Add support for the SM300D2 7-in-1 sensor module (#1524)

* Added support for SM300D2 sensor module

* Fixed lint errors due to added tvoc config

* add device class

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/sm300d2/sm300d2.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace sm300d2 {
+
+class SM300D2Sensor : public PollingComponent, public uart::UARTDevice {
+ public:
+  float get_setup_priority() const override { return setup_priority::DATA; }
+
+  void set_co2_sensor(sensor::Sensor *co2_sensor) { co2_sensor_ = co2_sensor; }
+  void set_formaldehyde_sensor(sensor::Sensor *formaldehyde_sensor) { formaldehyde_sensor_ = formaldehyde_sensor; }
+  void set_tvoc_sensor(sensor::Sensor *tvoc_sensor) { tvoc_sensor_ = tvoc_sensor; }
+  void set_pm_2_5_sensor(sensor::Sensor *pm_2_5_sensor) { pm_2_5_sensor_ = pm_2_5_sensor; }
+  void set_pm_10_0_sensor(sensor::Sensor *pm_10_0_sensor) { pm_10_0_sensor_ = pm_10_0_sensor; }
+  void set_temperature_sensor(sensor::Sensor *temperature_sensor) { temperature_sensor_ = temperature_sensor; }
+  void set_humidity_sensor(sensor::Sensor *humidity_sensor) { humidity_sensor_ = humidity_sensor; }
+
+  void update() override;
+  void dump_config() override;
+
+ protected:
+  uint16_t sm300d2_checksum_(uint8_t *ptr);
+
+  sensor::Sensor *co2_sensor_{nullptr};
+  sensor::Sensor *formaldehyde_sensor_{nullptr};
+  sensor::Sensor *tvoc_sensor_{nullptr};
+  sensor::Sensor *pm_2_5_sensor_{nullptr};
+  sensor::Sensor *pm_10_0_sensor_{nullptr};
+  sensor::Sensor *temperature_sensor_{nullptr};
+  sensor::Sensor *humidity_sensor_{nullptr};
+};
+
+}  // namespace sm300d2
+}  // namespace esphome