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Monitor Temperature Humidity Using IoT Telegram Bot on ESP32
/*
Project: Monitor Temperature Humidity Using IoT Telegram Bot on ESP32
Board: ESP32 Dev Module (TTGO T-Display ESP32)
Connections:
ESP32 | DHT22
5V - VCC
GND - GND
IO27 - DAT
External libraries:
- UniversalTelegramBot by Brian Lough V1.1.0 (Manager)
- ArduinoJson by Benoit Blanchon V5.13.5 (Manager)
*/
#include <TFT_eSPI.h>
#include <SPI.h>
#include <SimpleDHT.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
// Initialize Wifi connection to the router
char ssid[] = "YourWiFiSSID"; // your network SSID (name)
char password[] = "YourWiFiPassword"; // your network key
// Initialize Telegram BOT
#define BOTtoken "YourTelegramBotToken" // your Bot Token (Get from Botfather)
WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);
TFT_eSPI tft = TFT_eSPI();
#define DHT22_PIN 27
SimpleDHT22 dht22(DHT22_PIN);
#define ADC_EN 14
#define ADC_PIN 35
#define VREF 1100
#define BUTTON1 35
#define BUTTON2 0
#define BUZZER 13
#define FF17 &FreeSans9pt7b
#define FF21 &FreeSansBold9pt7b
#define ROW1 0,16
#define ROW2 0,38
#define ROW3 0,60
#define ROW4 0,82
#define ROW5 0,104
#define ROW6 0,126
#define NOTE_C4 262
#define NOTE_D4 294
#define NOTE_G4 392
int melody1[] = {NOTE_C4, NOTE_G4};
int melody1Dur[] = {12, 8};
int melody3[] = {NOTE_D4};
int melody3Dur[] = {8};
#define playReadyMelody() playTone(melody1, melody1Dur, 2)
#define playNoteD4() playTone(melody3, melody3Dur, 1)
long previousMillis = 0;
int interval = 2000;
void setup()
{
pinMode(BUTTON1, INPUT_PULLUP);
pinMode(BUTTON2, INPUT_PULLUP);
Serial.begin(115200);
// Attempt to connect to Wifi network:
Serial.print("Connecting Wifi: ");
Serial.println(ssid);
tft.init();
tft.setRotation(1);
tft.fillScreen(TFT_BLACK);
tft.setFreeFont(FF21);
tft.setTextColor(TFT_GREEN);
tft.setCursor(ROW1);
tft.print("Initializing...");
// Set WiFi to station mode and disconnect from an AP if it was Previously
// connected
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
tft.fillScreen(TFT_BLACK);
tft.setFreeFont(FF21);
tft.setTextColor(TFT_GREEN);
tft.setCursor(ROW1);
tft.print("Telegram Bot");
tft.setTextColor(TFT_WHITE);
tft.setCursor(ROW2);
tft.print("---------------------------------------");
tft.setTextColor(TFT_BLUE);
tft.setCursor(ROW3);
tft.print("Temperature:");
tft.setCursor(ROW5);
tft.print("Humidity:");
tft.setTextColor(TFT_RED);
tft.setFreeFont(FF17);
playReadyMelody();
}
void loop()
{
if (millis() - previousMillis > interval) {
float temperature = 0;
float humidity = 0;
int err = SimpleDHTErrSuccess;
if ((err = dht22.read2(&temperature, &humidity, NULL)) != SimpleDHTErrSuccess) {
Serial.print("Read DHT22 failed, err=");
Serial.println(err);
delay(2000);
return;
}
tft.fillRect(0, 62, 240, 22, TFT_BLACK);
tft.setCursor(ROW4);
tft.print(temperature);
tft.print(" Celsius");
tft.fillRect(0, 106, 240, 22, TFT_BLACK);
tft.setCursor(ROW6);
tft.print(humidity);
tft.print(" %RH");
int newMessages = bot.getUpdates(bot.last_message_received + 1);
if (newMessages) {
playNoteD4();
String chatId = bot.messages[0].chat_id;
String message = bot.messages[0].text;
String statusText = "";
if (message == "STATUS") {
statusText = "Temperature: " + String(temperature) + " °C" +
"\nHumidity: " + String(humidity) + " %RH";
}
else if (message == "/start") {
statusText = "Welcome to Idris Bot. Reply STATUS to get temperature and humidity data. Thank you.";
}
else {
statusText = "Invalid command. Reply STATUS to get temperature and humidity data.";
}
bot.sendMessage(chatId, statusText, "");
}
previousMillis = millis();
}
}
const int FREQUENCY = 2000;
const int CHANNEL = 0;
const int RESOLUTION = 8;
void playTone(int *melody, int *melodyDur, int notesLength)
{
for (int i = 0; i < notesLength; i++) {
ledcAttachPin(BUZZER, CHANNEL);
int noteDuration = 1000 / melodyDur[i];
ledcWriteTone(CHANNEL, melody[i]);
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
ledcDetachPin(BUZZER);
ledcWrite(CHANNEL, 0);
}
}
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