diff --git a/esphome/components/bme680_bsec/__init__.py b/esphome/components/bme680_bsec/__init__.py
index d258819aa4..38da18d702 100644
--- a/esphome/components/bme680_bsec/__init__.py
+++ b/esphome/components/bme680_bsec/__init__.py
@@ -2,6 +2,7 @@ import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome.components import i2c
 from esphome.const import CONF_ID
+from esphome.core import CORE
 
 CODEOWNERS = ["@trvrnrth"]
 DEPENDENCIES = ["i2c"]
@@ -44,7 +45,8 @@ CONFIG_SCHEMA = cv.Schema(
         cv.Optional(
             CONF_STATE_SAVE_INTERVAL, default="6hours"
         ): cv.positive_time_period_minutes,
-    }
+    },
+    cv.only_with_arduino,
 ).extend(i2c.i2c_device_schema(0x76))
 
 
@@ -60,5 +62,9 @@ async def to_code(config):
         var.set_state_save_interval(config[CONF_STATE_SAVE_INTERVAL].total_milliseconds)
     )
 
+    if CORE.is_esp32:
+        # Although this component does not use SPI, the BSEC library requires the SPI library
+        cg.add_library("SPI", None)
+
     cg.add_define("USE_BSEC")
     cg.add_library("BSEC Software Library", "1.6.1480")
diff --git a/esphome/components/esp32/__init__.py b/esphome/components/esp32/__init__.py
index 704f9bb3e8..09eabe1fa7 100644
--- a/esphome/components/esp32/__init__.py
+++ b/esphome/components/esp32/__init__.py
@@ -21,12 +21,16 @@ from esphome.core import CORE, HexInt
 import esphome.config_validation as cv
 import esphome.codegen as cg
 
-from .const import (
+from .const import (  # noqa
     KEY_BOARD,
     KEY_ESP32,
     KEY_SDKCONFIG_OPTIONS,
     KEY_VARIANT,
+    VARIANT_ESP32,
+    VARIANT_ESP32S2,
+    VARIANT_ESP32S3,
     VARIANT_ESP32C3,
+    VARIANT_ESP32H2,
     VARIANTS,
 )
 
diff --git a/esphome/components/light/addressable_light.cpp b/esphome/components/light/addressable_light.cpp
index f3e6c0ef1d..a8e0c7b762 100644
--- a/esphome/components/light/addressable_light.cpp
+++ b/esphome/components/light/addressable_light.cpp
@@ -79,7 +79,7 @@ optional<LightColorValues> AddressableLightTransformer::apply() {
   // dynamically-calculated alpha values to match the look.
 
   float denom = (1.0f - smoothed_progress);
-  float alpha = denom == 0.0f ? 0.0f : (smoothed_progress - this->last_transition_progress_) / denom;
+  float alpha = denom == 0.0f ? 1.0f : (smoothed_progress - this->last_transition_progress_) / denom;
 
   // We need to use a low-resolution alpha here which makes the transition set in only after ~half of the length
   // We solve this by accumulating the fractional part of the alpha over time.
diff --git a/esphome/components/light/addressable_light_wrapper.h b/esphome/components/light/addressable_light_wrapper.h
index cd5bcabd47..d358502430 100644
--- a/esphome/components/light/addressable_light_wrapper.h
+++ b/esphome/components/light/addressable_light_wrapper.h
@@ -16,24 +16,94 @@ class AddressableLightWrapper : public light::AddressableLight {
 
