diff --git a/esphome/components/bang_bang/climate.py b/esphome/components/bang_bang/climate.py
index 88828ef44f..4ef811c55d 100644
--- a/esphome/components/bang_bang/climate.py
+++ b/esphome/components/bang_bang/climate.py
@@ -7,7 +7,7 @@ from esphome.const import CONF_AWAY_CONFIG, CONF_COOL_ACTION, \
     CONF_ID, CONF_IDLE_ACTION, CONF_SENSOR
 
 bang_bang_ns = cg.esphome_ns.namespace('bang_bang')
-BangBangClimate = bang_bang_ns.class_('BangBangClimate', climate.Climate)
+BangBangClimate = bang_bang_ns.class_('BangBangClimate', climate.Climate, cg.Component)
 BangBangClimateTargetTempConfig = bang_bang_ns.struct('BangBangClimateTargetTempConfig')
 
 CONFIG_SCHEMA = cv.All(climate.CLIMATE_SCHEMA.extend({
diff --git a/esphome/components/climate/climate_mode.cpp b/esphome/components/climate/climate_mode.cpp
index 32d42b706f..07b97f4f33 100644
--- a/esphome/components/climate/climate_mode.cpp
+++ b/esphome/components/climate/climate_mode.cpp
@@ -6,13 +6,13 @@ namespace climate {
 const char *climate_mode_to_string(ClimateMode mode) {
   switch (mode) {
     case CLIMATE_MODE_OFF:
-      return "off";
+      return "OFF";
     case CLIMATE_MODE_AUTO:
-      return "auto";
+      return "AUTO";
     case CLIMATE_MODE_COOL:
-      return "cool";
+      return "COOL";
     case CLIMATE_MODE_HEAT:
-      return "heat";
+      return "HEAT";
     default:
       return "UNKNOWN";
   }
diff --git a/esphome/components/deep_sleep/deep_sleep_component.cpp b/esphome/components/deep_sleep/deep_sleep_component.cpp
index ed14f3c824..217c0cbf0d 100644
--- a/esphome/components/deep_sleep/deep_sleep_component.cpp
+++ b/esphome/components/deep_sleep/deep_sleep_component.cpp
@@ -19,7 +19,8 @@ void DeepSleepComponent::setup() {
 void DeepSleepComponent::dump_config() {
   ESP_LOGCONFIG(TAG, "Setting up Deep Sleep...");
   if (this->sleep_duration_.has_value()) {
-    ESP_LOGCONFIG(TAG, "  Sleep Duration: %llu ms", *this->sleep_duration_ / 1000);
+    uint32_t duration = *this->sleep_duration_ / 1000;
+    ESP_LOGCONFIG(TAG, "  Sleep Duration: %u ms", duration);
   }
   if (this->run_duration_.has_value()) {
     ESP_LOGCONFIG(TAG, "  Run Duration: %u ms", *this->run_duration_);
diff --git a/esphome/components/ethernet/__init__.py b/esphome/components/ethernet/__init__.py
index 50a0d99d32..ce7422d05b 100644
--- a/esphome/components/ethernet/__init__.py
+++ b/esphome/components/ethernet/__init__.py
@@ -67,7 +67,7 @@ CONFIG_SCHEMA = cv.All(cv.Schema({
     cv.Optional(CONF_USE_ADDRESS): cv.string_strict,
 
     cv.Optional('hostname'): cv.invalid("The hostname option has been removed in 1.11.0"),
-}), validate)
+}).extend(cv.COMPONENT_SCHEMA), validate)
 
 
 def manual_ip(config):
@@ -84,6 +84,7 @@ def manual_ip(config):
 @coroutine_with_priority(60.0)
 def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
 
     cg.add(var.set_phy_addr(config[CONF_PHY_ADDR]))
     cg.add(var.set_mdc_pin(config[CONF_MDC_PIN]))
diff --git a/esphome/components/homeassistant/binary_sensor/__init__.py b/esphome/components/homeassistant/binary_sensor/__init__.py
index b78836f18f..88e2f2fcb2 100644
--- a/esphome/components/homeassistant/binary_sensor/__init__.py
+++ b/esphome/components/homeassistant/binary_sensor/__init__.py
@@ -6,7 +6,8 @@ from .. import homeassistant_ns
 
 DEPENDENCIES = ['api']
 HomeassistantBinarySensor = homeassistant_ns.class_('HomeassistantBinarySensor',
-                                                    binary_sensor.BinarySensor)
+                                                    binary_sensor.BinarySensor,
+                                                    cg.Component)
 
