SenseAir S8 CO2 sensor support (#705)

* Компилится

* Tests

* Checksum calculation

* Read status

esphome/components/senseair/senseair.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace senseair {
+
+class SenseAirComponent : 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 update() override;
+  void dump_config() override;
+
+ protected:
+  uint16_t senseair_checksum_(uint8_t *ptr, uint8_t length);
+  bool senseair_write_command_(const uint8_t *command, uint8_t *response);
+
+  sensor::Sensor *co2_sensor_{nullptr};
+};
+
+}  // namespace senseair
+}  // namespace esphome