   void clear_effect_data() override { this->wrapper_state_[4] = 0; }
 
-  light::LightTraits get_traits() override { return this->light_state_->get_traits(); }
+  light::LightTraits get_traits() override {
+    LightTraits traits;
+
+    // Choose which color mode to use.
+    // This is ordered by how closely each color mode matches the underlying RGBW data structure used in LightPartition.
+    ColorMode color_mode_precedence[] = {ColorMode::RGB_WHITE,
+                                         ColorMode::RGB_COLD_WARM_WHITE,
+                                         ColorMode::RGB_COLOR_TEMPERATURE,
+                                         ColorMode::RGB,
+                                         ColorMode::WHITE,
+                                         ColorMode::COLD_WARM_WHITE,
+                                         ColorMode::COLOR_TEMPERATURE,
+                                         ColorMode::BRIGHTNESS,
+                                         ColorMode::ON_OFF,
+                                         ColorMode::UNKNOWN};
+
+    LightTraits parent_traits = this->light_state_->get_traits();
+    for (auto cm : color_mode_precedence) {
+      if (parent_traits.supports_color_mode(cm)) {
+        this->color_mode_ = cm;
+        break;
+      }
+    }
+
+    // Report a color mode that's compatible with both the partition and the underlying light
+    switch (this->color_mode_) {
+      case ColorMode::RGB_WHITE:
+      case ColorMode::RGB_COLD_WARM_WHITE:
+      case ColorMode::RGB_COLOR_TEMPERATURE:
+        traits.set_supported_color_modes({light::ColorMode::RGB_WHITE});
+        break;
+
+      case ColorMode::RGB:
+        traits.set_supported_color_modes({light::ColorMode::RGB});
+        break;
+
+      case ColorMode::WHITE:
+      case ColorMode::COLD_WARM_WHITE:
+      case ColorMode::COLOR_TEMPERATURE:
+      case ColorMode::BRIGHTNESS:
+        traits.set_supported_color_modes({light::ColorMode::BRIGHTNESS});
+        break;
+
+      case ColorMode::ON_OFF:
+        traits.set_supported_color_modes({light::ColorMode::ON_OFF});
+        break;
+
+      default:
+        traits.set_supported_color_modes({light::ColorMode::UNKNOWN});
+    }
+
+    return traits;
+  }
 
   void write_state(light::LightState *state) override {
+    // Don't overwrite state if the underlying light is turned on
+    if (this->light_state_->remote_values.is_on()) {
+      this->mark_shown_();
+      return;
+    }
+
     float gamma = this->light_state_->get_gamma_correct();
     float r = gamma_uncorrect(this->wrapper_state_[0] / 255.0f, gamma);
     float g = gamma_uncorrect(this->wrapper_state_[1] / 255.0f, gamma);
     float b = gamma_uncorrect(this->wrapper_state_[2] / 255.0f, gamma);
     float w = gamma_uncorrect(this->wrapper_state_[3] / 255.0f, gamma);
-    float brightness = fmaxf(r, fmaxf(g, b));
 
     auto call = this->light_state_->make_call();
-    call.set_state(true);
-    call.set_brightness_if_supported(1.0f);
-    call.set_color_brightness_if_supported(brightness);
-    call.set_red_if_supported(r);
-    call.set_green_if_supported(g);
-    call.set_blue_if_supported(b);
-    call.set_white_if_supported(w);
+
+    float color_brightness = fmaxf(r, fmaxf(g, b));
+    float brightness = fmaxf(color_brightness, w);
+    if (brightness == 0.0f) {
+      call.set_state(false);
+    } else {
+      color_brightness /= brightness;
+      w /= brightness;
+
+      call.set_state(true);
+      call.set_color_mode_if_supported(this->color_mode_);
+      call.set_brightness_if_supported(brightness);
+      call.set_color_brightness_if_supported(color_brightness);
+      call.set_red_if_supported(r);
+      call.set_green_if_supported(g);
+      call.set_blue_if_supported(b);
+      call.set_white_if_supported(w);
+      call.set_warm_white_if_supported(w);
+      call.set_cold_white_if_supported(w);
+    }
     call.set_transition_length_if_supported(0);
     call.set_publish(false);
     call.set_save(false);
@@ -50,6 +120,7 @@ class AddressableLightWrapper : public light::AddressableLight {
 
   light::LightState *light_state_;
   uint8_t *wrapper_state_;
+  ColorMode color_mode_{ColorMode::UNKNOWN};
 };
 
 }  // namespace light
diff --git a/esphome/components/light/light_transformer.h b/esphome/components/light/light_transformer.h
index dd904d0eed..35b045d5b4 100644
--- a/esphome/components/light/light_transformer.h
+++ b/esphome/components/light/light_transformer.h
@@ -39,7 +39,15 @@ class LightTransformer {
 
  protected:
   /// The progress of this transition, on a scale of 0 to 1.
-  float get_progress_() { return clamp((millis() - this->start_time_) / float(this->length_), 0.0f, 1.0f); }
+  float get_progress_() {
+    uint32_t now = esphome::millis();
+    if (now < this->start_time_)
+      return 0.0f;
+    if (now >= this->start_time_ + this->length_)
+      return 1.0f;
+
+    return clamp((now - this->start_time_) / float(this->length_), 0.0f, 1.0f);
+  }
 
   uint32_t start_time_;
   uint32_t length_;
diff --git a/esphome/components/light/transformers.h b/esphome/components/light/transformers.h
index 90646f4e61..a557bd39b1 100644
--- a/esphome/components/light/transformers.h
+++ b/esphome/components/light/transformers.h
@@ -18,10 +18,13 @@ class LightTransitionTransformer : public LightTransformer {
       this->start_values_.set_brightness(0.0f);
     }
 
