Add KMeterISO component. (#5170)

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

esphome/components/kmeteriso/kmeteriso.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/i2c/i2c_bus.h"
+
+namespace esphome {
+namespace kmeteriso {
+
+/// This class implements support for the KMeterISO thermocouple sensor.
+class KMeterISOComponent : public PollingComponent, public i2c::I2CDevice {
+ public:
+  void set_temperature_sensor(sensor::Sensor *t) { this->temperature_sensor_ = t; }
+  void set_internal_temperature_sensor(sensor::Sensor *t) { this->internal_temperature_sensor_ = t; }
+
+  // ========== INTERNAL METHODS ==========
+  // (In most use cases you won't need these)
+  void setup() override;
+  float get_setup_priority() const override;
+  void update() override;
+
+ protected:
+  sensor::Sensor *temperature_sensor_{nullptr};
+  sensor::Sensor *internal_temperature_sensor_{nullptr};
+  enum ErrorCode {
+    NONE = 0,
+    COMMUNICATION_FAILED,
+    STATUS_FAILED,
+  } error_code_{NONE};
+};
+
+}  // namespace kmeteriso
+}  // namespace esphome