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__pycache__
_build
*.pyc

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# 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
sudo: true
deploy:
provider: releases
api_key: $GITHUB_TOKEN
file:
- "adafruit_max31865.mpy"
skip_cleanup: true
on:
tags: true
before_install:
- sudo apt-get -yqq update
- sudo apt-get install -y build-essential git python python-pip
- git clone https://github.com/adafruit/circuitpython.git -b 2.x
- make -C circuitpython/mpy-cross
- export PATH=$PATH:$PWD/circuitpython/mpy-cross/
- sudo pip install shyaml
before_deploy:
- shyaml get-values deploy.file < .travis.yml | sed 's/.mpy/.py/' | xargs -L1 mpy-cross

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# Contributor Covenant Code of Conduct
## Our Pledge
In the interest of fostering an open and welcoming environment, we as
contributors and maintainers pledge to making participation in our project and
our community a harassment-free experience for everyone, regardless of age, body
size, disability, ethnicity, gender identity and expression, level of experience,
nationality, personal appearance, race, religion, or sexual identity and
orientation.
## Our Standards
Examples of behavior that contributes to creating a positive environment
include:
* Using welcoming and inclusive language
* Being respectful of differing viewpoints and experiences
* Gracefully accepting constructive criticism
* Focusing on what is best for the community
* Showing empathy towards other community members
Examples of unacceptable behavior by participants include:
* The use of sexualized language or imagery and unwelcome sexual attention or
advances
* Trolling, insulting/derogatory comments, and personal or political attacks
* Public or private harassment
* Publishing others' private information, such as a physical or electronic
address, without explicit permission
* Other conduct which could reasonably be considered inappropriate in a
professional setting
## Our Responsibilities
Project maintainers are responsible for clarifying the standards of acceptable
behavior and are expected to take appropriate and fair corrective action in
response to any instances of unacceptable behavior.
Project maintainers have the right and responsibility to remove, edit, or
reject comments, commits, code, wiki edits, issues, and other contributions
that are not aligned to this Code of Conduct, or to ban temporarily or
permanently any contributor for other behaviors that they deem inappropriate,
threatening, offensive, or harmful.
## Scope
This Code of Conduct applies both within project spaces and in public spaces
when an individual is representing the project or its community. Examples of
representing a project or community include using an official project e-mail
address, posting via an official social media account, or acting as an appointed
representative at an online or offline event. Representation of a project may be
further defined and clarified by project maintainers.
## Enforcement
Instances of abusive, harassing, or otherwise unacceptable behavior may be
reported by contacting the project team at support@adafruit.com. All
complaints will be reviewed and investigated and will result in a response that
is deemed necessary and appropriate to the circumstances. The project team is
obligated to maintain confidentiality with regard to the reporter of an incident.
Further details of specific enforcement policies may be posted separately.
Project maintainers who do not follow or enforce the Code of Conduct in good
faith may face temporary or permanent repercussions as determined by other
members of the project's leadership.
## Attribution
This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
available at [http://contributor-covenant.org/version/1/4][version]
[homepage]: http://contributor-covenant.org
[version]: http://contributor-covenant.org/version/1/4/

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The MIT License (MIT)
Copyright (c) 2017 Tony DiCola for Adafruit Industries
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Introduction
============
.. image:: https://readthedocs.org/projects/adafruit-circuitpython-max31865/badge/?version=latest
:target: https://circuitpython.readthedocs.io/projects/max31865/en/latest/
:alt: Documentation Status
.. image :: https://img.shields.io/discord/327254708534116352.svg
:target: https://discord.gg/nBQh6qu
:alt: Discord
TODO
Dependencies
=============
This driver depends on:
* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
* `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
Please ensure all dependencies are available on the CircuitPython filesystem.
This is easily achieved by downloading
`the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
Usage Example
=============
TODO
Contributing
============
Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_max31865/blob/master/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
API Reference
=============
.. toctree::
:maxdepth: 2
api