-    // When turning light off from on state, use source state and only decrease brightness to zero.
+    // When turning light off from on state, use source state and only decrease brightness to zero. Use a second
+    // variable for transition end state, as overwriting target_values breaks LightState logic.
     if (this->start_values_.is_on() && !this->target_values_.is_on()) {
-      this->target_values_ = LightColorValues(this->start_values_);
-      this->target_values_.set_brightness(0.0f);
+      this->end_values_ = LightColorValues(this->start_values_);
+      this->end_values_.set_brightness(0.0f);
+    } else {
+      this->end_values_ = LightColorValues(this->target_values_);
     }
 
     // When changing color mode, go through off state, as color modes are orthogonal and there can't be two active.
@@ -43,7 +46,7 @@ class LightTransitionTransformer : public LightTransformer {
     }
 
     LightColorValues &start = this->changing_color_mode_ && p > 0.5f ? this->intermediate_values_ : this->start_values_;
-    LightColorValues &end = this->changing_color_mode_ && p < 0.5f ? this->intermediate_values_ : this->target_values_;
+    LightColorValues &end = this->changing_color_mode_ && p < 0.5f ? this->intermediate_values_ : this->end_values_;
     if (this->changing_color_mode_)
       p = p < 0.5f ? p * 2 : (p - 0.5) * 2;
 
@@ -57,6 +60,7 @@ class LightTransitionTransformer : public LightTransformer {
   static float smoothed_progress(float x) { return x * x * x * (x * (x * 6.0f - 15.0f) + 10.0f); }
 
   bool changing_color_mode_{false};
+  LightColorValues end_values_{};
   LightColorValues intermediate_values_{};
 };
 
@@ -69,9 +73,7 @@ class LightFlashTransformer : public LightTransformer {
     if (this->transition_length_ * 2 > this->length_)
       this->transition_length_ = this->length_ / 2;
 
-    // do not create transition if length is 0
-    if (this->transition_length_ == 0)
-      return;
+    this->begun_lightstate_restore_ = false;
 
     // first transition to original target
     this->transformer_ = this->state_.get_output()->create_default_transition();
@@ -79,40 +81,45 @@ class LightFlashTransformer : public LightTransformer {
   }
 
   optional<LightColorValues> apply() override {
-    // transition transformer does not handle 0 length as progress returns nan
-    if (this->transition_length_ == 0)
-      return this->target_values_;
+    optional<LightColorValues> result = {};
+
+    if (this->transformer_ == nullptr && millis() > this->start_time_ + this->length_ - this->transition_length_) {
+      // second transition back to start value
+      this->transformer_ = this->state_.get_output()->create_default_transition();
+      this->transformer_->setup(this->state_.current_values, this->get_start_values(), this->transition_length_);
+      this->begun_lightstate_restore_ = true;
+    }
 
     if (this->transformer_ != nullptr) {
-      if (!this->transformer_->is_finished()) {
-        return this->transformer_->apply();
-      } else {
+      result = this->transformer_->apply();
+
+      if (this->transformer_->is_finished()) {
         this->transformer_->stop();
         this->transformer_ = nullptr;
       }
     }
 
-    if (millis() > this->start_time_ + this->length_ - this->transition_length_) {
-      // second transition back to start value
-      this->transformer_ = this->state_.get_output()->create_default_transition();
-      this->transformer_->setup(this->state_.current_values, this->get_start_values(), this->transition_length_);
-    }
-
-    // once transition is complete, don't change states until next transition
-    return optional<LightColorValues>();
+    return result;
   }
 
   // Restore the original values after the flash.
   void stop() override {
+    if (this->transformer_ != nullptr) {
+      this->transformer_->stop();
+      this->transformer_ = nullptr;
+    }
     this->state_.current_values = this->get_start_values();
     this->state_.remote_values = this->get_start_values();
     this->state_.publish_state();
   }
 
+  bool is_finished() override { return this->begun_lightstate_restore_ && LightTransformer::is_finished(); }
+
  protected:
   LightState &state_;
   uint32_t transition_length_;
   std::unique_ptr<LightTransformer> transformer_{nullptr};
+  bool begun_lightstate_restore_;
 };
 
