of names that determine each other's naming style when
+# the name regexes allow several styles.
+name-group=
+
+# Regular expression which should only match function or class names that do
+# not require a docstring.
+no-docstring-rgx=^_
+
+# List of decorators that produce properties, such as abc.abstractproperty. Add
+# to this list to register other decorators that produce valid properties.
+property-classes=abc.abstractproperty
+
+# Naming hint for variable names
+variable-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+# Regular expression matching correct variable names
+variable-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
+
+
+[IMPORTS]
+
+# Allow wildcard imports from modules that define __all__.
+allow-wildcard-with-all=no
+
+# Analyse import fallback blocks. This can be used to support both Python 2 and
+# 3 compatible code, which means that the block might have code that exists
+# only in one or another interpreter, leading to false positives when analysed.
+analyse-fallback-blocks=no
+
+# Deprecated modules which should not be used, separated by a comma
+deprecated-modules=optparse,tkinter.tix
+
+# Create a graph of external dependencies in the given file (report RP0402 must
+# not be disabled)
+ext-import-graph=
+
+# Create a graph of every (i.e. internal and external) dependencies in the
+# given file (report RP0402 must not be disabled)
+import-graph=
+
+# Create a graph of internal dependencies in the given file (report RP0402 must
+# not be disabled)
+int-import-graph=
+
+# Force import order to recognize a module as part of the standard
+# compatibility libraries.
+known-standard-library=
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=enchant
+
+
+[CLASSES]
+
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,__new__,setUp
+
+# List of member names, which should be excluded from the protected access
+# warning.
+exclude-protected=_asdict,_fields,_replace,_source,_make
+
+# List of valid names for the first argument in a class method.
+valid-classmethod-first-arg=cls
+
+# List of valid names for the first argument in a metaclass class method.
+valid-metaclass-classmethod-first-arg=mcs
+
+
+[DESIGN]
+
+# Maximum number of arguments for function / method
+max-args=5
+
+# Maximum number of attributes for a class (see R0902).
+# max-attributes=7
+max-attributes=11
+
+# Maximum number of boolean expressions in a if statement
+max-bool-expr=5
+
+# Maximum number of branch for function / method body
+max-branches=12
+
+# Maximum number of locals for function / method body
+max-locals=15
+
+# Maximum number of parents for a class (see R0901).
+max-parents=7
+
+# Maximum number of public methods for a class (see R0904).
+max-public-methods=20
+
+# Maximum number of return / yield for function / method body
+max-returns=6
+
+# Maximum number of statements in function / method body
+max-statements=50
+
+# Minimum number of public methods for a class (see R0903).
+min-public-methods=2
+
+
+[EXCEPTIONS]
+
+# Exceptions that will emit a warning when being caught. Defaults to
+# "Exception"
+overgeneral-exceptions=Exception

.travis.yml

@@ -1,53 +1,30 @@
-# Travis CI configuration for automated .mpy file generation.
-# Author: Tony DiCola
-# License: Public Domain
-# This configuration will work with Travis CI (travis-ci.org) to automacially
-# build .mpy files for CircuitPython when a new tagged release is created.  This
-# file is relatively generic and can be shared across multiple repositories by
-# following these steps:
-#   1. Copy this file into a .travis.yml file in the root of the repository.
-#   2. Change the deploy > file section below to list each of the .mpy files
-#      that should be generated.  The config will automatically look for
-#      .py files with the same name as the source for generating the .mpy files.
-#      Note that the .mpy extension should be lower case!
-#   3. Commit the .travis.yml file and push it to GitHub.
-#   4. Go to travis-ci.org and find the repository (it needs to be setup to access
-#      your github account, and your github account needs access to write to the
-#      repo).  Flip the 'ON' switch on for Travis and the repo, see the Travis
-#      docs for more details: https://docs.travis-ci.com/user/getting-started/
-#   5. Get a GitHub 'personal access token' which has at least 'public_repo' or
-#      'repo' scope: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
-#      Keep this token safe and secure!  Anyone with the token will be able to
-#      access and write to your GitHub repositories.  Travis will use the token
-#      to attach the .mpy files to the release.
-#   6. In the Travis CI settings for the repository that was enabled find the
-#      environment variable editing page: https://docs.travis-ci.com/user/environment-variables/#Defining-Variables-in-Repository-Settings
-#      Add an environment variable named GITHUB_TOKEN and set it to the value
-#      of the GitHub personal access token above.  Keep 'Display value in build
-#      log' flipped off.
-#   7. That's it!  Tag a release and Travis should go to work to add .mpy files
-#      to the release.  It takes about a 2-3 minutes for a worker to spin up,
-#      build mpy-cross, and add the binaries to the release.
-language: generic
+# This is a common .travis.yml for generating library release zip files for
+# CircuitPython library releases using circuitpython-build-tools.
+# See https://github.com/adafruit/circuitpython-build-tools for detailed setup
+# instructions.
 
