first empty components

custom_components/example_custom_sensor/example_custom_sensor.cpp

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+#include "esphome.h"
+#include "example_custom_sensor.h"
+
+namespace esphome {
+namespace example_custom_sensor {
+
+void ExampleCustomSensor::setup() {
+  // This will be called by App.setup()
+}
+
+void ExampleCustomSensor::loop() {
+  // This will be called by App.loop()
+}
+
+void ExampleCustomSensor::update(){
+  // This will be called every "update_interval" milliseconds.
+}
+
+void ExampleCustomSensor::dump_config(){
+
+}
+
+} //namespace example_custom_sensor
+} //namespace esphome

custom_components/example_custom_sensor/example_custom_sensor.h

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+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+
+namespace esphome {
+namespace example_custom_sensor {
+
+class ExampleCustomSensor : public sensor::Sensor, public PollingComponent {
+    void setup() override;
+    void dump_config() override;
+    void loop() override;
+    void update() override;
+};
+
+} //namespace example_custom_sensor
+} //namespace esphome

custom_components/example_custom_sensor/sensor.py

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+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import sensor
+from esphome.const import CONF_ID
+
+example_custom_sensor_ns = cg.esphome_ns.namespace('example_custom_sensor')
+
+ExampleCustomSensor = example_custom_sensor_ns.class_('ExampleCustomSensor', cg.PollingComponent)
+
+CONFIG_SCHEMA = cv.Schema({
+    cv.GenerateID(): cv.declare_id(ExampleCustomSensor)
+}).extend(cv.polling_component_schema('60s'))
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+