Arduino Code for Level Monitoring using Buzzer

hardware/Arduino_Level_Buzzer_Code.ino

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+#define trigPin 8 //ultrasonic sensor
+#define echoPin 9
+#include <LiquidCrystal.h>
+
+LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+int BUZZER = 10 ;
+
+void setup(){
+      int duration,distance,percentage,heightTank;
+      Serial.begin (9600);
+      pinMode(trigPin,OUTPUT);
+      pinMode(echoPin,INPUT);
+      lcd.begin(16,2);
+      lcd.print("HELLO");
+        pinMode(BUZZER,OUTPUT);
+}
+
+void loop(){
+      int duration,distance,percentage,heightTank,deviation;
+      // We can change the next 2 lines.
+      // The first one is the max. level of the water.
+      // The next one is how high the sensor is above that max. level.
+      heightTank=65;
+      deviation=4;
+
+      digitalWrite(trigPin,HIGH);
+      delayMicroseconds(1000);
+      digitalWrite(trigPin,LOW);
+      duration=pulseIn(echoPin,HIGH);
+      distance=(duration/2)/29.1;
+      percentage=100-(((distance-deviation)*100)/heightTank);
+      Serial.println(distance);
+      Serial.println(percentage);
+      lcd.clear();
+      lcd.setCursor(0,0);
+      lcd.print("Current tank");
+      //lcd.print(distance);
+      //lcd.print(" cm");
+      lcd.setCursor(0,1);
+      lcd.print("level: ");
+      lcd.print(percentage);
+      lcd.print(" %");
+      delay(1000);
+
+      digitalWrite(BUZZER,HIGH);
+     static unsigned long lastBuzzer = 0;
+
+      if(percentage > 99 && lastBuzzer == 0) {
+      lastBuzzer = millis();
+}
+
+      if(percentage > 99) {
+      if(millis() - lastBuzzer < 15000L) {
+        digitalWrite(BUZZER,HIGH);
+        delay(100);
+        digitalWrite(BUZZER,LOW);
+        delay(100);
+    }
+}      else  {
+       digitalWrite(BUZZER,LOW);
+       lastBuzzer = 0;
+}
+  }

hardware/Arduino_Timer_wakeup.ino

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+/*
+To use the timer wake up with ESP8266, we need to connect the RST pin to GPIO 16 which is labeled as D0, in a NodeMCU board
+Code to be uploaded to ESP866
+ */
+
+void setup() {
+  Serial.begin(115200);
+  Serial.setTimeout(2000);
+
+  // Wait for serial to initialize.
+  while(!Serial) { }
+
+  // Deep sleep mode for 30 seconds, the ESP8266 wakes up by itself when GPIO 16 (D0 in NodeMCU board) is connected to the RESET pin, the time can be changed as required
+  Serial.println("I'm awake, but I'm going into deep sleep mode for 30 seconds");
+  ESP.deepSleep(30e6); //30e6 corresponds to 30000000 microseconds which is equal to 30 seconds.
+
+  // Deep sleep mode until RESET pin is connected to a LOW signal
+  //Serial.println("I'm awake, but I'm going into deep sleep mode until RESET pin is connected to a LOW signal");
+
+}
+
+void loop() {
+}