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‎.gitignore

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.pio
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.vscode/.browse.c_cpp.db*
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.vscode/c_cpp_properties.json
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.vscode/launch.json
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.vscode/ipch

‎.vscode/extensions.json

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

‎include/README

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

‎lib/README

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

‎platformio.ini

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; PlatformIO Project Configuration File
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;
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; Build options: build flags, source filter
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; Upload options: custom upload port, speed and extra flags
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; Library options: dependencies, extra library storages
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; Advanced options: extra scripting
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;
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; Please visit documentation for the other options and examples
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; https://docs.platformio.org/page/projectconf.html
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[env:esp32dev]
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platform = espressif32
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board = esp32dev
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framework = arduino
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lib_deps =
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wifwaf/MH-Z19@^1.5.4
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bblanchon/ArduinoJson@^7.0.4
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monitor_speed = 9600

‎src/main.cpp

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#include <Arduino.h>
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#include "MHZ19.h"
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#include <HardwareSerial.h>
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#include <WiFi.h>
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#include <ArduinoJson.h>
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#include <HTTPClient.h>
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#include <esp_wifi.h>
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#include <vector>
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#define BAUDRATE 9600 // Device to MH-Z19 Serial baudrate (should not be changed)
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const char* ssid = "Wifi SSID"; // WiFi SSID
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const char* password = "WIFI PASSWORD"; // WiFi Password
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const char* api_url = "https://backend.thinger.io/v3/users/..."; // Thinger.io host
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const String token = "Bearer ABCABCABC";
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MHZ19 myMHZ19; // Constructor for library
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HardwareSerial mySerial(2);
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WiFiClientSecure client;
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std::vector<String> offlineData;
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unsigned long getDataTimer = 0;
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void setup()
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{
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Serial.begin(9600); // Device to serial monitor feedback
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mySerial.begin(BAUDRATE);
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myMHZ19.begin(mySerial); // *Serial(Stream) refence must be passed to library begin().
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myMHZ19.autoCalibration(); // Turn auto calibration ON (OFF autoCalibration(false))
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WiFi.mode(WIFI_STA);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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Serial.print('.');
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delay(1000);
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}
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Serial.println(WiFi.localIP());
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client.setInsecure();
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}
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void sendData(String data) {
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HTTPClient http;
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http.begin(client, api_url);
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http.addHeader("Content-Type", "application/json;charset=UTF-8");
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http.addHeader("Authorization", token);
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int httpCode = http.POST(data);
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if (httpCode != 200 && httpCode > 0 ) {
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String payload = http.getString();
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Serial.println(httpCode);
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Serial.println(payload);
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}
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else {
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Serial.println(http.errorToString(httpCode).c_str());
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}
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http.end();
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}
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void loop()
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{
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if (millis() - getDataTimer >= 61000)
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{
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JsonDocument doc;
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String data;
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doc["co2"] = myMHZ19.getCO2();
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doc["temperature"] = (int)myMHZ19.getTemperature();
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doc["startup_time"] = millis() / 1000;
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serializeJson(doc, data);
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if (WiFi.status() == WL_CONNECTED)
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{
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// if (offlineData.size() > 0) {
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// for (auto& d : offlineData) {
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// sleep(0.1);
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// sendData(d);
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// }
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// offlineData.clear();
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// }
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// Send the current data
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sendData(data);
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} else {
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// If WiFi is not connected, store the data for later
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// if (offlineData.size() > 800) {
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// offlineData.erase(offlineData.begin());
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// }
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offlineData.push_back(data);
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WiFi.begin(ssid, password);
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}
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}
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}

‎test/README

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

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