Circuit Diagram:

Code:

void setup(){

Serial.begin(115200);pinMode(A0, INPUT);delay(1000);

Serial.println(“AT+CWJAP=\”Simulator Wifi\ “,\”\ “\r\n”);

delay(3000);

}

void loop(){

int senseValue = analogRead(A0);

float volt = (senseValue/1020.0) * 4.9; //Volts floatfloat tempC = (volt -0.5) * 100; //CelciusSerial.println(tempC);

Serial.println(“AT+CIPSTART=\”TCP\ “,\”api.thingspeak.com\ “,80\r\n”);

delay(5000);int len = 65;

Serial.print(“AT+CIPSEND=”);Serial.println(len);

delay(10);

Serial.print(“GET /update?api_key=QIJ30DA6H5OI2DWV&field1=120 HTTP/1.1\r\n”);delay(100);

Serial.println(“AT+CIPCLOSE=0\r\n”);delay(6000);

}

Output:

Program 5.3: To interface Temperature sensor and ESP8266 with Arduino and update temperaturereading to Thingspeak.

Component:

Circuit Diagram:

Code:

void setup(){

Serial.begin(115200);pinMode(A0, INPUT);delay(1000);

Serial.println(“AT+CWJAP=\”Simulator Wifi\ “,\”\ “\r\n”);

delay(3000);

}

void loop(){

int senseValue = analogRead(A0);

float volt = (senseValue/1020.0) * 4.9; //Volts floatfloat tempC = (volt -0.5) * 100; //CelciusSerial.println(tempC);

Serial.println(“AT+CIPSTART=\”TCP\ “,\”api.thingspeak.com\ “,80\r\n”);

delay(5000);int len = 65;

Serial.print(“AT+CIPSEND= ”);Serial.println(len);

delay(10);

Serial.print(“GET /update?api_key=AT0I0YF0H855GT2U&field1= ” + String(tempC) + “HTTP/1.1\r\n”);

delay(100);Serial.println(“AT+CIPCLOSE=0\r\n”);delay(6000);

}

Output:

Program 5.4: To interface Temperature sensor and ESP8266 with Arduino and update temperature values to Thingspeak and tweet “High Temp” message on tweeter when temperature value isgreater than 40C.

Component:

Circuit Diagram:

Code:

void setup(){

Serial.begin(115200);pinMode(A0, INPUT);delay(1000);

Serial.println(“AT+CWJAP=\”Simulator Wifi\ “,\”\ “\r\n”);

delay(3000);

}

void loop(){

int senseValue = analogRead(A0);

float volt = (senseValue/1020.0) * 4.9; //Volts floatfloat tempC = (volt -0.5) * 100; //CelciusSerial.println(tempC);

Serial.println(“AT+CIPSTART=\”TCP\ “,\”api.thingspeak.com\ “,80\r\n”);

delay(5000);int len = 65;

Serial.print(“AT+CIPSEND=”); Serial.println(len);

delay(10);

Serial.print(“GET /update?api_key=AT0I0YF0H855GT2U&field1=” + String(tempC) + “HTTP/1.1\r\n”);

delay(100);Serial.println(“AT+CIPCLOSE=0\r\n”);delay(6000);

}

Steps:

1. Create new channel on ThingSpeak

2. Go to apps => react app => create new

3. Tweet Temperature channel

4. Start the simulator and increase temperature above 40

5. Channel Stats graph

6. See the Tweet

Program 5.5: To interface LDR sensor, LED and ESP8266 with Arduino and update light intensity values to Thingspeak and tweet “LIGHT ON” message on tweeter when light intensity value is less than 300.

Component:

Circuit Diagram:

Code:

int sense_value;void setup(){

Serial.begin(115200);pinMode(10, OUTPUT);pinMode(12, OUTPUT);pinMode(A1, INPUT);delay(1000);

Serial.println(“AT+CWJAP=\”Simulator Wifi\ “,\”\ “\r\n”);

delay(3000);

}

void loop(){

int sense_value = analogRead(A1);Serial.println();

if (sense_value <= 300){digitalWrite(12, HIGH);digitalWrite(10, LOW);

}

else {

digitalWrite(10, HIGH);digitalWrite(12, LOW);

}

Serial.println(“AT+CIPSTART=\”TCP\ “,\”api.thingspeak.com\ “,80\r\n”);delay(500);

int len = 65;Serial.print(“AT+CIPSEND=”);Serial.println(len);

delay(10);

Serial.print(“GET /update?api_key=T1HHE4KTNLIKELVC&field1=” + String(sense_value)+ “HTTP/1.1\r\n”);

delay(100);Serial.println(“AT+CIPCLOSE=0\r\n”);delay(600);

}

Steps:

1. Create channel for Tweet with LDR

2. Channel view

3. API view

4. React App

5. Start simulator and decrease LDR value below 300

6. Channel stats

7. Tweet: Open Tweeter account and check the message.