-sudo: true
+dist: trusty
+sudo: false
+language: python
+python:
+    - "3.6"
+
+cache:
+    pip: true
 
 deploy:
   provider: releases
   api_key: $GITHUB_TOKEN
-  file:
-  - "adafruit_max31865.mpy"
+  file_glob: true
+  file: bundles/*
   skip_cleanup: true
   on:
     tags: true
 
-before_install:
-- sudo apt-get -yqq update
-- sudo apt-get install -y build-essential git python python-pip
-- git clone https://github.com/adafruit/circuitpython.git -b 2.x
-- make -C circuitpython/mpy-cross
-- export PATH=$PATH:$PWD/circuitpython/mpy-cross/
-- sudo pip install shyaml
+install:
+  - pip install pylint circuitpython-build-tools
 
-before_deploy:
-- shyaml get-values deploy.file < .travis.yml | sed 's/.mpy/.py/' | xargs -L1 mpy-cross
+script:
+  - pylint adafruit_max31865.py
+  - ([[ ! -d "examples" ]] || pylint --disable=missing-docstring,invalid-name examples/*.py)
+  - circuitpython-build-bundles --filename_prefix adafruit-circuitpython-max31865 --library_location .

adafruit_max31865.py

@@ -32,7 +32,7 @@ import math
 import time
 
 import adafruit_bus_device.spi_device as spi_device
-
+from micropython import const
 
 # Register and other constant values:
 _MAX31865_CONFIG_REG = const(0x00)
@@ -63,13 +63,14 @@ _RTD_B  = -5.775e-7
 
 
 class MAX31865:
+    """Driver for the MAX31865 thermocouple amplifier."""
 
     # Class-level buffer for reading and writing data with the sensor.
     # This reduces memory allocations but means the code is not re-entrant or
     # thread safe!
     _BUFFER = bytearray(3)
 
-    def __init__(self, spi, cs, rtd_nominal=100, ref_resistor=430.0, wires=2):
+    def __init__(self, spi, cs, *, rtd_nominal=100, ref_resistor=430.0, wires=2):
         self.rtd_nominal = rtd_nominal
         self.ref_resistor = ref_resistor
         self._device = spi_device.SPIDevice(spi, cs, baudrate=500000,
@@ -77,13 +78,13 @@ class MAX31865:
         # Set wire config register based on the number of wires specified.
         if wires not in (2, 3, 4):
             raise ValueError('Wires must be a value of 2, 3, or 4!')
-        t = self._read_u8(_MAX31865_CONFIG_REG)
+        config = self._read_u8(_MAX31865_CONFIG_REG)
         if wires == 3:
-            t |= _MAX31865_CONFIG_3WIRE
+            config |= _MAX31865_CONFIG_3WIRE
         else:
             # 2 or 4 wire
-            t &= ~_MAX31865_CONFIG_3WIRE
-        self._write_u8(_MAX31865_CONFIG_REG, t)
+            config &= ~_MAX31865_CONFIG_3WIRE
+        self._write_u8(_MAX31865_CONFIG_REG, config)
         # Default to no bias and no auto conversion.
         self.bias = False
         self.auto_convert = False
@@ -113,39 +114,36 @@ class MAX31865:
 
     @property
     def bias(self):
-        """Get and set the boolean state of the sensor's bias (True/False)."""
+        """True when the sensor's bias voltage is on"""
         return bool(self._read_u8(_MAX31865_CONFIG_REG) & _MAX31865_CONFIG_BIAS)
 
     @bias.setter
     def bias(self, val):
-        t = self._read_u8(_MAX31865_CONFIG_REG)
+        config = self._read_u8(_MAX31865_CONFIG_REG)
         if val:
-            t |= _MAX31865_CONFIG_BIAS  # Enable bias.
+            config |= _MAX31865_CONFIG_BIAS  # Enable bias.
         else:
-            t &= ~_MAX31865_CONFIG_BIAS  # Disable bias.
-        self._write_u8(_MAX31865_CONFIG_REG, t)
+            config &= ~_MAX31865_CONFIG_BIAS  # Disable bias.
+        self._write_u8(_MAX31865_CONFIG_REG, config)
 
     @property
     def auto_convert(self):
-        """Get and set the boolean state of the sensor's automatic conversion
-        mode (True/False).
-        """
+        """True when the sensor automatically does conversions."""
         return bool(self._read_u8(_MAX31865_CONFIG_REG) & _MAX31865_CONFIG_MODEAUTO)
 
