#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include <NewPing.h>
#include <LiquidCrystal_I2C.h>
#define TRIG_PIN 13
#define ECHO_PIN 14
#define MAX_DIST 412
#define ssid "Wokwi-GUEST"
#define pass ""
#define server "mqtt-dashboard.com"
#define port 1883
WiFiClient client;
LiquidCrystal_I2C lcd(0x27, 16, 2);
NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DIST);
Adafruit_MQTT_Client mqtt(&client, server, port);
Adafruit_MQTT_Publish level = Adafruit_MQTT_Publish(&mqtt, "level");
int sa = 0;
int counter = 0;
void MQTT_connect() {
int8_t ret;
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
while ((ret = mqtt.connect()) != 0) {
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 5 seconds...");
mqtt.disconnect();
delay(5000);
retries--;
if (retries == 0) {
while (1);
}
}
Serial.println("MQTT Connected!");
}
void setup() {
Serial.begin(115200);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
if (counter > 10) {
ESP.restart();
}
counter++;
}
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
lcd.init();
lcd.backlight();
}
void loop() {
MQTT_connect();
mqtt.processPackets(5000);
if (! mqtt.ping()) {
mqtt.disconnect();
}
int a = 412 - sonar.ping_cm();
if (a != sa) {
String b = "{\"level\":" + String(a) + "}";
level.publish(b.c_str());
Serial.print("level: ");
Serial.print(a);
Serial.println(" cm");
lcd.setCursor(0, 0);
lcd.print("level: ");
lcd.setCursor(7, 0);
if (a < 10) lcd.print(" ");
if (a < 100) lcd.print(" ");
lcd.print(a);
lcd.setCursor(11, 0);
lcd.println("cm");
} sa = a;
}