diff --git a/esphome/components/ccs811/ccs811.cpp b/esphome/components/ccs811/ccs811.cpp
index 538d7fe1f5..e7928d4d8b 100644
--- a/esphome/components/ccs811/ccs811.cpp
+++ b/esphome/components/ccs811/ccs811.cpp
@@ -102,10 +102,14 @@ void CCS811Component::send_env_data_() {
   // temperature has a 25° offset to allow negative temperatures
   temperature += 25;
 
-  // only 0.5 fractions are supported (application note)
-  auto hum_value = static_cast<uint8_t>(roundf(humidity * 2));
-  auto temp_value = static_cast<uint8_t>(roundf(temperature * 2));
-  this->write_bytes(0x05, {hum_value, 0x00, temp_value, 0x00});
+  // At page 18 of:
+  // https://cdn.sparkfun.com/datasheets/BreakoutBoards/CCS811_Programming_Guide.pdf
+  // Reference code:
+  // https://github.com/adafruit/Adafruit_CCS811/blob/0990f5c620354d8bc087c4706bec091d8e6e5dfd/Adafruit_CCS811.cpp#L135-L142
+  uint16_t hum_conv = static_cast<uint16_t>(lroundf(humidity * 512.0f + 0.5f));
+  uint16_t temp_conv = static_cast<uint16_t>(lroundf(temperature * 512.0f + 0.5f));
+  this->write_bytes(0x05, {(uint8_t)((hum_conv >> 8) & 0xff), (uint8_t)((hum_conv & 0xff)),
+                           (uint8_t)((temp_conv >> 8) & 0xff), (uint8_t)((temp_conv & 0xff))});
 }
 void CCS811Component::dump_config() {
   ESP_LOGCONFIG(TAG, "CCS811");
diff --git a/esphome/components/ds1307/ds1307.cpp b/esphome/components/ds1307/ds1307.cpp
index 599ec16e4f..2f33768132 100644
--- a/esphome/components/ds1307/ds1307.cpp
+++ b/esphome/components/ds1307/ds1307.cpp
@@ -16,7 +16,7 @@ void DS1307Component::setup() {
   }
 }
 
-void DS1307Component::update() { this->read(); }
+void DS1307Component::update() { this->read_time(); }
 
 void DS1307Component::dump_config() {
   ESP_LOGCONFIG(TAG, "DS1307:");
@@ -29,7 +29,7 @@ void DS1307Component::dump_config() {
 
 float DS1307Component::get_setup_priority() const { return setup_priority::DATA; }
 
-void DS1307Component::read() {
+void DS1307Component::read_time() {
   if (!this->read_rtc_()) {
     return;
   }
@@ -53,7 +53,7 @@ void DS1307Component::read() {
   time::RealTimeClock::synchronize_epoch_(rtc_time.timestamp);
 }
 
-void DS1307Component::write() {
+void DS1307Component::write_time() {
   auto now = time::RealTimeClock::utcnow();
   if (!now.is_valid()) {
     ESP_LOGE(TAG, "Invalid system time, not syncing to RTC.");
diff --git a/esphome/components/ds1307/ds1307.h b/esphome/components/ds1307/ds1307.h
index 8e318bf395..2e9ac2275c 100644
--- a/esphome/components/ds1307/ds1307.h
+++ b/esphome/components/ds1307/ds1307.h
@@ -13,8 +13,8 @@ class DS1307Component : public time::RealTimeClock, public i2c::I2CDevice {
   void update() override;
   void dump_config() override;
   float get_setup_priority() const override;
-  void read();
-  void write();
+  void read_time();
+  void write_time();
 
  protected:
   bool read_rtc_();
@@ -59,12 +59,12 @@ class DS1307Component : public time::RealTimeClock, public i2c::I2CDevice {
 
 template<typename... Ts> class WriteAction : public Action<Ts...>, public Parented<DS1307Component> {
  public:
-  void play(Ts... x) override { this->parent_->write(); }
+  void play(Ts... x) override { this->parent_->write_time(); }
 };
 