 CONFIG_SCHEMA = binary_sensor.BINARY_SENSOR_SCHEMA.extend({
     cv.GenerateID(): cv.declare_id(HomeassistantBinarySensor),
diff --git a/esphome/components/homeassistant/sensor/__init__.py b/esphome/components/homeassistant/sensor/__init__.py
index cd5e4a74e2..577efca79b 100644
--- a/esphome/components/homeassistant/sensor/__init__.py
+++ b/esphome/components/homeassistant/sensor/__init__.py
@@ -6,7 +6,8 @@ from .. import homeassistant_ns
 
 DEPENDENCIES = ['api']
 
-HomeassistantSensor = homeassistant_ns.class_('HomeassistantSensor', sensor.Sensor)
+HomeassistantSensor = homeassistant_ns.class_('HomeassistantSensor', sensor.Sensor,
+                                              cg.Component)
 
 CONFIG_SCHEMA = sensor.sensor_schema(UNIT_EMPTY, ICON_EMPTY, 1).extend({
     cv.GenerateID(): cv.declare_id(HomeassistantSensor),
diff --git a/esphome/components/ledc/output.py b/esphome/components/ledc/output.py
index e5cb073ca9..c507465ff9 100644
--- a/esphome/components/ledc/output.py
+++ b/esphome/components/ledc/output.py
@@ -71,3 +71,5 @@ def to_code(config):
     yield output.register_output(var, config)
     if CONF_CHANNEL in config:
         cg.add(var.set_channel(config[CONF_CHANNEL]))
+    cg.add(var.set_frequency(config[CONF_FREQUENCY]))
+    cg.add(var.set_bit_depth(config[CONF_BIT_DEPTH]))
diff --git a/esphome/components/mqtt/mqtt_climate.cpp b/esphome/components/mqtt/mqtt_climate.cpp
index 590a6db7b4..8085fbf0f2 100644
--- a/esphome/components/mqtt/mqtt_climate.cpp
+++ b/esphome/components/mqtt/mqtt_climate.cpp
@@ -24,12 +24,12 @@ void MQTTClimateComponent::send_discovery(JsonObject &root, mqtt::SendDiscoveryC
   JsonArray &modes = root.createNestedArray("modes");
   // sort array for nice UI in HA
   if (traits.supports_mode(CLIMATE_MODE_AUTO))
-    modes.add(climate_mode_to_string(CLIMATE_MODE_AUTO));
-  modes.add(climate_mode_to_string(CLIMATE_MODE_OFF));
+    modes.add("auto");
+  modes.add("off");
   if (traits.supports_mode(CLIMATE_MODE_COOL))
-    modes.add(climate_mode_to_string(CLIMATE_MODE_COOL));
+    modes.add("cool");
   if (traits.supports_mode(CLIMATE_MODE_HEAT))
-    modes.add(climate_mode_to_string(CLIMATE_MODE_HEAT));
+    modes.add("heat");
 
   if (traits.get_supports_two_point_target_temperature()) {
     // temperature_low_command_topic
diff --git a/esphome/components/pulse_width/sensor.py b/esphome/components/pulse_width/sensor.py
index 0227adffce..8328da2ac0 100644
--- a/esphome/components/pulse_width/sensor.py
+++ b/esphome/components/pulse_width/sensor.py
@@ -10,7 +10,7 @@ PulseWidthSensor = pulse_width_ns.class_('PulseWidthSensor', sensor.Sensor, cg.P
 
 CONFIG_SCHEMA = sensor.sensor_schema(UNIT_SECOND, ICON_TIMER, 3).extend({
     cv.GenerateID(): cv.declare_id(PulseWidthSensor),
-    cv.Required(CONF_PIN): cv.All(pins.internal_gpio_input_pullup_pin_schema,
+    cv.Required(CONF_PIN): cv.All(pins.internal_gpio_input_pin_schema,
                                   pins.validate_has_interrupt),
 }).extend(cv.polling_component_schema('60s'))
 
diff --git a/esphome/components/status/status_binary_sensor.cpp b/esphome/components/status/status_binary_sensor.cpp
index 5485c6ebcd..7fbeb8c171 100644
--- a/esphome/components/status/status_binary_sensor.cpp
+++ b/esphome/components/status/status_binary_sensor.cpp
@@ -1,6 +1,7 @@
 #include "status_binary_sensor.h"
 #include "esphome/core/log.h"
 #include "esphome/core/util.h"
+#include "esphome/core/defines.h"
 
