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Sketch.ino
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Sketch.ino
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#include <ESP32Servo.h>
#include <LiquidCrystal.h>
#include <Adafruit_NeoPixel.h>
#include <WiFi.h>
#include <PubSubClient.h>
#include <HTTPClient.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
//***Set server***
const char* mqttServer = "broker.hivemq.com";
int port = 1883;
WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);
void wifiConnect() {
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" Connected!");
}
void mqttConnect() {
while(!mqttClient.connected()) {
Serial.println("Attemping MQTT connection...");
String clientId = "ESP32Client-";
clientId += String(random(0xffff), HEX);
if(mqttClient.connect(clientId.c_str())) {
Serial.println("connected");
}
else {
Serial.println("try again in 5 seconds");
delay(5000);
}
}
}
// Function to publish data to MQTT topics
void publishData(float temperature, float pH, float distance, float waterLevel) {
mqttClient.publish("ESP32Client-/temperature", String(temperature).c_str());
mqttClient.publish("ESP32Client-/pH", String(pH).c_str());
mqttClient.publish("ESP32Client-/distance", String(distance).c_str());
mqttClient.publish("ESP32Client-/water_level", String(waterLevel).c_str());
if ((temperature < 20 || temperature > 30) ) {
mqttClient.publish("ESP32Client-/AlertTemperature", "Alert! : the temperature must be between 20 and 28 Celsius");
}
if ( (distance < 200)) {
mqttClient.publish("ESP32Client-/AlertDistance", "Alert! the distance must be greater than 200 cm");
}
}
//callback: appelée lorsqu'un message MQTT est reçu.
//Elle affiche le sujet du message et le contenu du message dans la console.
void callback(char* topic, byte* message, unsigned int length) {
Serial.println(topic);
String strMsg;
for(int i=0; i<length; i++) {
strMsg += (char)message[i];
}
Serial.println(strMsg);
}
int tempPin = 32;
int phPin = 34;
int waterLevelPin = 35;
int trigUltraPin = 23;
int echoUltraPin = 22;
int fishFeederPin = 33;
int turnOnFishFeederBtnPin = 16;
int buzzerPin = 4;
int turnOnFanPin = 15;
Servo fishFeeder; //servomoteur
LiquidCrystal lcd(13, 12, 14, 27, 26, 25); //lcd
//Led
int LED_COUNT = 16;
int LED_PIN = 19;
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(LED_COUNT, LED_PIN, NEO_GRB+NEO_KHZ800);
// pixels:bande de LEDs NeoPixel pour afficher des effets lumineux rouge
//si la valeur du niveau d'eau ou de la temprature sont anormales
//utilise un capteur à ultrasons placé au fond de l'aquarium pour mesurer la distance
//à la surface de l'eau
long getDistance() {
//distance par rapport à un obstacle (changement de milieu)
digitalWrite(trigUltraPin, LOW);
delayMicroseconds(2);
digitalWrite(trigUltraPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigUltraPin, LOW);
long duration = pulseIn(echoUltraPin, HIGH);
long disanceCm = duration * 0.034 / 2;
//distance = vitesse son dans l'eau * durée allez retour / 2
return disanceCm;
}
void setup() {
pinMode(tempPin, INPUT);
pinMode(phPin, INPUT);
pinMode(turnOnFanPin, OUTPUT);
pinMode(trigUltraPin, OUTPUT);
pinMode(echoUltraPin, INPUT);
pinMode(waterLevelPin, INPUT);
pinMode(buzzerPin, OUTPUT);
pinMode(turnOnFishFeederBtnPin, INPUT);
Serial.begin(115200);
Serial.begin(9600);
fishFeeder.attach(fishFeederPin);
fishFeeder.write(0);
lcd.begin(16, 2);
pixels.begin(); // INITIALIZE NeoPixel pixels object (REQUIRED)
pixels.show(); // Turn OFF all pixels ASAP
pixels.setBrightness(200);
//Connect to Wifi
Serial.print("Connecting to WiFi");
wifiConnect();
mqttClient.setServer(mqttServer, port);
mqttClient.setCallback(callback);
mqttClient.setKeepAlive( 90 );
mqttConnect();
}
//effectue un balayage de couleur sur la bande de LEDs NeoPixel
void colorWipe(uint32_t color, int wait) {
for(int i = 0; i < pixels.numPixels(); i++) {
pixels.setPixelColor(i, color);
pixels.show();
delay(wait);
}
}
void turnOnLed() {
}
void turnOffLed() {
//pixels.clear();
//pixels.show();
}
//ventilateur
void turnOnFan() {
digitalWrite(turnOnFanPin, HIGH);
}
void turnOffFan() {
digitalWrite(turnOnFanPin, LOW);
}
float readTemperature() {
const float VCC = 3.3; // NodeMCU on board 3.3v vcc
const float R2 = 10000; // 10k ohm series resistor
const float adc_resolution = 4096; // 12-bit adc
const float A = 0.001129148; // thermistor equation parameters
const float B = 0.000234125;
const float C = 0.0000000876741;
float Vout, Rth, temperature, adc_value;
adc_value = adc_resolution-analogRead(tempPin)+0.5; // switch direction
Vout = (adc_value * VCC) / adc_resolution;
Rth = (VCC * R2 / Vout) - R2; // Formula for R2 as Pull-down: Vcc-Rth-R2-GND
temperature = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3)))); // Temperature in kelvin
temperature = temperature - 273.15; // Temperature in degree celsius
Serial.print(" Temperature = ");
Serial.print(temperature);
Serial.println(" degree celsius");
return temperature;
}
void loop() {
// Read temperature
float celcius = readTemperature();
lcd.print("Temperature: ");
lcd.print(celcius);
delay (1000);
lcd.setCursor(0, 1);
// Read distance
float distanceCm = getDistance();
lcd.print("Distance: ");
lcd.print(distanceCm);
delay (1000);
// Check temperature conditions for the buzzer alert
if ((celcius < 20 || celcius > 30) ) {
// Turn on the buzzer for 1 second
tone(buzzerPin, 300, 1000);
Serial.println("Buzzer alert! : the temperature must be between 20 and 28 Celsius");
colorWipe(pixels.Color(255, 0, 0), 50); // Red
}
else
// Check distance conditions for the buzzer alert
if ( (distanceCm < 200)) {
// Turn on the buzzer for 1 second
tone(buzzerPin, 300, 1000);
Serial.println("Buzzer alert! the distance must be greater than 200 cm");
colorWipe(pixels.Color(255, 0, 0), 50); // Red
}
else {
colorWipe(pixels.Color(0, 255, 0), 50); }// Green
fishFeeder.write(90);
delay(1000);
fishFeeder.write(0);
if (digitalRead(turnOnFishFeederBtnPin) == LOW) {
fishFeeder.write(150);} // Operate the fish feeder
if ((celcius > 30))
{ turnOnFan();}
else if ((celcius = 20))
{turnOffFan();}
lcd.clear();
delay (500);
// Read pH value
float pH = analogRead(phPin);
lcd.setCursor(0, 0);
lcd.print("PH: ");
lcd.print(pH);
delay(1000);
float waterLevel = analogRead(waterLevelPin);
lcd.setCursor(0, 1);
lcd.print("Water: ");
lcd.print(waterLevel);
delay(1000);
lcd.clear();
delay(500);
//Turn off Led
turnOffLed();
// Turn off Fan
if (celcius > 28)
turnOnFan();
delay(1000);
// Publish data to MQTT topics
mqttClient.loop();
if (mqttClient.connected()) {
Serial.print("connected to mqtt");
publishData(celcius, pH, distanceCm, waterLevel);
}
}