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components/showcase_component/README.md

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+```yaml
+# example configuration:
+
+empty_i2c_component:
+  id: empty_i2c_component_1
+  address: 0x01  # optional
+
+i2c:
+  sda: 4
+  scl: 5
+```

components/showcase_component/__init__.py

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+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c, sensor, output
+from esphome.const import CONF_ID
+
+DEPENDENCIES = ['i2c']
+
+CONF_I2C_ADDR = 0x09
+
+showcase_component_ns = cg.esphome_ns.namespace('showcase_component')
+ShowcaseComponent = empty_i2c_component_ns.class_('ShowcaseComponent', cg.Component, i2c.I2CDevice)
+
+CONFIG_SCHEMA = cv.Schema(
+    {
+        cv.GenerateID(): cv.declare_id(ShowcaseComponent),
+
+        cv.Required(CONF_UPPER): cv.use_id(output.FloatOutput),
+        cv.Required(CONF_LOWER): cv.use_id(output.FloatOutput)
+    }
+).extend(cv.COMPONENT_SCHEMA).extend(i2c.i2c_device_schema(CONF_I2C_ADDR))
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield i2c.register_i2c_device(var, config)

components/showcase_component/empty_i2c_component.cpp

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+#include "esphome/core/log.h"
+#include "showcase_component.h"
+#include <Arduino.h>
+
+namespace esphome {
+namespace showcase_component {
+
+static const char *TAG = "empty_i2c_component.component";
+
+void ShowcaseComponent::setup() {
+}
+
+void ShowcaseComponent::loop() {
+    uint8_t data = 10;
+    this->read_register(0x0, &data, 0x1);
+    /* ESP_LOGI(TAG, "READ value: %d", data); */
+}
+
+void ShowcaseComponent::dump_config(){
+    ESP_LOGCONFIG(TAG, "Empty I2C component");
+}
+
+}  // namespace empty_i2c_component
+}  // namespace esphome

components/showcase_component/empty_i2c_component.h

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+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/output/float_output.h"
+
+namespace esphome {
+namespace showcase_component {
+
+class ShowcaseComponent : public i2c::I2CDevice, public Component {
+ public:
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+
+  void set_upper(output::FloatOutput *upper) {upper_ = upper;}
+  void set_lower(output::FloatOutput *lower) {lower_ = lower;}
+
+  void write_state(float upper, float lower){
+    this->upper_->set_level(upper);
+    this->lower_->set_level(lower);
+  }
+
+ protected:
+  output::FloatOutput *upper_;
+  output::FloatOutput *lower_;
+};
+
+}  // namespace empty_i2c_component
+}  // namespace esphome

components/showcase_component/showcase_component.cpp

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+#include "esphome/core/log.h"
+#include "empty_i2c_component.h"
+#include <Arduino.h>
+
+namespace esphome {
+namespace empty_i2c_component {
+
+static const char *TAG = "empty_i2c_component.component";
+
+void EmptyI2CComponent::setup() {
+}
+
+void EmptyI2CComponent::loop() {
+    uint8_t data = 10;
+    this->read_register(0x0, &data, 0x1);
+    ESP_LOGI(TAG, "READ value: %d", data);
+}
+
+void EmptyI2CComponent::dump_config(){
+    ESP_LOGCONFIG(TAG, "Empty I2C component");
+}
+
+
+}  // namespace empty_i2c_component
+}  // namespace esphome

components/showcase_component/showcase_component.h

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+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/i2c/i2c.h"
+
+namespace esphome {
+namespace empty_i2c_component {
+
+class EmptyI2CComponent : public i2c::I2CDevice, public Component {
+ public:
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+};
+
+
+}  // namespace empty_i2c_component
+}  // namespace esphome