Hbridge christmas light (#1251)

* Hbridge Christmas light component

Can be used for Christmas lights that use 2 wires to run 2 different strings of lights using a hbridge driver.

* Add Test

NOTE: I am unable to test this via the docker image

* Update hbridge_light_output.h

* Update hbridge_light_output.h

* Update hbridge_light_output.h

* Update light.py

* Fixed duty as white value bug fixed

* lint changes

* Name case change

* thanks lint

esphome/components/hbridge/hbridge_light_output.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/output/float_output.h"
+#include "esphome/components/light/light_output.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace hbridge {
+
+// Using PollingComponent as the updates are more consistent and reduces flickering
+class HBridgeLightOutput : public PollingComponent, public light::LightOutput {
+ public:
+  HBridgeLightOutput() : PollingComponent(1) {}
+
+  void set_pina_pin(output::FloatOutput *pina_pin) { pina_pin_ = pina_pin; }
+  void set_pinb_pin(output::FloatOutput *pinb_pin) { pinb_pin_ = pinb_pin; }
+
+  light::LightTraits get_traits() override {
+    auto traits = light::LightTraits();
+    traits.set_supports_brightness(true);  // Dimming
+    traits.set_supports_rgb(false);
+    traits.set_supports_rgb_white_value(true);  // hbridge color
+    traits.set_supports_color_temperature(false);
+    return traits;
+  }
+
+  void setup() override { this->forward_direction_ = false; }
+
+  void update() override {
+    // This method runs around 60 times per second
+    // We cannot do the PWM ourselves so we are reliant on the hardware PWM
+    if (!this->forward_direction_) {  // First LED Direction
+      this->pinb_pin_->set_level(this->duty_off_);
+      this->pina_pin_->set_level(this->pina_duty_);
+      this->forward_direction_ = true;
+    } else {  // Second LED Direction
+      this->pina_pin_->set_level(this->duty_off_);
+      this->pinb_pin_->set_level(this->pinb_duty_);
+      this->forward_direction_ = false;
+    }
+  }
+
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+
+  void write_state(light::LightState *state) override {
+    float bright;
+    state->current_values_as_brightness(&bright);
+
+    state->set_gamma_correct(0);
+    float red, green, blue, white;
+    state->current_values_as_rgbw(&red, &green, &blue, &white);
+
+    if ((white / bright) > 0.55) {
+      this->pina_duty_ = (bright * (1 - (white / bright)));
+      this->pinb_duty_ = bright;
+    } else if (white < 0.45) {
+      this->pina_duty_ = bright;
+      this->pinb_duty_ = white;
+    } else {
+      this->pina_duty_ = bright;
+      this->pinb_duty_ = bright;
+    }
+  }
+
+ protected:
+  output::FloatOutput *pina_pin_;
+  output::FloatOutput *pinb_pin_;
+  float pina_duty_ = 0;
+  float pinb_duty_ = 0;
+  float duty_off_ = 0;
+  bool forward_direction_ = false;
+};
+
+}  // namespace hbridge
+}  // namespace esphome