init project

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+
+src/config.h

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:d1_mini_pro]
+platform = espressif8266
+board = d1_mini_pro
+framework = arduino
+lib_deps = 
+	adafruit/DHT sensor library@^1.4.3
+	jfturcot/SimpleTimer@0.0.0-alpha+sha.b30890b8f7
+	adafruit/Adafruit Unified Sensor@^1.1.5
+	knolleary/PubSubClient@^2.8
+monitor_speed = 115200

src/config.h.tmpl

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+// Настройки WiFi
+#define WIFI_SSID "SSID_HERE"
+#define WIFI_PASS "PASS_HERE"
+
+// Сервер MQTT
+#define MQTT_SERVER "MQTT_SERVER_HERE"
+#define MQTT_PORT 5319
+#define MQTT_LOGIN "MQTT_LOGIN_HERE"
+#define MQTT_PASS "MQTT_PASS_HERE"
+
+#define DHTPIN D4     // pin gpio 2 in sensor
+#define DHTTYPE DHT22 // DHT 22 Change this if you have a DHT11
+
+#define CLIENT_ID "CLIENT_ID_HERE"
+#define HUMIDITY_TOPIC "sensor/humidity"
+#define TEMPERATURE_TOPIC "sensor/temperature"

src/main.cpp

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+#include <Arduino.h>
+#include <DHT.h>
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+#include <config.h>
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+DHT dht(DHTPIN, DHTTYPE);
+
+void setup_wifi() {
+  delay(10);
+  // We start by connecting to a WiFi network
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(WIFI_SSID);
+
+  WiFi.begin(WIFI_SSID, WIFI_PASS);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void reconnect() {
+  // Loop until we're reconnected
+  while (!client.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    // Attempt to connect
+    // If you do not want to use a username and password, change next line to
+    // if (client.connect("ESP8266Client")) {
+    if (client.connect("ESP8266Client", MQTT_LOGIN, MQTT_PASS)) {
+      Serial.println("connected");
+    } else {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+bool checkBound(float newValue, float prevValue, float maxDiff) {
+  return !isnan(newValue) &&
+         (newValue < prevValue - maxDiff || newValue > prevValue + maxDiff);
+}
+
+long lastMsg = 0;
+float temp = 0.0;
+float hum = 0.0;
+float diff = 1.0;
+
+void setup() {
+  Serial.begin(115200);
+  setup_wifi();
+  client.setServer(MQTT_SERVER, MQTT_PORT);
+
+  dht.begin();
+}
+
+void loop() {
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
+
+  long now = millis();
+  if (now - lastMsg > 10000) {
+    lastMsg = now;
+
+    float newTemp = dht.readTemperature();
+    float newHum = dht.readHumidity();
+
+    if (checkBound(newTemp, temp, diff)) {
+      temp = newTemp;
+      Serial.print("New temperature:");
+      Serial.println(String(temp).c_str());
+      client.publish(TEMPERATURE_TOPIC, String(temp).c_str(), true);
+    }
+
+    if (checkBound(newHum, hum, diff)) {
+      hum = newHum;
+      Serial.print("New humidity:");
+      Serial.println(String(hum).c_str());
+      client.publish(HUMIDITY_TOPIC, String(hum).c_str(), true);
+    }
+  }
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html