AnalogRead-Example.ino

int ProxSensor = A0;
int inputVal = 0;

void setup() 
{                
  pinMode(13, OUTPUT);          // Pin 13 has an LED connected on most Arduino boards:  
  pinMode(ProxSensor,INPUT);    // Pin 2 is connected to the output of proximity sensor
  Serial.begin(9600);
}

void loop() 
{
  inputVal = analogRead(ProxSensor); // Analog value will very from 0-1023
  Serial.println(inputVal);
  
  if( inputVal > 500 ){ 
    digitalWrite(13, HIGH);   // set the LED on
  }
  else{
    digitalWrite(13, LOW);    // set the LED off
  }
  delay(500);              // wait for half of a second
}

DigitalRead-Example.ino

int ProxSensor=2;
int inputVal = 0;

void setup() 
{                
  pinMode(13, OUTPUT);          // Pin 13 has an LED connected on most Arduino boards:  
  pinMode(ProxSensor,INPUT);    //Pin 2 is connected to the output of proximity sensor
  Serial.begin(9600);
}

void loop() 
{
  inputVal = digitalRead(ProxSensor);
  Serial.println(inputVal);
  
  if( inputVal == HIGH ){
    //Check the sensor output
    digitalWrite(13, HIGH);   // set the LED on
  }
  else{
    digitalWrite(13, LOW);    // set the LED off
  }
  delay(500);              // wait for half of a second
}

i2c-LCD-Example.ino

#include <Wire.h>
#include <LiquidCrystal_PCF8574.h>

// creating lcd object
LiquidCrystal_PCF8574 lcd(0x27);


void setup()
{
  // LCD Error check 
  int error;
  
  Wire.begin();
  Wire.beginTransmission(0x27);
  error = Wire.endTransmission();
  if (error == 0) {
    Serial.println(": LCD found.");
  } else {
    Serial.println(": LCD not found.");
  } 
  
  lcd.begin(16, 2); // initialize the lcd as 16 cols, 2 rows
  lcd.setBacklight(255); // Turn backLight ON
}

void loop()
{
    
    lcd.clear(); // clear the LCD
    lcd.home(); // puts cursor to 0,0  
    //  You can also use lcd.setCursor(0, 0); to put cursor at a specific position
    

    lcd.print("Hello LCD"); 
    delay(2000);
}

Thingspeak-SingleWrite.ino

#include "ThingSpeak.h"
#include <ESP8266WiFi.h>
int keyIndex = 0;            
WiFiClient  client;

char ssid[] = "Your SSID Here";
char pass[] = "Your Password Here";   
unsigned long myChannelNumber = 123456;
const char * myWriteAPIKey = "XXXXXXXXXXX";

long int calculate( long int data){
  
  /* Wait for 5 seconds before calculating new data */
  delay( 5000 );
 
  /* Start Writing code from here, 
   * make sure whatever value you want to upload,
   * must be assigned to variable 'data'
   */
  data = analogRead( 0 );
  





 
 /*returned 'data' will be uploiaded to the Thingspeak channel */
  return data; 
 }


int number = 0;

void setup() {
  Serial.begin(115200);  // Initialize serial
 
  WiFi.mode(WIFI_STA); 
  ThingSpeak.begin(client);  // Initialize ThingSpeak
  
  // Connect or reconnect to WiFi
  if(WiFi.status() != WL_CONNECTED){
    Serial.println("Attempting to connect to SSID: "+ String(ssid) );
    while(WiFi.status() != WL_CONNECTED){
      // Connect to WIFI (WPA/WPA2 network 
      WiFi.begin(ssid, pass);  
      Serial.print(".");
      delay(3000);     
    } 
    Serial.println("\nConnected.");
  }

}

long int data = 0;
void loop() {
  
  /* Write data to ThingSpeak. There are up to 8 fields in a channel, 
   * allowing you to store up to 8 different pieces of information in a channel.  
   * Here, we write to field 1
   */
   
  data = calculate( data );
  
  int field = 1;
  int responseCode = ThingSpeak.writeField(myChannelNumber, field , data , myWriteAPIKey);
  if ( responseCode == 200 ){
    Serial.println("Channel update successful.");
  }
  else {
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
}

Ultrasonic-Read.ino

int trigPin = 9;
int echoPin = 10;

// defines variables
long duration;
int distance;

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  Serial.begin(9600); // Starts the serial communication
}

void loop() {  
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  distance= duration*0.034/2; // Calculating the distance

  // Prints the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.println(distance);
  
  // Wait for 300ms   
  delay(300);
}