Allow generic thermostat tolerance to be customisable to determine the temperature difference required to turn switch on. (#4585)

homeassistant/components/climate/generic_thermostat.py

@@ -21,10 +21,10 @@ _LOGGER = logging.getLogger(__name__)
 
 DEPENDENCIES = ['switch', 'sensor']
 
-TOL_TEMP = 0.3
+DEFAULT_TOLERANCE = 0.3
+DEFAULT_NAME = 'Generic Thermostat'
 
 CONF_NAME = 'name'
-DEFAULT_NAME = 'Generic Thermostat'
 CONF_HEATER = 'heater'
 CONF_SENSOR = 'target_sensor'
 CONF_MIN_TEMP = 'min_temp'
@@ -32,6 +32,7 @@ CONF_MAX_TEMP = 'max_temp'
 CONF_TARGET_TEMP = 'target_temp'
 CONF_AC_MODE = 'ac_mode'
 CONF_MIN_DUR = 'min_cycle_duration'
+CONF_TOLERANCE = 'tolerance'
 
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
@@ -42,6 +43,7 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Optional(CONF_MIN_DUR): vol.All(cv.time_period, cv.positive_timedelta),
     vol.Optional(CONF_MIN_TEMP): vol.Coerce(float),
     vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+    vol.Optional(CONF_TOLERANCE, default=DEFAULT_TOLERANCE): vol.Coerce(float),
     vol.Optional(CONF_TARGET_TEMP): vol.Coerce(float),
 })
 
@@ -56,23 +58,26 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
     target_temp = config.get(CONF_TARGET_TEMP)
     ac_mode = config.get(CONF_AC_MODE)
     min_cycle_duration = config.get(CONF_MIN_DUR)
+    tolerance = config.get(CONF_TOLERANCE)
 
     add_devices([GenericThermostat(
         hass, name, heater_entity_id, sensor_entity_id, min_temp, max_temp,
-        target_temp, ac_mode, min_cycle_duration)])
+        target_temp, ac_mode, min_cycle_duration, tolerance)])
 
 
 class GenericThermostat(ClimateDevice):
     """Representation of a GenericThermostat device."""
 
     def __init__(self, hass, name, heater_entity_id, sensor_entity_id,
-                 min_temp, max_temp, target_temp, ac_mode, min_cycle_duration):
+                 min_temp, max_temp, target_temp, ac_mode, min_cycle_duration,
+                 tolerance):
         """Initialize the thermostat."""
         self.hass = hass
         self._name = name
         self.heater_entity_id = heater_entity_id
         self.ac_mode = ac_mode
         self.min_cycle_duration = min_cycle_duration
+        self._tolerance = tolerance
 
         self._active = False
         self._cur_temp = None
@@ -193,7 +198,7 @@ class GenericThermostat(ClimateDevice):
                 return
 
         if self.ac_mode:
-            too_hot = self._cur_temp - self._target_temp > TOL_TEMP
+            too_hot = self._cur_temp - self._target_temp > self._tolerance
             is_cooling = self._is_device_active
             if too_hot and not is_cooling:
                 _LOGGER.info('Turning on AC %s', self.heater_entity_id)
@@ -202,7 +207,7 @@ class GenericThermostat(ClimateDevice):
                 _LOGGER.info('Turning off AC %s', self.heater_entity_id)
                 switch.turn_off(self.hass, self.heater_entity_id)
         else:
-            too_cold = self._target_temp - self._cur_temp > TOL_TEMP
+            too_cold = self._target_temp - self._cur_temp > self._tolerance
             is_heating = self._is_device_active
 
             if too_cold and not is_heating:

tests/components/climate/test_generic_thermostat.py

@@ -25,6 +25,7 @@ ENT_SWITCH = 'switch.test'
 MIN_TEMP = 3.0
 MAX_TEMP = 65.0
 TARGET_TEMP = 42.0
+TOLERANCE = 0.5
 
 
 class TestSetupClimateGenericThermostat(unittest.TestCase):
@@ -84,6 +85,7 @@ class TestClimateGenericThermostat(unittest.TestCase):
         assert setup_component(self.hass, climate.DOMAIN, {'climate': {
             'platform': 'generic_thermostat',
             'name': 'test',
+            'tolerance': 2,
             'heater': ENT_SWITCH,
             'target_sensor': ENT_SENSOR
         }})
@@ -113,7 +115,7 @@ class TestClimateGenericThermostat(unittest.TestCase):
             'target_sensor': ENT_SENSOR,
             'min_temp': MIN_TEMP,
             'max_temp': MAX_TEMP,
-            'target_temp': TARGET_TEMP
+            'target_temp': TARGET_TEMP,
         }})
         state = self.hass.states.get(ENTITY)
         self.assertEqual(MIN_TEMP, state.attributes.get('min_temp'))
@@ -205,6 +207,30 @@ class TestClimateGenericThermostat(unittest.TestCase):
         self.assertEqual(SERVICE_TURN_OFF, call.service)
         self.assertEqual(ENT_SWITCH, call.data['entity_id'])
 
+    def test_temp_change_heater_on_within_tolerance(self):
+        """Test if temperature change turn heater on within tolerance."""
+        self._setup_switch(False)
+        climate.set_temperature(self.hass, 30)
+        self.hass.block_till_done()
+        self._setup_sensor(29)
+        self.hass.block_till_done()
+        self.assertEqual(0, len(self.calls))
+
+    def test_temp_change_heater_on_outside_tolerance(self):
+        """Test if temperature change doesn't turn heater on outside
+        tolerance.
+        """
+        self._setup_switch(False)
+        climate.set_temperature(self.hass, 30)
+        self.hass.block_till_done()
+        self._setup_sensor(25)
+        self.hass.block_till_done()
+        self.assertEqual(1, len(self.calls))
+        call = self.calls[0]
+        self.assertEqual('switch', call.domain)
+        self.assertEqual(SERVICE_TURN_ON, call.service)
+        self.assertEqual(ENT_SWITCH, call.data['entity_id'])
+
     def _setup_sensor(self, temp, unit=TEMP_CELSIUS):
         """Setup the test sensor."""
         self.hass.states.set(ENT_SENSOR, temp, {
@@ -235,6 +261,7 @@ class TestClimateGenericThermostatACMode(unittest.TestCase):
         assert setup_component(self.hass, climate.DOMAIN, {'climate': {
             'platform': 'generic_thermostat',
             'name': 'test',
+            'tolerance': 0.3,
             'heater': ENT_SWITCH,
             'target_sensor': ENT_SENSOR,
             'ac_mode': True
@@ -326,6 +353,7 @@ class TestClimateGenericThermostatACModeMinCycle(unittest.TestCase):
         assert setup_component(self.hass, climate.DOMAIN, {'climate': {
             'platform': 'generic_thermostat',
             'name': 'test',
+            'tolerance': 0.3,
             'heater': ENT_SWITCH,
             'target_sensor': ENT_SENSOR,
             'ac_mode': True,
@@ -418,6 +446,7 @@ class TestClimateGenericThermostatMinCycle(unittest.TestCase):
         assert setup_component(self.hass, climate.DOMAIN, {'climate': {
             'platform': 'generic_thermostat',
             'name': 'test',
+            'tolerance': 0.3,
             'heater': ENT_SWITCH,
             'target_sensor': ENT_SENSOR,
             'min_cycle_duration': datetime.timedelta(minutes=10)