have fun

custom_components/heapmon/README.md

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+# heap space monitor
+
+A sensor to show the available heap space.
+
+Example:
+```yaml
+sensor:
+  - platform: heapmon
+    id: heapspace
+    name: "Free Space"
+```
+

custom_components/heapmon/heapmon.cpp

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+#include "heapmon.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace debug {
+
+static const char *TAG = "heapmon";
+
+void HeapMonitor::update() {
+  uint32_t free_heap = ESP.getFreeHeap();
+  ESP_LOGD(TAG, "Free Heap Size: %u bytes", free_heap);
+  this->publish_state(free_heap);
+}
+
+}  // namespace debug
+}  // namespace esphome
+

custom_components/heapmon/heapmon.h

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+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+
+namespace esphome {
+namespace debug {
+
+class HeapMonitor : public sensor::Sensor, public PollingComponent {
+ public:
+  void update() override;
+  float get_setup_priority() const override { return setup_priority::LATE; };
+};
+
+}  // namespace debug
+}  // namespace esphome
+

custom_components/heapmon/sensor.py

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+import esphome.config_validation as cv
+import esphome.codegen as cg
+from esphome.components import sensor
+from esphome.const import CONF_ID, ICON_GAUGE
+
+UNIT_BYTE = "B"
+
+debug_ns = cg.esphome_ns.namespace('debug')
+HeapMonitor = debug_ns.class_('HeapMonitor', cg.PollingComponent)
+CONFIG_SCHEMA = sensor.sensor_schema(UNIT_BYTE, ICON_GAUGE, 0).extend({
+    cv.GenerateID(): cv.declare_id(HeapMonitor),
+}).extend(cv.polling_component_schema('60s'))
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield sensor.register_sensor(var, config)
+