@@ Line 62: / Line 62: @@
 === Programming ===
-Code
+Code:<syntaxhighlight lang="arduino">
+/*
+  Project: The Plant Plant - The Air Between Us
+  Intergration and Conversation between 2 isolated plant systems
+  By using Microcontroller, sensors and IoT platform (cloud)
+  --
+  Board: ESP32 Development Board
+  Component: MQ-2 Gas Sensor
+             DHT22 Temperature & Humidity Sensor
+             Alphanumerisches LCD 16x2, blau
+  --
+  Note: After the MQ-2 sensor is powered on, it needs to be preheated for
+  at least 3 minute before stable measurement readings can be obtained.
+  It is normal for the sensor to generate heat during operation due to
+  the presence of a heating wire inside.
--
+*/
+//add libraries
+#include <Arduino.h>
+#include <Adafruit_Sensor.h>     // for DHT22
+#include <DHT.h>
+#include <DHT_U.h>
+#include <WiFi.h>                // for connecting Wifi
+#include "esp_wpa2.h"            //wpa2 library for connections to Enterprise networks
+#include <ThingSpeak.h>          // for publishing Sensor Readings to Thingspeak
+#include <Wire.h>                // for getting the LCD Address
+#include <LiquidCrystal_I2C.h>   // for LCD
+/* Set up: DHT22 */
+#define DHTTYPE DHT22   // sensor version, we are using DHT22
+#define DHT22_PIN1  15  // Group01 pin GPIO15
+#define DHT22_PIN2  0   // Group02 pin GPIO0
+#define DHT22_PIN3  4   // Group03 pin GPIO4
+//Create sensors called "dht..."
+DHT_Unified dht01(DHT22_PIN1, DHTTYPE);
+DHT_Unified dht02(DHT22_PIN2, DHTTYPE);
+DHT_Unified dht03(DHT22_PIN3, DHTTYPE);
+int delayMS = 1500; // add delay after each reading
+/* Set up: MQ2 */
+// Define the pin numbers for the Gas Sensor
+#define MQ2_PIN1  34  // Group01 pin GPIO34
+#define MQ2_PIN2  35  // Group02 pin GPIO35
+#define MQ2_PIN3  32  // Group03 pin GPIO32
+/* Set up: Thingspeak */
+// due to the privacy of the account, won't show the real numbers
+unsigned long ChannelNumber1 = XXXXXXX;     //Insert Thingspeak Channe's number
+unsigned long ChannelNumber2 = XXXXXXX;     //Insert 2nd Thingspeak Channe's number
+const char *WriteAPIkey1="XXXXXXXXXXXXXXXX";   // Thingspeak Official Channel API Key
+const char *WriteAPIkey2="XXXXXXXXXXXXXXXX";   // 2nd Thingspeak Official Channel API Key
+/* Set up: Eduroam Wifi */
+WiFiClient client;
+byte mac[6];
+const char* host = "arduino.clanweb.eu";     //webserver test
+String url = "/eduroam/data.php";            //URL to target PHP file test
+#define EAP_ANONYMOUS_IDENTITY "meng-yun.tsai@uni-weimar.de" //anonymous@example.com, or you can use also nickname@example.com
+#define EAP_IDENTITY "daro6502" //nickname@example.com,at some organizations should work nickname only without realm, but it is not recommended
+#define EAP_PASSWORD "Tuniman86704_Y" //password for eduroam account
+//SSID NAME
+const char* ssid = "eduroam"; // eduroam SSID
+/* Set up: LCD */
+// set the LCD number of columns and rows
+int lcdColumns = 16;
+int lcdRows = 2;
+// set LCD address, number of columns and rows
+// if you don't know your display address, run an I2C scanner sketch
+LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);
+// set up display texts
+String messageStatic = "Our Dialogue";
+String messageScrolling;
+// A string variable used to store accumulated ASCII conversations
+String dialogue = "";
+// for counting letters from Ascii code
+int charCount = 0;
+/* Function: Scrolling Texts */
+// The function acepts the following arguments:
+// row: row number where the text will be displayed
+// message: message to scroll
+// delayTime: delay between each character shifting
+// lcdColumns: number of columns of your LCD
+void scrollingText(int row, String message, int delayTime, int lcdColumns) {
+  for (int i=0; i < lcdColumns; i++) {
+    message = " " + message;
+  }
+  message = message + " ";
+  for (int pos = 0; pos < message.length(); pos++) {
+    lcd.setCursor(0, row);
+    lcd.print(message.substring(pos, pos + lcdColumns));
+    delay(delayTime);
+  }
+}
+/* Functions: Group01 Flowers */
+void Group01(){
+  // Delay between measurements
+  delay(delayMS);
+  //Reading DHT22
+  // Get access to sensor event through custom sensor event type
+  sensors_event_t event;
+  // get temperature event (by reference, not by copy) and print its value.
