Add T6615 (#1170)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/t6615/t6615.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/automation.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace t6615 {
+
+enum class T6615Command : uint8_t {
+  NONE = 0,
+  GET_PPM,
+  GET_SERIAL,
+  GET_VERSION,
+  GET_ELEVATION,
+  GET_ABC,
+  ENABLE_ABC,
+  DISABLE_ABC,
+  SET_ELEVATION,
+};
+
+class T6615Component : public PollingComponent, public uart::UARTDevice {
+ public:
+  float get_setup_priority() const override;
+
+  void loop() override;
+  void update() override;
+  void dump_config() override;
+
+  void set_co2_sensor(sensor::Sensor *co2_sensor) { this->co2_sensor_ = co2_sensor; }
+
+ protected:
+  void query_ppm_();
+
+  T6615Command command_ = T6615Command::NONE;
+
+  sensor::Sensor *co2_sensor_{nullptr};
+};
+
+}  // namespace t6615
+}  // namespace esphome