Add TMP117 component (#992)

* Create TMP117 sensor component

esphome/components/tmp117/sensor.py

@@ -0,0 +1,67 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c, sensor
+from esphome.const import CONF_ID, CONF_UPDATE_INTERVAL, \
+    UNIT_CELSIUS, ICON_THERMOMETER
+
+DEPENDENCIES = ['i2c']
+
+tmp117_ns = cg.esphome_ns.namespace('tmp117')
+TMP117Component = tmp117_ns.class_('TMP117Component',
+                                   cg.PollingComponent, i2c.I2CDevice, sensor.Sensor)
+
+CONFIG_SCHEMA = cv.All(sensor.sensor_schema(UNIT_CELSIUS, ICON_THERMOMETER, 1).extend({
+    cv.GenerateID(): cv.declare_id(TMP117Component),
+}).extend(cv.polling_component_schema('60s')).extend(i2c.i2c_device_schema(0x48)))
+
+
+def determine_config_register(polling_period):
+    if polling_period >= 16.0:
+        # 64 averaged conversions, max conversion time
+        # 0000 00 111 11 00000
+        # 0000 0011 1110 0000
+        return 0x03E0
+    if polling_period >= 8.0:
+        # 64 averaged conversions, high conversion time
+        # 0000 00 110 11 00000
+        # 0000 0011 0110 0000
+        return 0x0360
+    if polling_period >= 4.0:
+        # 64 averaged conversions, mid conversion time
+        # 0000 00 101 11 00000
+        # 0000 0010 1110 0000
+        return 0x02E0
+    if polling_period >= 1.0:
+        # 64 averaged conversions, min conversion time
+        # 0000 00 000 11 00000
+        # 0000 0000 0110 0000
+        return 0x0060
+    if polling_period >= 0.5:
+        # 32 averaged conversions, min conversion time
+        # 0000 00 000 10 00000
+        # 0000 0000 0100 0000
+        return 0x0040
+    if polling_period >= 0.25:
+        # 8 averaged conversions, mid conversion time
+        # 0000 00 010 01 00000
+        # 0000 0001 0010 0000
+        return 0x0120
+    if polling_period >= 0.125:
+        # 8 averaged conversions, min conversion time
+        # 0000 00 000 01 00000
+        # 0000 0000 0010 0000
+        return 0x0020
+    # 1 averaged conversions, min conversion time
+    # 0000 00 000 00 00000
+    # 0000 0000 0000 0000
+    return 0x0000
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield i2c.register_i2c_device(var, config)
+    yield sensor.register_sensor(var, config)
+
+    update_period = config[CONF_UPDATE_INTERVAL].total_seconds
+    cg.add(var.set_config(determine_config_register(update_period)))