 #ifdef USE_MQTT
 #include "esphome/components/mqtt/mqtt_client.h"
@@ -18,19 +19,16 @@ void StatusBinarySensor::loop() {
   bool status = network_is_connected();
 #ifdef USE_MQTT
   if (mqtt::global_mqtt_client != nullptr) {
-    status = mqtt::global_mqtt_client->is_connected();
+    status = status && mqtt::global_mqtt_client->is_connected();
   }
 #endif
 #ifdef USE_API
   if (api::global_api_server != nullptr) {
-    status = api::global_api_server->is_connected();
+    status = status && api::global_api_server->is_connected();
   }
 #endif
 
-  if (this->last_status_ != status) {
-    this->publish_state(status);
-    this->last_status_ = status;
-  }
+  this->publish_state(status);
 }
 void StatusBinarySensor::setup() { this->publish_state(false); }
 void StatusBinarySensor::dump_config() { LOG_BINARY_SENSOR("", "Status Binary Sensor", this); }
diff --git a/esphome/components/status/status_binary_sensor.h b/esphome/components/status/status_binary_sensor.h
index fa121291a1..08aa0fb32f 100644
--- a/esphome/components/status/status_binary_sensor.h
+++ b/esphome/components/status/status_binary_sensor.h
@@ -16,9 +16,6 @@ class StatusBinarySensor : public binary_sensor::BinarySensor, public Component
   float get_setup_priority() const override { return setup_priority::DATA; }
 
   bool is_status_binary_sensor() const override { return true; }
-
- protected:
-  bool last_status_{false};
 };
 
 }  // namespace status
diff --git a/esphome/components/switch/__init__.py b/esphome/components/switch/__init__.py
index 6425a364a1..3870631e13 100644
--- a/esphome/components/switch/__init__.py
+++ b/esphome/components/switch/__init__.py
@@ -83,13 +83,13 @@ def switch_toggle_to_code(config, action_id, template_arg, args):
 @automation.register_condition('switch.is_on', SwitchCondition, SWITCH_ACTION_SCHEMA)
 def switch_is_on_to_code(config, condition_id, template_arg, args):
     paren = yield cg.get_variable(config[CONF_ID])
-    yield cg.new_Pvariable(condition_id, template_arg, paren)
+    yield cg.new_Pvariable(condition_id, template_arg, paren, True)
 
 
 @automation.register_condition('switch.is_off', SwitchCondition, SWITCH_ACTION_SCHEMA)
 def switch_is_off_to_code(config, condition_id, template_arg, args):
     paren = yield cg.get_variable(config[CONF_ID])
-    yield cg.new_Pvariable(condition_id, template_arg, paren)
+    yield cg.new_Pvariable(condition_id, template_arg, paren, False)
 
 
 @coroutine_with_priority(100.0)
diff --git a/esphome/config.py b/esphome/config.py
index ac22db37ad..debd261b41 100644
--- a/esphome/config.py
+++ b/esphome/config.py
@@ -450,7 +450,9 @@ def validate_config(config):
         result.remove_output_path([domain], domain)
 
         # Ensure conf is a list
-        if not isinstance(conf, list) and conf:
+        if not conf:
+            result[domain] = conf = []
+        elif not isinstance(conf, list):
             result[domain] = conf = [conf]
 
