Merge pull request #1392 from kyleluiten/master

Add input for MAX31855 using CircuitPython library

mycodo/inputs/max31855_circuitpython.py

@@ -0,0 +1,126 @@
+# coding=utf-8
+import copy
+
+from mycodo.inputs.base_input import AbstractInput
+
+# Measurements
+measurements_dict = {
+    0: {
+        'measurement': 'temperature',
+        'unit': 'C',
+        'name': 'Object'
+    },
+    1: {
+        'measurement': 'temperature',
+        'unit': 'C',
+        'name': 'Die'
+    }
+}
+
+# Input information
+INPUT_INFORMATION = {
+    'input_name_unique': 'MAX31855_CIRCUITPYTHON',
+    'input_manufacturer': 'MAXIM',
+    'input_name': 'MAX31855',
+    'input_library': 'adafruit-circuitpython-max31855',
+    'measurements_name': 'Temperature (Object/Die)',
+    'measurements_dict': measurements_dict,
+    'url_manufacturer': 'https://www.maximintegrated.com/en/products/interface/sensor-interface/MAX31855.html',
+    'url_datasheet': 'https://datasheets.maximintegrated.com/en/ds/MAX31855.pdf',
+    'url_product_purchase': 'https://www.adafruit.com/product/269',   
+    'options_enabled': [
+        'measurements_select',
+        'period',
+        'pre_output'
+    ],
+    'options_disabled': ['interface'],
+    'dependencies_module': [
+        ('pip-pypi', 'adafruit_max31855', 'adafruit-circuitpython-max31855==3.2.21')
+    ],
+
+    'interfaces': ['SPI'],
+
+    'custom_options': [
+        {
+            'id': 'cs_pin',
+            'type': 'integer',
+            'default_value': 5,
+            'name': 'Chip Select Pin',
+            'phrase': 'Enter the GPIO Chip Select Pin for your device.'
+        }
+    ]
+}
+
+
+class InputModule(AbstractInput):
+    """A sensor support class that measures the MAX31855's temperature."""
+    def __init__(self, input_dev, testing=False):
+        super().__init__(input_dev, testing=testing, name=__name__)
+
+        self.sensor = None
+        self.spi = None
+        self.cs = None
+        self.cs_pin = None
+
+        if not testing:
+            self.setup_custom_options(
+                INPUT_INFORMATION['custom_options'], input_dev)
+            self.try_initialize()
+
+    def initialize(self):
+        import board
+        import digitalio
+        import adafruit_max31855
+
+        bcm_to_board = [
+            board.D1,
+            board.D2,
+            board.D3,
+            board.D4,
+            board.D5,
+            board.D6,
+            board.D7,
+            board.D8,
+            board.D9,
+            board.D10,
+            board.D11,
+            board.D12,
+            board.D13,
+            board.D14,
+            board.D15,
+            board.D16,
+            board.D17,
+            board.D18,
+            board.D19,
+            board.D20,
+            board.D21,
+            board.D22,
+            board.D23,
+            board.D24,
+            board.D25,
+            board.D26,
+            board.D27
+        ]
+
+        self.spi = board.SPI()
+        self.cs = digitalio.DigitalInOut(bcm_to_board[self.cs_pin - 1])
+
+        self.sensor = adafruit_max31855.MAX31855(
+            self.spi,
+            self.cs)
+
+    def get_measurement(self):
+        """Gets the measurement in units by reading the."""
+        if not self.sensor:
+            self.logger.error("Error 101: Device not set up. See https://kizniche.github.io/Mycodo/Error-Codes#error-101 for more info.")
+            return
+
+        self.return_dict = copy.deepcopy(measurements_dict)
+
+        if self.is_enabled(0):
+            self.value_set(0, self.sensor.temperature)
+
+        if self.is_enabled(1):
+            self.value_set(1, self.sensor.reference_temperature)
+
+        return self.return_dict