LAB LIST

1)program1: LED WITH BUZZER https://wokwi.com/projects/337602112497123922

2)program2: LED with PUSH BUTTON: https://wokwi.com/projects/334431214876230226

3)Program3:DHT 22 sensor: https://wokwi.com/projects/337603663792964179

4)Program 4: relay with arduino ie Servo motor with BUTTON: https://wokwi.com/projects/337603967810798163

5)Program 5: LCD DHT 22 https://wokwi.com/projects/337605922532622930

6)Flood Monitoring System:
#include "ThingSpeak.h"
#include <ESP8266WiFi.h>
const int trigPin1 = D1;
const int echoPin1 = D2;
#define redled D3
#define grnled D4
//#define BUZZER D5 //buzzer pin
unsigned long ch_no = 1838852;//Replace with Thingspeak Channel number
const char * write_api = "B09P3G8RR3PGTIT6";//Replace with Thingspeak write API
char auth[] = "mwa0000027193634";
char ssid[] = "m";
char pass[] = "Csdept@1234";
unsigned long startMillis;
unsigned long currentMillis;
const unsigned long period = 10000;
WiFiClient client;
long duration1;
int distance1;
void setup()
{
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
pinMode(redled, OUTPUT);
pinMode(grnled, OUTPUT);
digitalWrite(redled, LOW);
digitalWrite(grnled, LOW);
Serial.begin(115200);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("WiFi connected");
Serial.println(WiFi.localIP());
ThingSpeak.begin(client);
startMillis = millis(); //initial start time
}
void loop()
{
digitalWrite(trigPin1, LOW);
delayMicroseconds(2);
digitalWrite(trigPin1, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin1, LOW);
duration1 = pulseIn(echoPin1, HIGH);
distance1 = duration1 * 0.034 / 2;
Serial.println(distance1);
delay(1500);
if (distance1 <= 10)
{
digitalWrite(D3, HIGH);
//tone(BUZZER, 300);
digitalWrite(D4, LOW);
delay(1500);
//noTone(BUZZER);
}
else
{
digitalWrite(D4, HIGH);
digitalWrite(D3, LOW);
}
currentMillis = millis();
if (currentMillis - startMillis >= period)
{
ThingSpeak.setField(1, distance1);
ThingSpeak.writeFields(ch_no, write_api);
startMillis = currentMillis;
}
}

7)LED Chaser:
int pinsCount=6; // declaring the integer variable pinsCount
int pins[] = {D0,D1,D7,D5,D3,D2}; // declaring the array pins[]

void setup() {

for (int i=0; i<pinsCount; i=i+1){ // counting the variable i from 0 to 9
pinMode(pins[i], OUTPUT); // initialising the pin at index i of the array of pins as OUTPUT
}
}

void loop() {
for (int i=0; i<pinsCount; i=i+1){ // chasing right
digitalWrite(pins[i], HIGH); // switching the LED at index i on
delay(100); // stopping the program for 100 milliseconds
digitalWrite(pins[i], LOW); // switching the LED at index i off
}
for (int i=pinsCount-1; i>0; i=i-1){ // chasing left (except the outer leds)
digitalWrite(pins[i], HIGH); // switching the LED at index i on
delay(100); // stopping the program for 100 milliseconds
digitalWrite(pins[i], LOW); // switching the LED at index i off

}
}

8)Soil Moisture Sensor:
const int sensor_pin = A0; /* Connect Soil moisture analog sensor pin to A0 of NodeMCU /
void setup() {
Serial.begin(9600); / Define baud rate for serial communication */
}
void loop() {
float moisture_percentage;
moisture_percentage = ( 100.00 - ( (analogRead(sensor_pin)/1023.00) * 100.00 ) );
Serial.print("Soil Moisture(in Percentage) = ");
Serial.print(moisture_percentage);
Serial.println("%");
delay(1000);
}