init

.gitignore

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

.vscode/extensions.json

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

include/README

+
+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

+
+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

+; 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:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+
+monitor_speed = 115200
+upload_port = COM4
+
+lib_deps =
+  adafruit/DHT sensor library @ ^1.4.0
+  adafruit/Adafruit Unified Sensor @ ^1.1.4
+  knolleary/PubSubClient @ ^2.8
\ No newline at end of file

src/main.cpp

+// INCLUDE
+#include <Arduino.h>
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include "DHT.h"
+
+//#include "esp_timer.h"
+//#include "esp_sleep.h"
+
+// PIN
+#define LED_PIN 2
+#define VOUT_PIN 4
+#define BUZ_PIN 21
+
+// MQTT
+const char* ssid = "BELL834";
+const char* password = "A6DA7A52DAAA";
+const char* mqtt_server = "test.mosquitto.org";                      // default test server = "test.mosquitto.org";
+
+#define PUBLISH_DELAY 100
+
+#define mqtt_port 1883
+#define MQTT_SERIAL_PUBLISH_CH "csc113/serialdata/th-wcv3"
+
+#define MQTT_SERIAL_PUBLISH_CH_TEMP_C "csc113/serialdata/th-wcv3/temp_c"
+#define MQTT_SERIAL_PUBLISH_CH_TEMP_F "csc113/serialdata/th-wcv3/temp_f"
+#define MQTT_SERIAL_PUBLISH_CH_HUMIDITY "csc113/serialdata/th-wcv3/humidity"
+
+#define MQTT_SERIAL_SUBSCRIBE_CH "csc113/serialdata/th-wcv3/switch"
+
+WiFiClient wifiClient;
+PubSubClient client(wifiClient);
+
+// MQTT_PRE_DECLARATION
+  void setup_wifi();
+  void reconnect();
+  void callback(char* topic, byte *payload, unsigned int length);
+  void publishSerialData(const char *serialData);
+  void publishSerialData(const char *serialData, const char *channel);
+// DHT
+#define DHTPIN 22     // Digital pin connected to the DHT sensor
+#define DHTTYPE DHT11
+
+DHT dht(DHTPIN, DHTTYPE);
+
+// DHT_PRE_DECLARATION
+  float measureHumidity();
+  float measureTemp();
+  void publishDHT();
+// TIMER
+#define TIMER_SECS 1                                                // s
+#define TIMER_MILLIS TIMER_SECS * 1000                              // → ms
+#define TIMER_MICROS TIMER_MILLIS * 1000                            // → µs
+
+esp_timer_handle_t esp_timer;
+
+// TIMER_PRE_DECLARATION
+  //..
+  static void timer_callback(void* arg);
+
+const esp_timer_create_args_t esp_timer_args = {
+  .callback = &timer_callback,
+  /* argument specified here will be passed to timer callback function */
+  .arg = (void*)esp_timer
+};
+
+/*************************************Main*************************************/
+
+// SETUP
+void setup() {
+  Serial.begin(115200);
+  Serial.setTimeout(500); 
+
+  pinMode(LED_PIN, OUTPUT);
+
+  //Buzzer
+  ledcSetup(0, 1024, 16);                                           //PWM setup
+  ledcAttachPin(BUZ_PIN, 0);
+
+  // mqtt 
+  setup_wifi();
+  client.setServer(mqtt_server, mqtt_port);
+  client.setCallback(callback);
+  reconnect();
+  Serial.setTimeout(5000);
+  
+  // dht
+  pinMode(VOUT_PIN,OUTPUT);
+  digitalWrite(VOUT_PIN,HIGH);
+  Serial.println("before dht begin");
+  dht.begin();
+
+  // timer
+  ESP_ERROR_CHECK(esp_timer_create(&esp_timer_args, &esp_timer));
+  ESP_ERROR_CHECK(esp_timer_start_periodic(esp_timer, TIMER_MICROS));
+}
+
+bool volatile toScan = true;
+bool volatile LED_I_O = true;
+bool volatile BUZ_I_O = true;
+
+// LOOP
+void loop() {
+  // Get from Broker
+  client.loop();
+
+  if(toScan){
+     // Reset
+    toScan = false;
+
+    // Scan + Publish