 template<typename... Ts> class ReadAction : public Action<Ts...>, public Parented<DS1307Component> {
  public:
-  void play(Ts... x) override { this->parent_->read(); }
+  void play(Ts... x) override { this->parent_->read_time(); }
 };
 }  // namespace ds1307
 }  // namespace esphome
diff --git a/esphome/components/ds1307/time.py b/esphome/components/ds1307/time.py
index c381fb7b2a..371dc85be8 100644
--- a/esphome/components/ds1307/time.py
+++ b/esphome/components/ds1307/time.py
@@ -18,19 +18,19 @@ CONFIG_SCHEMA = time.TIME_SCHEMA.extend({
 }).extend(i2c.i2c_device_schema(0x68))
 
 
-@automation.register_action('ds1307.write', WriteAction, cv.Schema({
+@automation.register_action('ds1307.write_time', WriteAction, cv.Schema({
     cv.GenerateID(): cv.use_id(DS1307Component),
 }))
-def ds1307_write_to_code(config, action_id, template_arg, args):
+def ds1307_write_time_to_code(config, action_id, template_arg, args):
     var = cg.new_Pvariable(action_id, template_arg)
     yield cg.register_parented(var, config[CONF_ID])
     yield var
 
 
-@automation.register_action('ds1307.read', ReadAction, automation.maybe_simple_id({
+@automation.register_action('ds1307.read_time', ReadAction, automation.maybe_simple_id({
     cv.GenerateID(): cv.use_id(DS1307Component),
 }))
-def ds1307_read_to_code(config, action_id, template_arg, args):
+def ds1307_read_time_to_code(config, action_id, template_arg, args):
     var = cg.new_Pvariable(action_id, template_arg)
     yield cg.register_parented(var, config[CONF_ID])
     yield var
diff --git a/esphome/components/light/addressable_light.h b/esphome/components/light/addressable_light.h
index a95d70f274..4e7ec4b931 100644
--- a/esphome/components/light/addressable_light.h
+++ b/esphome/components/light/addressable_light.h
@@ -149,10 +149,10 @@ struct ESPColor {
     return ESPColor(uint8_t((uint16_t(r) * 255U / max_rgb)), uint8_t((uint16_t(g) * 255U / max_rgb)),
                     uint8_t((uint16_t(b) * 255U / max_rgb)), w);
   }
-  ESPColor fade_to_white(uint8_t amnt) { return ESPColor(255, 255, 255, 255) - (*this * amnt); }
-  ESPColor fade_to_black(uint8_t amnt) { return *this * amnt; }
-  ESPColor lighten(uint8_t delta) { return *this + delta; }
-  ESPColor darken(uint8_t delta) { return *this - delta; }
+  ESPColor fade_to_white(uint8_t amnt) const { return ESPColor(255, 255, 255, 255) - (*this * amnt); }
+  ESPColor fade_to_black(uint8_t amnt) const { return *this * amnt; }
+  ESPColor lighten(uint8_t delta) const { return *this + delta; }
+  ESPColor darken(uint8_t delta) const { return *this - delta; }
 
   static const ESPColor BLACK;
   static const ESPColor WHITE;
diff --git a/esphome/components/sntp/sntp_component.cpp b/esphome/components/sntp/sntp_component.cpp
index 641d66091c..4050609dd8 100644
--- a/esphome/components/sntp/sntp_component.cpp
+++ b/esphome/components/sntp/sntp_component.cpp
@@ -54,6 +54,7 @@ void SNTPComponent::loop() {
   char buf[128];
   time.strftime(buf, sizeof(buf), "%c");
   ESP_LOGD(TAG, "Synchronized time: %s", buf);
+  this->time_sync_callback_.call();
   this->has_time_ = true;
 }
 