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# The MIT License (MIT)
#
# Copyright (c) 2017 Tony DiCola for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
`adafruit_max31865`
====================================================
CircuitPython module for the MAX31865 platinum RTD temperature sensor. See
examples/simpletest.py for an example of the usage.
* Author(s): Tony DiCola
"""
import math
import time
import adafruit_bus_device.spi_device as spi_device
# Register and other constant values:
_MAX31865_CONFIG_REG = const(0x00)
_MAX31865_CONFIG_BIAS = const(0x80)
_MAX31865_CONFIG_MODEAUTO = const(0x40)
_MAX31865_CONFIG_MODEOFF = const(0x00)
_MAX31865_CONFIG_1SHOT = const(0x20)
_MAX31865_CONFIG_3WIRE = const(0x10)
_MAX31865_CONFIG_24WIRE = const(0x00)
_MAX31865_CONFIG_FAULTSTAT = const(0x02)
_MAX31865_CONFIG_FILT50HZ = const(0x01)
_MAX31865_CONFIG_FILT60HZ = const(0x00)
_MAX31865_RTDMSB_REG = const(0x01)
_MAX31865_RTDLSB_REG = const(0x02)
_MAX31865_HFAULTMSB_REG = const(0x03)
_MAX31865_HFAULTLSB_REG = const(0x04)
_MAX31865_LFAULTMSB_REG = const(0x05)
_MAX31865_LFAULTLSB_REG = const(0x06)
_MAX31865_FAULTSTAT_REG = const(0x07)
_MAX31865_FAULT_HIGHTHRESH = const(0x80)
_MAX31865_FAULT_LOWTHRESH = const(0x40)
_MAX31865_FAULT_REFINLOW = const(0x20)
_MAX31865_FAULT_REFINHIGH = const(0x10)
_MAX31865_FAULT_RTDINLOW = const(0x08)
_MAX31865_FAULT_OVUV = const(0x04)
_RTD_A = 3.9083e-3
_RTD_B = -5.775e-7
class MAX31865:
# 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):
self.rtd_nominal = rtd_nominal
self.red_resistor = ref_resistor
self._device = spi_device.SPIDevice(spi, cs)
# Set wire config register based on the number of wires specified.
if wires not in _WIRE_MAP:
raise ValueError('Wires must be a value of 2, 3, or 4!')
t = self._read_u8(_MAX31865_CONFIG_REG)
if wires == 3:
t |= _MAX31865_CONFIG_3WIRE
else:
# 2 or 4 wire
t &= ~_MAX31865_CONFIG_3WIRE
self._write_u8(_MAX31865_CONFIG_REG, t)
# Default to no bias and no auto conversion.
self.bias = False
self.auto_convert = False
def _read_u8(self, address):
# Read an 8-bit unsigned value from the specified 8-bit address.
with self._device as device:
device.configure(baudrate=500000, phase=1, polarity=0)
_BUFFER[0] = address & 0x7F
device.write(self._BUFFER, end=1)
device.readinto(self._BUFFER, end=1)
return self._BUFFER[0]
def _read_u16(self, address):
# Read a 16-bit BE unsigned value from the specified 8-bit address.
with self._device as device:
device.configure(baudrate=500000, phase=1, polarity=0)
self._BUFFER[0] = address & 0x7F
device.write(self._BUFFER, end=1)
device.readinto(self._BUFFER, end=2)
return (self._BUFFER[0] << 8) | self._BUFFER[1]
def _write_u8(self, address, val):
# Write an 8-bit unsigned value to the specified 8-bit address.
with self._device as device:
device.configure(baudrate=500000, phase=1, polarity=0)
self._BUFFER[0] = (address & 0xFF) | 0x80
self._BUFFER[1] = val & 0xFF
self._device.write(self._BUFFER, end=2)
@property
def bias(self):
"""Get and set the boolean state of the sensor's bias (True/False)."""
return bool(self._read_u8(_MAX31865_CONFIG_REG) & _MAX31865_CONFIG_BIAS)
@bias.setter
def bias(self, val):
t = self._read_u8(_MAX31865_CONFIG_REG)
if val:
t |= _MAX31865_CONFIG_BIAS # Enable bias.
else:
t &= ~MAX31865_CONFIG_BIAS # Disable bias.
self._write_u8(_MAX31865_CONFIG_REG, t)
@property
def auto_convert(self):
"""Get and set the boolean state of the sensor's automatic conversion
mode (True/False).
"""
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)
if val:
t |= _MAX31865_CONFIG_MODEAUTO # Enable auto convert.
else:
t &= ~_MAX31865_CONFIG_MODEAUTO # Disable auto convert.
self._write_u8(_MAX31865_CONFIG_REG, t)
@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:
- HIGHTHRESH
- LOWTHRESH
- REFINLOW
- REFINHIGH
- RTDINLOW
- OVUV
"""
faults = self._read_u8(_MAX31865_FAULTSTAT_REG)
highthresh = bool(faults & _MAX31865_FAULT_HIGHTHRESH)
lowthresh = bool(faults & _MAX31865_FAULT_LOWTHRESH)
refinlow = bool(faults & _MAX31865_FAULT_REFINLOW)
refinhigh = bool(faults & _MAX31865_FAULT_REFINHIGH)
rtdinlow = bool(faults & _MAX31865_FAULT_RTDINLOW)
ovuv = bool(faults & _MAX31865_FAULT_OVUV)
return (highthresh, lowthresh, refinlow, refinhigh, rtdinlow, ovuv)
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)
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.
"""
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)
time.sleep(0.065)
rtd = self._read_u16(_MAX31865_RTDMSB_REG)
# Remove fault bit.
rtd >>= 1
return rtd
@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
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 = (math.sqrt(temp) + Z1) / Z4
if temp >= 0:
return temp
rpoly = Rt
temp = -242.02
temp += 2.2228 * rpoly
rpoly *= Rt # square
temp += 2.5859e-3 * rpoly
rpoly *= Rt # ^3
temp -= 4.8260e-6 * rpoly
rpoly *= Rt # ^4
temp -= 2.8183e-8 * rpoly
rpoly *= Rt # ^5
temp += 1.5243e-10 * rpoly
return temp

