Code added

.gitignore

@@ -4,6 +4,19 @@ logs
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+firebase-debug.log*
+firebase-debug.*.log*
+
+# Firebase cache
+.firebase/
+.firebaserc
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
 
 # Runtime data
 pids
@@ -56,4 +69,30 @@ typings/
 
 # dotenv environment variables file
 .env
-
+secrets.h
+config.js
+
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+/.vscode
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

HW/dht11/.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

HW/dht11/.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

HW/dht11/include/README

@@ -0,0 +1,39 @@
+
+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

HW/dht11/lib/README

@@ -0,0 +1,46 @@
+
+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

HW/dht11/platformio.ini

@@ -0,0 +1,25 @@
+; 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:esp12e]
+platform = espressif8266
+board = esp12e
+framework = arduino
+upload_speed = 921600
+monitor_speed = 115200
+
+lib_deps =
+  # RECOMMENDED
+  # Accept new functionality in a backwards compatible manner and patches
+  adafruit/DHT sensor library @ ^1.4.0
+  arduino-libraries/NTPClient @ ^3.1.0
+  bblanchon/ArduinoJson
+  ; FirebaseArduino=https://github.com/FirebaseExtended/firebase-arduino/archive/v0.3.zip
+  FirebaseArduino

HW/dht11/src/main.cpp

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+#include <Arduino.h>
+#include <ArduinoJson.h>
+#include <Adafruit_Sensor.h>
+#include <DHT.h>
+
+#include <NTPClient.h>
+#include <FirebaseArduino.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <WiFiUdp.h>
+
+
+#include "secrets.h"
+
+const String SENSOR_ID = "hermes001";
+
+WiFiUDP ntpUDP;   // UDP client
+NTPClient timeClient(ntpUDP); // NTP client
+
+// #define DONT_HAVE_SENSORS
+
+// Feather ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
+// Pin 15 can work but DHT must be disconnected during program upload.
+#define DHTPIN D3    // Digital pin connected to the DHT sensor
+
+// Uncomment whatever type you're using!
+#define DHTTYPE DHT11   // DHT 11
+//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
+//#define DHTTYPE DHT21   // DHT 21 (AM2301)
+
+#define BAUDRATE	115200
+
+struct readings {
+  bool gas;
+  float hum;  				// Humidity in Percent	  ( %)
+  float temp;  				// Temperature in Celsius (°C)
+} readings;
+
+
+// Connect pin 1 (on the left) of the sensor to +5V
+// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
+// to 3.3V instead of 5V!
+// Connect pin 2 of the sensor to whatever your DHTPIN is
+// Connect pin 4 (on the right) of the sensor to GROUND
+// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
+
+// Initialize DHT sensor.
+// Note that older versions of this library took an optional third parameter to
+// tweak the timings for faster processors.  This parameter is no longer needed
+// as the current DHT reading algorithm adjusts itself to work on faster procs.
+DHT dht(DHTPIN, DHTTYPE);
+
+// will store last time data was sent to Firebase
+unsigned long previousMillis = 0;
+const long INTERVAL = 30000;
+long unsigned int timestamp = 0;
+
+// Defs.
+void connectToWiFi(char const *ssid, char const *password);
+void readSensors(struct readings *r);
+void displaySensors(struct readings r);
+void sendDataToFirebase(struct readings r);
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
+  Serial.begin(BAUDRATE);
+  connectToWiFi(SSID, PASSWORD);
+
+  timeClient.begin(); // init NTP
+  timeClient.setTimeOffset(0); // 0= GMT, 3600 = GMT+1
+
+  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
+  dht.begin();
+
+}
+
+void loop() {
+  // check to see if it's time to send data to Firebase; that is, if the difference
+  // between the current time and last time we sent data is bigger than
+  // the interval at which we want to send data.
+  unsigned long currentMillis = millis();
+
+  if (currentMillis - previousMillis >= INTERVAL) {
+    // save the last time we sent data to Fireabase
+    previousMillis = currentMillis;
+    readSensors(&readings);
+    displaySensors(readings);
+    sendDataToFirebase(readings);
+  }
+}
+
+void connectToWiFi(char const *ssid, char const *password) {
+
+  delay(10);
+  // We start by connecting to a WiFi network
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+
+  /* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
+  would try to act as both a client and an access-point and could cause
+  network-issues with your other WiFi-devices on your WiFi-network. */
+  WiFi.mode(WIFI_STA);
+  WiFi.disconnect();
+
+ //start connecting to WiFi
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  // timestamp
+  while(!timeClient.update()) {
+    timeClient.forceUpdate();
+  }
+  // get Epoch time
+  Serial.print("> NTP Time:");
+  Serial.println(timeClient.getFormattedTime());
+  timestamp = timeClient.getEpochTime();
+
+  randomSeed(micros());
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void readSensors(struct readings *r) {
+  #ifdef DONT_HAVE_SENSORS
+    readings.gas = !readings.gas;
+    readings.temp = random(0, 80);
+    readings.hum = random(0, 80);
+  #else
+    // Read Gas status
+    r->gas = true;
+    // Reading temperature or humidity takes about 250 milliseconds!
+    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
+    r->hum = dht.readHumidity();
+    // Read temperature as Celsius (the default)
+    r->temp = dht.readTemperature();
+    // Check if any reads failed and exit early (to try again).
+    if (isnan(r->hum) || isnan(r->temp)) {
+      Serial.println(F("Failed to read from DHT sensor!"));
+      return;
+    }
+  #endif
+}
+
+void displaySensors(struct readings r) {
+  if (r.gas == true) {
+    Serial.println("[INFO] Gas DETECTED!!!");
+  }
+  Serial.print("[INFO] Gas status: ");
+  Serial.println(r.gas);
+  Serial.print("[INFO] Humidity: ");
+  Serial.print(r.hum);
+  Serial.println("%");
+  Serial.print("[INFO] Temperature: ");
+  Serial.print(r.temp);
+  Serial.print("°C ");
+  Serial.println();
+
+}
+
+void sendDataToFirebase(struct readings r) {
+  timeClient.update();
+  timestamp = timeClient.getEpochTime();
+
+  const size_t capacity = JSON_OBJECT_SIZE(4);
+  DynamicJsonBuffer jsonBuffer(capacity);
+  JsonObject& object1 = jsonBuffer.createObject();
+
+  object1["timestamp"] = timestamp;
+  object1["temp"] = r.temp;
+  object1["hum"] = r.hum;
+  object1["gas"] = r.gas;
+
+  Serial.print("Data:");
+  object1.printTo(Serial);
+  Serial.println();
+
+  String requestStatusID = Firebase.push(SENSOR_ID, object1);
+  if (Firebase.failed()) {
+    Serial.println("[ERROR] pushing data failed:");
+    Serial.println(Firebase.error());
+    return;
+  }
+
+  // String humValueID = Firebase.pushFloat(SENSOR_ID + String("/json"), r.temp);
+  // if (Firebase.failed()) {
+  //   Serial.print("[ERROR] pushing /json failed:");
+  //   Serial.println(Firebase.error());
+  //   return;
+  // }
+  // String tempValueID = Firebase.pushFloat(SENSOR_ID + String("/dht11/temperature"), r.temp);
+  // if (Firebase.failed()) {
+  //   Serial.print("[ERROR] pushing /dht11/temperature failed:");
+  //   Serial.println(Firebase.error());
+  //   return;
+  // }
+}