diff --git a/esphome/components/st7735/st7735.cpp b/esphome/components/st7735/st7735.cpp
index e433a08334..2a3d8fc903 100644
--- a/esphome/components/st7735/st7735.cpp
+++ b/esphome/components/st7735/st7735.cpp
@@ -454,6 +454,7 @@ void HOT ST7735::write_display_data_() {
   } else {
     this->write_array(this->buffer_, this->get_buffer_length());
   }
+  this->disable();
 }
 
 void ST7735::spi_master_write_addr_(uint16_t addr1, uint16_t addr2) {
diff --git a/esphome/components/time/__init__.py b/esphome/components/time/__init__.py
index e5ed5034ab..5f30a8f2ee 100644
--- a/esphome/components/time/__init__.py
+++ b/esphome/components/time/__init__.py
@@ -11,8 +11,8 @@ import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome import automation
 from esphome.const import CONF_ID, CONF_CRON, CONF_DAYS_OF_MONTH, CONF_DAYS_OF_WEEK, CONF_HOURS, \
-    CONF_MINUTES, CONF_MONTHS, CONF_ON_TIME, CONF_SECONDS, CONF_TIMEZONE, CONF_TRIGGER_ID, \
-    CONF_AT, CONF_SECOND, CONF_HOUR, CONF_MINUTE
+    CONF_MINUTES, CONF_MONTHS, CONF_ON_TIME, CONF_ON_TIME_SYNC, CONF_SECONDS, CONF_TIMEZONE, \
+    CONF_TRIGGER_ID, CONF_AT, CONF_SECOND, CONF_HOUR, CONF_MINUTE
 from esphome.core import coroutine, coroutine_with_priority
 from esphome.automation import Condition
 
@@ -24,6 +24,7 @@ IS_PLATFORM_COMPONENT = True
 time_ns = cg.esphome_ns.namespace('time')
 RealTimeClock = time_ns.class_('RealTimeClock', cg.PollingComponent)
 CronTrigger = time_ns.class_('CronTrigger', automation.Trigger.template(), cg.Component)
+SyncTrigger = time_ns.class_('SyncTrigger', automation.Trigger.template(), cg.Component)
 ESPTime = time_ns.struct('ESPTime')
 TimeHasTimeCondition = time_ns.class_('TimeHasTimeCondition', Condition)
 
@@ -294,6 +295,9 @@ TIME_SCHEMA = cv.Schema({
         cv.Optional(CONF_CRON): validate_cron_raw,
         cv.Optional(CONF_AT): validate_time_at,
     }, validate_cron_keys),
+    cv.Optional(CONF_ON_TIME_SYNC): automation.validate_automation({
+        cv.GenerateID(CONF_TRIGGER_ID): cv.declare_id(SyncTrigger),
+    }),
 }).extend(cv.polling_component_schema('15min'))
 
 
@@ -320,6 +324,12 @@ def setup_time_core_(time_var, config):
         yield cg.register_component(trigger, conf)
         yield automation.build_automation(trigger, [], conf)
 
+    for conf in config.get(CONF_ON_TIME_SYNC, []):
+        trigger = cg.new_Pvariable(conf[CONF_TRIGGER_ID], time_var)
+
+        yield cg.register_component(trigger, conf)
+        yield automation.build_automation(trigger, [], conf)
+
 
 @coroutine
 def register_time(time_var, config):
diff --git a/esphome/components/time/automation.cpp b/esphome/components/time/automation.cpp
index 1232e6f834..8e41fba0da 100644
--- a/esphome/components/time/automation.cpp
+++ b/esphome/components/time/automation.cpp
@@ -75,5 +75,9 @@ void CronTrigger::add_days_of_week(const std::vector<uint8_t> &days_of_week) {
 }
 float CronTrigger::get_setup_priority() const { return setup_priority::HARDWARE; }
 