     @auto_convert.setter
     def auto_convert(self, val):
-        t = self._read_u8(_MAX31865_CONFIG_REG)
+        config = self._read_u8(_MAX31865_CONFIG_REG)
         if val:
-            t |= _MAX31865_CONFIG_MODEAUTO   # Enable auto convert.
+            config |= _MAX31865_CONFIG_MODEAUTO   # Enable auto convert.
         else:
-            t &= ~_MAX31865_CONFIG_MODEAUTO  # Disable auto convert.
-        self._write_u8(_MAX31865_CONFIG_REG, t)
+            config &= ~_MAX31865_CONFIG_MODEAUTO  # Disable auto convert.
+        self._write_u8(_MAX31865_CONFIG_REG, config)
 
     @property
     def fault(self):
-        """Get the fault state of the sensor.  Use the clear_faults function
-        to clear the fault state.  Returns a 6-tuple of boolean values which
-        indicate if any faults are present:
+        """The fault state of the sensor.  Use `clear_faults` to clear the fault state.  Returns a
+           6-tuple of boolean values which indicate if any faults are present:
             - HIGHTHRESH
             - LOWTHRESH
             - REFINLOW
@@ -164,23 +162,23 @@ class MAX31865:
 
     def clear_faults(self):
         """Clear any fault state previously detected by the sensor."""
-        t = self._read_u8(_MAX31865_CONFIG_REG)
-        t &= ~0x2C
-        t |= _MAX31865_CONFIG_FAULTSTAT
-        self._write_u8(_MAX31865_CONFIG_REG, t)
+        config = self._read_u8(_MAX31865_CONFIG_REG)
+        config &= ~0x2C
+        config |= _MAX31865_CONFIG_FAULTSTAT
+        self._write_u8(_MAX31865_CONFIG_REG, config)
 
     def read_rtd(self):
         """Perform a raw reading of the thermocouple and return its 15-bit
         value.  You'll need to manually convert this to temperature using the
-        nominal value of the RTD and some math.  If you just want temperature
-        use the temperature property instead.
+        nominal value of the resistance-to-digital conversion and some math.  If you just want
+        temperature use the temperature property instead.
         """
         self.clear_faults()
         self.bias = True
         time.sleep(0.01)
-        t = self._read_u8(_MAX31865_CONFIG_REG)
-        t |= _MAX31865_CONFIG_1SHOT
-        self._write_u8(_MAX31865_CONFIG_REG, t)
+        config = self._read_u8(_MAX31865_CONFIG_REG)
+        config |= _MAX31865_CONFIG_1SHOT
+        self._write_u8(_MAX31865_CONFIG_REG, config)
         time.sleep(0.065)
         rtd = self._read_u16(_MAX31865_RTDMSB_REG)
         # Remove fault bit.
@@ -189,29 +187,32 @@ class MAX31865:
 
     @property
     def temperature(self):
-        """Read the temperature of the sensor and return its value in degrees
-        Celsius.
-        """
-        Rt = self.read_rtd()
-        Rt /= 32768
-        Rt *= self.ref_resistor
+        """The temperature of the sensor in degrees Celsius."""
+        raw_reading = self.read_rtd()
+        raw_reading /= 32768
+        raw_reading *= self.ref_resistor
+
+        # This math originates from:
+        # http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
+        # To match the naming from the app note we tell lint to ignore the Z1-4 naming.
+        # pylint: disable=invalid-name
         Z1 = -_RTD_A
         Z2 = _RTD_A * _RTD_A - (4 * _RTD_B)
         Z3 = (4 * _RTD_B) / self.rtd_nominal
         Z4 = 2 * _RTD_B
-        temp = Z2 + (Z3 * Rt)
+        temp = Z2 + (Z3 * raw_reading)
         temp = (math.sqrt(temp) + Z1) / Z4
         if temp >= 0:
             return temp
-        rpoly = Rt
+        rpoly = raw_reading
         temp = -242.02
         temp += 2.2228 * rpoly
-        rpoly *= Rt  # square
+        rpoly *= raw_reading  # square
         temp += 2.5859e-3 * rpoly
-        rpoly *= Rt # ^3
+        rpoly *= raw_reading # ^3
         temp -= 4.8260e-6 * rpoly
-        rpoly *= Rt # ^4
+        rpoly *= raw_reading # ^4
         temp -= 2.8183e-8 * rpoly
-        rpoly *= Rt # ^5
+        rpoly *= raw_reading # ^5
         temp += 1.5243e-10 * rpoly
         return temp

examples/simpletest.py

@@ -1,9 +1,10 @@
 # Simple demo of the MAX31865 thermocouple amplifier.
 # Will print the temperature every second.
+import time
+
 import board
 import busio
 import digitalio
-import time
 
 import adafruit_max31865
 

readthedocs.yml

@@ -1,2 +1,3 @@
+python:
+    version: 3
 requirements_file: requirements.txt
-