+  // "event" is  - after this - filled with information from the sensor.
+  dht01.temperature().getEvent(&event);
+  if (isnan(event.temperature))
+  {
+    Serial.println(F("Error reading temperature!"));
+  }
+  else
+  {
+    Serial.print(F("G1 Temperature: "));
+    Serial.print(event.temperature);
+    Serial.println(F("°C"));
+    ThingSpeak.setField(2, event.temperature); // write to Thingspeak Channel Field 2
+  }
+  // get humidity event (by reference, not by copy) and print its value.
+  // "event" is  - after this - filled with information from the sensor.
+  dht01.humidity().getEvent(&event);
+  if (isnan(event.relative_humidity))
+  {
+    Serial.println(F("Error reading humidity!"));
+  }
+  else
+  {
+    Serial.print(F("G1 Humidity: "));
+    Serial.print(event.relative_humidity);
+    Serial.println(F("%"));
+    ThingSpeak.setField(3, event.relative_humidity); // write to Thingspeak Channel Field 3
+  }
+  //Reading MQ2
+  int mq2g1V = analogRead(MQ2_PIN1);
+  Serial.print("G1 MQ2 Analog output: ");
+  Serial.println(mq2g1V);
+  Serial.println(" ------------------ ");
+  delay(1000);
+  ThingSpeak.setField(1, mq2g1V); // write to Thingspeak Channel Field 1
+}
+/* Functions: Group02 Sundew */
+void Group02(){
+  delay(delayMS);
+  //Reading DHT22
+  sensors_event_t event;
+  dht02.temperature().getEvent(&event);
+  if (isnan(event.temperature))
+  {
+    Serial.println(F("Error reading temperature!"));
+  }
+  else
+  {
+    Serial.print(F("G2 Temperature: "));
+    Serial.print(event.temperature);
+    Serial.println(F("°C"));
+    ThingSpeak.setField(5, event.temperature); // write to Thingspeak Channel Field 5
+  }
+  dht02.humidity().getEvent(&event);
+  if (isnan(event.relative_humidity))
+  {
+    Serial.println(F("Error reading humidity!"));
+  }
+  else
+  {
+    Serial.print(F("G2 Humidity: "));
+    Serial.print(event.relative_humidity);
+    Serial.println(F("%"));
+    ThingSpeak.setField(6, event.relative_humidity); // write to Thingspeak Channel Field 6
+  }
+  //Reading MQ2
+  int mq2g2V = analogRead(MQ2_PIN2);
+  Serial.print("G2 MQ2 Analog output: ");
+  Serial.println(mq2g2V);
+  Serial.println(" ------------------ ");
+  delay(1000);
+  ThingSpeak.setField(4, mq2g2V); // write to Thingspeak Channel Field 4
+}
+/* Functions: Group03 Intergration */
+void Group03(){
+  delay(delayMS);
+  //Reading DHT22
+  sensors_event_t event;
+  dht03.temperature().getEvent(&event);
+  if (isnan(event.temperature))
+  {
+    Serial.println(F("Error reading temperature!"));
+  }
+  else
+  {
+    Serial.print(F("G3 Temperature: "));
+    Serial.print(event.temperature);
+    Serial.println(F("°C"));
+    ThingSpeak.setField(7, event.temperature); // write to Thingspeak Channel Field 7
+  }
+  dht03.humidity().getEvent(&event);
+  if (isnan(event.relative_humidity))
+  {
+    Serial.println(F("Error reading humidity!"));
+  }
+  else
+  {
+    Serial.print(F("G3 Humidity: "));
+    Serial.print(event.relative_humidity);
+    Serial.println(F("%"));
+    Serial.println(" ------------------ ");