+SyncTrigger::SyncTrigger(RealTimeClock *rtc) : rtc_(rtc) {
+  rtc->add_on_time_sync_callback([this]() { this->trigger(); });
+}
+
 }  // namespace time
 }  // namespace esphome
diff --git a/esphome/components/time/automation.h b/esphome/components/time/automation.h
index 978d25fbd4..6167aac4f7 100644
--- a/esphome/components/time/automation.h
+++ b/esphome/components/time/automation.h
@@ -37,5 +37,12 @@ class CronTrigger : public Trigger<>, public Component {
   optional<ESPTime> last_check_;
 };
 
+class SyncTrigger : public Trigger<>, public Component {
+ public:
+  explicit SyncTrigger(RealTimeClock *rtc);
+
+ protected:
+  RealTimeClock *rtc_;
+};
 }  // namespace time
 }  // namespace esphome
diff --git a/esphome/components/time/real_time_clock.cpp b/esphome/components/time/real_time_clock.cpp
index 7d7c1013dd..44ff505ecc 100644
--- a/esphome/components/time/real_time_clock.cpp
+++ b/esphome/components/time/real_time_clock.cpp
@@ -38,6 +38,8 @@ void RealTimeClock::synchronize_epoch_(uint32_t epoch) {
   char buf[128];
   time.strftime(buf, sizeof(buf), "%c");
   ESP_LOGD(TAG, "Synchronized time: %s", buf);
+
+  this->time_sync_callback_.call();
 }
 
 size_t ESPTime::strftime(char *buffer, size_t buffer_len, const char *format) {
diff --git a/esphome/components/time/real_time_clock.h b/esphome/components/time/real_time_clock.h
index 880a4e9d5c..a809401c33 100644
--- a/esphome/components/time/real_time_clock.h
+++ b/esphome/components/time/real_time_clock.h
@@ -127,11 +127,17 @@ class RealTimeClock : public PollingComponent {
 
   void call_setup() override;
 
+  void add_on_time_sync_callback(std::function<void()> callback) {
+    this->time_sync_callback_.add(std::move(callback));
+  };
+
  protected:
   /// Report a unix epoch as current time.
   void synchronize_epoch_(uint32_t epoch);
 
   std::string timezone_{};
+
+  CallbackManager<void()> time_sync_callback_;
 };
 
 template<typename... Ts> class TimeHasTimeCondition : public Condition<Ts...> {
diff --git a/esphome/const.py b/esphome/const.py
index 4a5dd2665e..a96d38eb75 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -2,7 +2,7 @@
 
 MAJOR_VERSION = 1
 MINOR_VERSION = 16
-PATCH_VERSION = '0b4'
+PATCH_VERSION = '0b5'
 __short_version__ = f'{MAJOR_VERSION}.{MINOR_VERSION}'
 __version__ = f'{__short_version__}.{PATCH_VERSION}'
 
@@ -350,6 +350,7 @@ CONF_ON_SHUTDOWN = 'on_shutdown'
 CONF_ON_STATE = 'on_state'
 CONF_ON_TAG = 'on_tag'
 CONF_ON_TIME = 'on_time'
+CONF_ON_TIME_SYNC = 'on_time_sync'
 CONF_ON_TURN_OFF = 'on_turn_off'
 CONF_ON_TURN_ON = 'on_turn_on'
 CONF_ON_VALUE = 'on_value'
diff --git a/tests/test1.yaml b/tests/test1.yaml
index f2ebca05ab..5aed1dac44 100644
--- a/tests/test1.yaml
+++ b/tests/test1.yaml
@@ -1854,12 +1854,9 @@ time:
       then:
         - lambda: 'ESP_LOGD("main", "time");'
   - platform: gps
-    update_interval: 1h
-    on_time:
-      seconds: 0
-      minutes: /15
+    on_time_sync:
       then:
-        ds1307.write:
+        ds1307.write_time:
           id: ds1307_time
   - platform: ds1307
     id: ds1307_time
@@ -1867,7 +1864,7 @@ time:
     on_time:
       seconds: 0
       then:
-          ds1307.read
+        ds1307.read_time
 
 cover:
   - platform: template