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.. If you created a package, create one automodule per module in the package.
.. automodule:: adafruit_max31865
:members:

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# -*- coding: utf-8 -*-
import os
import sys
sys.path.insert(0, os.path.abspath('.'))
# -- General configuration ------------------------------------------------
# Add any Sphinx extension module names here, as strings. They can be
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = [
'sphinx.ext.autodoc',
'sphinx.ext.intersphinx',
'sphinx.ext.viewcode',
]
intersphinx_mapping = {'python': ('https://docs.python.org/3.4', None),'BusDevice': ('https://circuitpython.readthedocs.io/projects/bus_device/en/latest/', None),'CircuitPython': ('https://circuitpython.readthedocs.io/en/latest/', None)}
# Add any paths that contain templates here, relative to this directory.
templates_path = ['_templates']
source_suffix = '.rst'
# The master toctree document.
master_doc = 'README'
# General information about the project.
project = u'Adafruit MAX31865 Library'
copyright = u'2017 Tony DiCola'
author = u'Tony DiCola'
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
# built documents.
#
# The short X.Y version.
version = u'1.0'
# The full version, including alpha/beta/rc tags.
release = u'1.0'
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
#
# This is also used if you do content translation via gettext catalogs.
# Usually you set "language" from the command line for these cases.
language = None
# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
# This patterns also effect to html_static_path and html_extra_path
exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
# The reST default role (used for this markup: `text`) to use for all
# documents.
#
default_role = "any"
# If true, '()' will be appended to :func: etc. cross-reference text.
#
add_function_parentheses = True
# The name of the Pygments (syntax highlighting) style to use.
pygments_style = 'sphinx'
# If true, `todo` and `todoList` produce output, else they produce nothing.
todo_include_todos = False
# -- Options for HTML output ----------------------------------------------
# The theme to use for HTML and HTML Help pages. See the documentation for
# a list of builtin themes.
#
on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
if not on_rtd: # only import and set the theme if we're building docs locally
try:
import sphinx_rtd_theme
html_theme = 'sphinx_rtd_theme'
html_theme_path = [sphinx_rtd_theme.get_html_theme_path(), '.']
except:
html_theme = 'default'
html_theme_path = ['.']
else:
html_theme_path = ['.']
# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
html_static_path = ['_static']
# Output file base name for HTML help builder.
htmlhelp_basename = 'AdafruitMAX31865Librarydoc'
# -- Options for LaTeX output ---------------------------------------------
latex_elements = {
# The paper size ('letterpaper' or 'a4paper').
#
# 'papersize': 'letterpaper',
# The font size ('10pt', '11pt' or '12pt').
#
# 'pointsize': '10pt',
# Additional stuff for the LaTeX preamble.
#
# 'preamble': '',
# Latex figure (float) alignment
#
# 'figure_align': 'htbp',
}
# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
# author, documentclass [howto, manual, or own class]).
latex_documents = [
(master_doc, 'AdafruitMAX31865Library.tex', u'Adafruit MAX31865 Library Documentation',
author, 'manual'),
]
# -- Options for manual page output ---------------------------------------
# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [
(master_doc, 'adafruitMAX31865library', u'Adafruit MAX31865 Library Documentation',
[author], 1)
]
# -- Options for Texinfo output -------------------------------------------
# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
# dir menu entry, description, category)
texinfo_documents = [
(master_doc, 'AdafruitMAX31865Library', u'Adafruit MAX31865 Library Documentation',
author, 'AdafruitMAX31865Library', 'One line description of project.',
'Miscellaneous'),
]

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requirements_file: requirements.txt

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adafruit-circuitpython-bus-device