+    ThingSpeak.setField(8, event.relative_humidity); // write to Thingspeak Channel Field 8
+  }
+}
+void Group03_MQ2(){
+  //Reading MQ2
+  int mq2g3V = analogRead(MQ2_PIN3);
+  Serial.print("G3 MQ2 Analog output: ");
+  Serial.println(mq2g3V);
+  delay(500);
+  ThingSpeak.writeField(ChannelNumber2, 1, mq2g3V, WriteAPIkey2);
+  // LCD Display
+  // convert MQ-2's value to ASCII code
+  int ascii_value = map(mq2g3V, 1000, 2500, 34, 126);
+  char ascii_char = (char)ascii_value;
+  // a new character is added to the string (the previous one is kept)
+  dialogue += ascii_char ;
+  charCount++; // a ccumulated character count +1
+  // Try using spaces to create a variation in sentence length for a more natural dialogue effect.
+  // when the accumulated character count exceeds 7, insert a space randomly
+  if (charCount > 7) {
+    // if the count exceeds 15, force to insert a space
+    if (random(0, 2) == 1 || charCount >= 15) {
+      dialogue += " ";
+      charCount = 0; // after inserting a space, reset the count
+    }
+  }
+  // if the string length exceeds the LCD display limit (32 characters)
+  if (dialogue.length() > 32) {
+    dialogue = dialogue.substring(1); // remove the oldest character
+  }
+  // print scrolling message
+  lcd.setCursor(0, 1);
+  messageScrolling = dialogue.substring(0, 16);
+  scrollingText(1, messageScrolling, 350, lcdColumns);
+}
+void setup()
+{
+  // initialize serial communication
+  Serial.begin(9600);
+  // connect or reconnect to wifi
+  WiFi.disconnect(true); //disconnect from WiFi to set new WiFi connection
+  WiFi.mode(WIFI_STA); //init wifi mode
+  // start wifi connection with eduroam
+  // WITHOUT CERTIFICATE - WORKING WITH EXCEPTION ON RADIUS SERVER
+  WiFi.begin(ssid, WPA2_AUTH_PEAP, EAP_ANONYMOUS_IDENTITY, EAP_IDENTITY, EAP_PASSWORD);
+  // check if wifi connected
+  // continue after while loop finished
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(F("."));
+    }
+    Serial.println("");
+    Serial.println(F("WiFi is connected!"));
+    Serial.println(" ");
+  // initialize DHT22
+  dht01.begin();
+  dht02.begin();
+  dht03.begin();
+  // initialize ThingSpeak
+  ThingSpeak.begin(client);
+  // initialize LCD
+  lcd.init();
+  // turn on LCD backlight
+  lcd.backlight();
+}
+void loop()
+{
+  yield(); // buffer ESP - stuff
+// LCD Display
+  lcd.clear();
+  // set cursor to position (column and row)
+  lcd.setCursor(2, 0);
+  // print static message
+  lcd.print(messageStatic);
+// Execute functions of 3 groups
+  Group03_MQ2();
+  Group03();
+  delay(delayMS);
+  Group01();
+  delay(delayMS);
+  Group02();
+  delay(delayMS);
+  // Write to ThingSpeak.
+  int x = ThingSpeak.writeFields(ChannelNumber1, WriteAPIkey1);
+  if(x == 200){
+     Serial.println("Channel update successful.");
+   }else{
+     Serial.println("Problem updating channel. HTTP error code " + String(x));
+   }
+   delay(15000);
+}
+</syntaxhighlight>
 == Winterwerkschau (Exhibition) ==

Meng-Yun Tsai (view source)

Revision as of 21:33, 30 January 2025