 }  // namespace light
diff --git a/esphome/components/logger/__init__.py b/esphome/components/logger/__init__.py
index bc1bc6bb41..fe2a3ec8f8 100644
--- a/esphome/components/logger/__init__.py
+++ b/esphome/components/logger/__init__.py
@@ -19,6 +19,7 @@ from esphome.const import (
     CONF_TX_BUFFER_SIZE,
 )
 from esphome.core import CORE, EsphomeError, Lambda, coroutine_with_priority
+from esphome.components.esp32 import get_esp32_variant, VARIANT_ESP32S2, VARIANT_ESP32C3
 
 CODEOWNERS = ["@esphome/core"]
 logger_ns = cg.esphome_ns.namespace("logger")
@@ -52,6 +53,10 @@ LOG_LEVEL_SEVERITY = [
     "VERY_VERBOSE",
 ]
 
+ESP32_REDUCED_VARIANTS = [VARIANT_ESP32C3, VARIANT_ESP32S2]
+
+UART_SELECTION_ESP32_REDUCED = ["UART0", "UART1"]
+
 UART_SELECTION_ESP32 = ["UART0", "UART1", "UART2"]
 
 UART_SELECTION_ESP8266 = ["UART0", "UART0_SWAP", "UART1"]
@@ -75,6 +80,8 @@ is_log_level = cv.one_of(*LOG_LEVELS, upper=True)
 
 def uart_selection(value):
     if CORE.is_esp32:
+        if get_esp32_variant() in ESP32_REDUCED_VARIANTS:
+            return cv.one_of(*UART_SELECTION_ESP32_REDUCED, upper=True)(value)
         return cv.one_of(*UART_SELECTION_ESP32, upper=True)(value)
     if CORE.is_esp8266:
         return cv.one_of(*UART_SELECTION_ESP8266, upper=True)(value)
diff --git a/esphome/components/logger/logger.cpp b/esphome/components/logger/logger.cpp
index 2d85969bf3..97ad4c2cb9 100644
--- a/esphome/components/logger/logger.cpp
+++ b/esphome/components/logger/logger.cpp
@@ -153,13 +153,9 @@ void Logger::pre_setup() {
       case UART_SELECTION_UART1:
         this->hw_serial_ = &Serial1;
         break;
-#ifdef USE_ESP32
+#if defined(USE_ESP32) && !defined(USE_ESP32_VARIANT_ESP32C3) && !defined(USE_ESP32_VARIANT_ESP32S2)
       case UART_SELECTION_UART2:
-#if !CONFIG_IDF_TARGET_ESP32S2 && !CONFIG_IDF_TARGET_ESP32C3
-        // FIXME: Validate in config that UART2 can't be set for ESP32-S2 (only has
-        // UART0-UART1)
         this->hw_serial_ = &Serial2;
-#endif
         break;
 #endif
     }
@@ -173,9 +169,11 @@ void Logger::pre_setup() {
       case UART_SELECTION_UART1:
         uart_num_ = UART_NUM_1;
         break;
+#if defined(USE_ESP32) && !defined(USE_ESP32_VARIANT_ESP32C3) && !defined(USE_ESP32_VARIANT_ESP32S2)
       case UART_SELECTION_UART2:
         uart_num_ = UART_NUM_2;
         break;
+#endif
     }
     uart_config_t uart_config{};
     uart_config.baud_rate = (int) baud_rate_;
diff --git a/esphome/components/logger/logger.h b/esphome/components/logger/logger.h
index e6fa6e2058..8756bc2387 100644
--- a/esphome/components/logger/logger.h
+++ b/esphome/components/logger/logger.h
@@ -24,7 +24,7 @@ namespace logger {
 enum UARTSelection {
   UART_SELECTION_UART0 = 0,
   UART_SELECTION_UART1,
-#ifdef USE_ESP32
+#if defined(USE_ESP32) && !defined(USE_ESP32_VARIANT_ESP32C3) && !defined(USE_ESP32_VARIANT_ESP32S2)
   UART_SELECTION_UART2,
 #endif
 #ifdef USE_ESP8266
diff --git a/esphome/components/sgp30/sgp30.cpp b/esphome/components/sgp30/sgp30.cpp
index 1a64a12907..87cf0fa61a 100644
--- a/esphome/components/sgp30/sgp30.cpp
+++ b/esphome/components/sgp30/sgp30.cpp
@@ -1,4 +1,5 @@
 #include "sgp30.h"
+#include "esphome/core/hal.h"
 #include "esphome/core/log.h"
 #include "esphome/core/application.h"
 #include <cinttypes>
diff --git a/esphome/const.py b/esphome/const.py
index 456b6d9209..eacbb19a7f 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2021.10.0b2"
+__version__ = "2021.10.0b3"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"