button_light_buzz.ino

#include <WiFi.h>
#include <WiFiMulti.h>

#define SEC 100

// Button with LED indicator and buzzer

WiFiMulti WiFiMulti;

WiFiClient client;

const int buttonPin = 2;
const int ledPin =  25;
const int buzzerPin = 14;

hw_timer_t * timer = NULL;
volatile unsigned int timer_counter = 0;
void IRAM_ATTR onTimer() {
  // 100 Hz
  ++timer_counter;
}

unsigned light_off_time = 0, buzz_off_time = 0;
void buzzOn(uint16_t time) {
  buzz_off_time = timer_counter + 2*SEC;
  Serial.println("Buzzzzzzz " + String(time));
  digitalWrite(buzzerPin, HIGH);
}

void lightOn(uint16_t time) {
  light_off_time = timer_counter + 1*SEC;
  Serial.println("Light " + String(time));
  digitalWrite(ledPin, HIGH);
}

void work() {
  Serial.println("timer " + String(timer_counter));
  Serial.println("ligh off " + String(light_off_time));
  Serial.println("buzz off " + String(buzz_off_time));
  
  if (light_off_time <= timer_counter) {
    digitalWrite(ledPin, LOW);
  }
  if (buzz_off_time <= timer_counter) {
    digitalWrite(buzzerPin, LOW);
  }
}

volatile bool button_pressed = false;
void IRAM_ATTR handleInterrupt() {
  button_pressed = true;
}

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
  
  attachInterrupt(digitalPinToInterrupt(buttonPin), handleInterrupt, FALLING);
  
  Serial.begin(9600);

  timer = timerBegin(0, 80, true);
  timerAttachInterrupt(timer, &onTimer, true);
  timerAlarmWrite(timer, 10000, true);
  timerAlarmEnable(timer);
  
  setupWifiConnection();
  setupServerConnection();
}


void loop() {
  if(WiFi.status()== WL_CONNECTED){   //Check WiFi connection status
   if(client.available() || client.connected()) {
     String line = client.readStringUntil('\n');
     if (String("Buzz").equalsIgnoreCase(line)) {
       buzzOn(2000); // buzz for 1 sec
     }
     if (String("Light").equalsIgnoreCase(line)) {
       lightOn(1000); // turn on the light for 1 sec
     }
   } else {
     if(client.connected()) Serial.println("client connected");
     if(client.available()) Serial.println("client available:" + String(client.available()));
//     delay(60000);
   }
 } else{
   Serial.println("Error in WiFi connection");
 }

  if(button_pressed) {
    Serial.println("Pushed!");
    sendSendMessageToServer("Push");
    button_pressed = false;
  }

  work();
  delay(500);
}

void setupWifiConnection() {
  WiFiMulti.addAP("TooplooxNet", "dupadupa..");

  Serial.println();
  Serial.println();
  Serial.print("Wait for WiFi... ");

  while(WiFiMulti.run() != WL_CONNECTED) {
      Serial.print(".");
      delay(500);
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void setupServerConnection() {
  const uint16_t port = 21107;
  const char * host = "172.30.1.76";
  Serial.print("connecting to ");
  Serial.println(host);

  if (!client.connect(host, port)) {
      Serial.println("connection failed");
      return;
  } else {
    Serial.println("client connection success");
    client.print("Hello Button\n");
    client.setTimeout(100);
  }
}

void sendSendMessageToServer(String message) {
  if(WiFi.status()== WL_CONNECTED){   //Check WiFi connection status
   if(client.available() || client.connected()) {
     client.print(message + "\n");
   }
   else {
     if(client.connected()) Serial.println("client connected");
     if(client.available()) Serial.println("client available:" + String(client.available()));
     delay(60000);
   }
  } else{
   Serial.println("Error in WiFi connection");  
   delay(30000);  //Retry every 30 seconds 
 }
}