         for i, p_config in enumerate(conf):
diff --git a/esphome/const.py b/esphome/const.py
index d58ed406c7..d3da18448e 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -19,6 +19,7 @@ ARDUINO_VERSION_ESP8266_DEV = 'https://github.com/platformio/platform-espressif8
                               '/stage'
 ARDUINO_VERSION_ESP8266_2_5_0 = 'espressif8266@2.0.0'
 ARDUINO_VERSION_ESP8266_2_5_1 = 'espressif8266@2.1.0'
+ARDUINO_VERSION_ESP8266_2_5_2 = 'espressif8266@2.2.0'
 ARDUINO_VERSION_ESP8266_2_3_0 = 'espressif8266@1.5.0'
 SOURCE_FILE_EXTENSIONS = {'.cpp', '.hpp', '.h', '.c', '.tcc', '.ino'}
 HEADER_FILE_EXTENSIONS = {'.h', '.hpp', '.tcc'}
diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 769a7825da..c65ca919ba 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -257,7 +257,7 @@ std::string to_string(long double val) {
 optional<float> parse_float(const std::string &str) {
   char *end;
   float value = ::strtof(str.c_str(), &end);
-  if (end == nullptr)
+  if (end == nullptr || end != str.end().base())
     return {};
   return value;
 }
diff --git a/esphome/core_config.py b/esphome/core_config.py
index a2663b8db8..d02b7c98de 100644
--- a/esphome/core_config.py
+++ b/esphome/core_config.py
@@ -11,7 +11,7 @@ from esphome.const import ARDUINO_VERSION_ESP32_DEV, ARDUINO_VERSION_ESP8266_DEV
     CONF_NAME, CONF_ON_BOOT, CONF_ON_LOOP, CONF_ON_SHUTDOWN, CONF_PLATFORM, \
     CONF_PLATFORMIO_OPTIONS, CONF_PRIORITY, CONF_TRIGGER_ID, \
     CONF_ESP8266_RESTORE_FROM_FLASH, __version__, ARDUINO_VERSION_ESP8266_2_3_0, \
-    ARDUINO_VERSION_ESP8266_2_5_0, ARDUINO_VERSION_ESP8266_2_5_1
+    ARDUINO_VERSION_ESP8266_2_5_0, ARDUINO_VERSION_ESP8266_2_5_1, ARDUINO_VERSION_ESP8266_2_5_2
 from esphome.core import CORE, coroutine_with_priority
 from esphome.pins import ESP8266_FLASH_SIZES, ESP8266_LD_SCRIPTS
 
@@ -44,6 +44,7 @@ def validate_board(value):
 validate_platform = cv.one_of('ESP32', 'ESP8266', upper=True)
 
 PLATFORMIO_ESP8266_LUT = {
+    '2.5.2': 'espressif8266@2.2.0',
     '2.5.1': 'espressif8266@2.1.0',
     '2.5.0': 'espressif8266@2.0.1',
     '2.4.2': 'espressif8266@1.8.0',
@@ -193,7 +194,7 @@ def to_code(config):
                                     'espressif8266@1.6.0'):
             ld_script = ld_scripts[0]
         elif CORE.arduino_version in (ARDUINO_VERSION_ESP8266_DEV, ARDUINO_VERSION_ESP8266_2_5_0,
-                                      ARDUINO_VERSION_ESP8266_2_5_1):
+                                      ARDUINO_VERSION_ESP8266_2_5_1, ARDUINO_VERSION_ESP8266_2_5_2):
             ld_script = ld_scripts[1]
 
         if ld_script is not None:
diff --git a/script/clang-format b/script/clang-format
index d5792c783e..89a5acd746 100755
--- a/script/clang-format
+++ b/script/clang-format
@@ -13,7 +13,7 @@ import threading
 import click
 
 sys.path.append(os.path.dirname(__file__))
-from helpers import basepath, get_output, walk_files, filter_changed
+from helpers import basepath, get_output, git_ls_files, filter_changed
 
 is_py2 = sys.version[0] == '2'
 
@@ -83,7 +83,7 @@ def main():
         return 1
 
     files = []
-    for path in walk_files(basepath):
+    for path in git_ls_files():
         filetypes = ('.cpp', '.h', '.tcc')
         ext = os.path.splitext(path)[1]
         if ext in filetypes:
diff --git a/script/clang-tidy b/script/clang-tidy
index 124008a873..39df87df22 100755
--- a/script/clang-tidy
+++ b/script/clang-tidy
@@ -18,7 +18,7 @@ import threading
 
 sys.path.append(os.path.dirname(__file__))
 from helpers import basepath, shlex_quote, get_output, build_compile_commands, \
-    build_all_include, temp_header_file, walk_files, filter_changed
+    build_all_include, temp_header_file, git_ls_files, filter_changed
 
 is_py2 = sys.version[0] == '2'
 