+    if(LED_I_O) digitalWrite(LED_PIN, HIGH);
+    publishDHT();
+    if(LED_I_O) digitalWrite(LED_PIN, LOW);
+
+    // Sleep
+    usleep(TIMER_MICROS * .75);
+  }
+  else{
+    
+  }
+}
+
+/*****************************Function Definitions*****************************/
+
+// TIMER
+static void timer_callback(void* arg){
+  toScan = true;
+}
+
+// MQTT
+void setup_wifi() {
+  delay(10);
+  // We start by connecting to a WiFi network
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+  WiFi.begin(ssid, password);
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  randomSeed(micros());
+  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...");
+    // Create a random client ID
+    String clientId = "ESP32Client-";
+    clientId += String(random(0xffff), HEX);
+    // Attempt to connect
+    if (client.connect(clientId.c_str()) )
+    {
+      Serial.println("connected");
+      // subscribe
+      client.subscribe(MQTT_SERIAL_SUBSCRIBE_CH);
+    } else {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
+bool testFor(const byte target[], byte *payload, unsigned int length){
+  int pos = 0;
+  for(pos = 0; pos < (length); pos++){
+    if(payload[pos] != target[pos]){
+      break;
+    }
+  }
+
+  if(pos == (length)){
+    return true;
+  }
+  return false;
+}
+
+const byte PROGMEM bLEDTrue[] = {'l', 'e', 'd', 't'};
+const byte PROGMEM bLEDFalse[] = {'l', 'e', 'd', 'f'};
+const byte PROGMEM bBUZTrue[] = {'b', 'u', 'z', 't'};
+const byte PROGMEM bBUZFalse[] = {'b', 'u', 'z', 'f'};
+
+void callback(char* topic, byte *payload, unsigned int length) {
+  Serial.println("-------new message from broker-----");
+  Serial.print("channel:");
+  Serial.println(topic);
+  Serial.print("data:");  
+  Serial.write(payload, length);
+  Serial.println();
+
+  if(testFor(bLEDTrue, payload, length)){
+    LED_I_O = true;
+  }
+  else if(testFor(bLEDFalse, payload, length)){
+    LED_I_O = false;
+  }
+
+  if(testFor(bBUZTrue, payload, length)){
+    BUZ_I_O = true;
+  }
+  else if(testFor(bBUZFalse, payload, length)){
+    BUZ_I_O = false;
+  }
+  
+}
+
+void publishSerialData(const char *serialData){
+  if (!client.connected()) {
+    reconnect();
+  }
+  Serial.println(String("publishing: ") + serialData);
+
+  client.publish(MQTT_SERIAL_PUBLISH_CH, serialData);
+}
+
+void publishSerialData(const char *serialData, const char *channel){
+  if (!client.connected()) {
+    reconnect();
+  }
+  Serial.println(String("publishing: ") + serialData);
+
+  client.publish(channel, serialData);
+}
+
+// DHT
+
+void publishDHT() {
+  float h = dht.readHumidity();
+  // Read temperature as Celsius (the default)
+  float t = dht.readTemperature();
+  // Read temperature as Fahrenheit (isFahrenheit = true)
+  float f = dht.readTemperature(true);
+
+  // Check if any reads failed and exit early (to try again).
+  if (isnan(h) || isnan(t) || isnan(f)) {
+    if(BUZ_I_O) ledcWrite(0, 207);
+    Serial.println(F("Failed to read from DHT sensor!"));
+    delay(3 * PUBLISH_DELAY);
+    if(BUZ_I_O) ledcWrite(0, 0);
+
+    return;
+  }
+  
+  publishSerialData(String(h, 2).c_str(), MQTT_SERIAL_PUBLISH_CH_HUMIDITY);
+  delay(PUBLISH_DELAY);
+  publishSerialData(String(t, 2).c_str(), MQTT_SERIAL_PUBLISH_CH_TEMP_C);
+  delay(PUBLISH_DELAY);
+  publishSerialData(String(f, 2).c_str(), MQTT_SERIAL_PUBLISH_CH_TEMP_F);
+  delay(PUBLISH_DELAY);
+}
\ No newline at end of file

test/README

+
+This directory is intended for PlatformIO Unit Testing 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/page/plus/unit-testing.html