CCS811 support (#536)

* CCS811

* Move define, add test

* Remove sun artifact

* Lint

* Lint

esphome/components/ccs811/ccs811.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/preferences.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/i2c/i2c.h"
+
+namespace esphome {
+namespace ccs811 {
+
+class CCS811Component : public PollingComponent, public i2c::I2CDevice {
+ public:
+  void set_co2(sensor::Sensor *co2) { co2_ = co2; }
+  void set_tvoc(sensor::Sensor *tvoc) { tvoc_ = tvoc; }
+  void set_baseline(uint16_t baseline) { baseline_ = baseline; }
+
+  /// Setup the sensor and test for a connection.
+  void setup() override;
+  /// Schedule temperature+pressure readings.
+  void update() override;
+
+  void dump_config() override;
+
+  float get_setup_priority() const override { return setup_priority::DATA; }
+
+ protected:
+  optional<uint8_t> read_status_() { return this->read_byte(0x00); }
+  bool status_has_error_() { return this->read_status_().value_or(1) & 1; }
+  bool status_app_is_valid_() { return this->read_status_().value_or(0) & (1 << 4); }
+  bool status_has_data_() { return this->read_status_().value_or(0) & (1 << 3); }
+
+  enum ErrorCode {
+    UNKNOWN,
+    COMMUNICAITON_FAILED,
+    INVALID_ID,
+    SENSOR_REPORTED_ERROR,
+    APP_INVALID,
+    APP_START_FAILED,
+  } error_code_{UNKNOWN};
+
+  sensor::Sensor *co2_{nullptr};
+  sensor::Sensor *tvoc_{nullptr};
+  optional<uint16_t> baseline_{};
+};
+
+}  // namespace ccs811
+}  // namespace esphome