@@ -100,7 +100,7 @@ def main():
     build_compile_commands()
 
     files = []
-    for path in walk_files(basepath):
+    for path in git_ls_files():
         filetypes = ('.cpp',)
         ext = os.path.splitext(path)[1]
         if ext in filetypes:
diff --git a/script/helpers.py b/script/helpers.py
index 8b37dce570..243dfde49e 100644
--- a/script/helpers.py
+++ b/script/helpers.py
@@ -126,3 +126,13 @@ def filter_changed(files):
     for c in files:
         print("    {}".format(c))
     return files
+
+
+def git_ls_files():
+    command = ['git', 'ls-files', '-s']
+    proc = subprocess.Popen(command, stdout=subprocess.PIPE)
+    output, err = proc.communicate()
+    lines = [x.split() for x in output.decode('utf-8').splitlines()]
+    return {
+        s[3].strip(): int(s[0]) for s in lines
+    }
diff --git a/script/lint-python b/script/lint-python
index cb702bf362..415efa0ebf 100755
--- a/script/lint-python
+++ b/script/lint-python
@@ -9,7 +9,7 @@ import re
 import sys
 
 sys.path.append(os.path.dirname(__file__))
-from helpers import basepath, get_output, walk_files, filter_changed
+from helpers import get_output, git_ls_files, filter_changed
 
 
 def main():
@@ -21,10 +21,10 @@ def main():
     args = parser.parse_args()
 
     files = []
-    for path in walk_files(basepath):
+    for path in git_ls_files():
         filetypes = ('.py',)
         ext = os.path.splitext(path)[1]
-        if ext in filetypes:
+        if ext in filetypes and path.startswith('esphome'):
             path = os.path.relpath(path, os.getcwd())
             files.append(path)
     # Match against re
@@ -35,6 +35,8 @@ def main():
         files = filter_changed(files)
 
     files.sort()
+    if not files:
+        sys.exit(0)
 
     errors = collections.defaultdict(list)
     cmd = ['flake8'] + files
diff --git a/tests/custom.h b/tests/custom.h
index 0c30437b8c..7a5edbbf61 100644
--- a/tests/custom.h
+++ b/tests/custom.h
@@ -3,38 +3,26 @@
 
 class CustomSensor : public Component, public Sensor {
  public:
-  void loop() override {
-    publish_state(42.0);
-  }
+  void loop() override { publish_state(42.0); }
 };
 
 class CustomTextSensor : public Component, public TextSensor {
  public:
-  void loop() override {
-    publish_state("Hello World");
-  }
+  void loop() override { publish_state("Hello World"); }
 };
 
 class CustomBinarySensor : public Component, public BinarySensor {
  public:
-  void loop() override {
-    publish_state(false);
-  }
+  void loop() override { publish_state(false); }
 };
 
 class CustomSwitch : public Switch {
  protected:
-  void write_state(bool state) override {
-    ESP_LOGD("custom_switch", "Setting %s", ONOFF(state));
-  }
+  void write_state(bool state) override { ESP_LOGD("custom_switch", "Setting %s", ONOFF(state)); }
 };
 
 class CustomComponent : public PollingComponent {
  public:
-  void setup() override {
-    ESP_LOGD("custom_component", "Setup");
-  }
-  void update() override {
-    ESP_LOGD("custom_component", "Update");
-  }
+  void setup() override { ESP_LOGD("custom_component", "Setup"); }
+  void update() override { ESP_LOGD("custom_component", "Update"); }
 };
diff --git a/tests/livingroom32.cpp b/tests/livingroom32.cpp
index af4a713b6a..7005ec95e0 100644
--- a/tests/livingroom32.cpp
+++ b/tests/livingroom32.cpp
@@ -11,7 +11,7 @@ void setup() {
   App.init_ota()->start_safe_mode();
 
   // LEDC is only available on ESP32! for the ESP8266, take a look at App.make_esp8266_pwm_output().
-  auto *red = App.make_ledc_output(32); // on pin 32
+  auto *red = App.make_ledc_output(32);  // on pin 32
   auto *green = App.make_ledc_output(33);
   auto *blue = App.make_ledc_output(34);
   App.make_rgb_light("Livingroom Light", red, green, blue);
@@ -23,6 +23,4 @@ void setup() {
   App.setup();
 }
 
-void loop() {
-  App.loop();
-}
+void loop() { App.loop(); }
diff --git a/tests/livingroom8266.cpp b/tests/livingroom8266.cpp
index cd43395d75..ad017ce73b 100644
--- a/tests/livingroom8266.cpp
+++ b/tests/livingroom8266.cpp
@@ -29,6 +29,4 @@ void setup() {
   App.setup();
 }
 
-void loop() {
-  App.loop();
-}
+void loop() { App.loop(); }
diff --git a/tests/test2.yaml b/tests/test2.yaml
index 2b7ddebf3c..e3a9b0da85 100644
--- a/tests/test2.yaml
+++ b/tests/test2.yaml
@@ -238,3 +238,6 @@ interval:
   interval: 5s
   then:
     - logger.log: "Interval Run"
+
+display:
+