/*

    This sketch establishes a TCP connection to a "quote of the day" service.

    It sends a "hello" message, and then prints received data.

*/

#include

#ifndef STASSID

#define STASSID "KOSES04F"

#define STAPSK "koses04f"

#endif

const char* ssid = STASSID;

const char* password = STAPSK;

const char* host = "api.thingspeak.com";

const char* APIKey = "J9O6E7IXXXXXXX";

const uint16_t port = 80;               //const uint16_t port = 17;

int sensorPin = A0;     // select the input pin for the Vaccum Sensor

int sensorValue = 0;    // variable to store the value coming from the sensor

float vaccum = 0;       // Convertr raw data to KPa

WiFiMulti multi;

void setup()

{

    // declare the ledPin as an OUTPUT:

    pinMode(LED_BUILTIN, OUTPUT);

    Serial.begin(115200);

    delay(10);

    // We start by connecting to a WiFi network

    Serial.println();

    Serial.println();

    Serial.print("Connecting to ");

    Serial.println(ssid);

    multi.addAP(ssid, password);

    if (multi.run() != WL_CONNECTED)

    {

        Serial.println("Unable to connect to network, rebooting in 10 seconds...");

        delay(10000);

        rp2040.reboot();

    }

    Serial.println("");

    Serial.println("WiFi connected");

    Serial.println("IP address: ");

    Serial.println(WiFi.localIP());

}

void loop()

{

    static bool wait = false;

    // read the value from the sensor:

    sensorValue = analogRead(sensorPin);   

    vaccum = (sensorValue / 10.23);

    Serial.print("Raw data:");

    Serial.println(sensorValue);

    Serial.print("Vaccum:");

    Serial.println(vaccum);

   // turn the ledPin on

   if((sensorValue)<500)

      digitalWrite(LED_BUILTIN, HIGH);

   else

      digitalWrite(LED_BUILTIN, LOW);

    Serial.print("connecting to ");

    Serial.print(host);

    Serial.print(':');

    Serial.println(port);

    // Use WiFiClient class to create TCP connections

    WiFiClient client;

    if (!client.connect(host, port))

    {

        Serial.println("connection failed");

        delay(5000);

        return;

    }

    // We now create a URI for the request

    String url = "/update";

    url += "?api_key=";

    url += APIKey;

    url += "&field1=";

    url += vaccum;

    Serial.print("Requesting URL: ");

    Serial.println(url);

    // This will send a string to the server

    Serial.println("sending data to server");

    if (client.connected())

    {

//    client.println("hello from ESP8266");

        client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n");

    }

    // wait for data to be available

    unsigned long timeout = millis();

    while (client.available() == 0)

    {

        if (millis() - timeout > 5000)

        {

            Serial.println(">>> Client Timeout !");

            client.stop();

//            delay(60000);

            delay(5000);

            return;

        }       

    }

    // Read all the lines of the reply from server and print them to Serial

    Serial.println("receiving from remote server");

    // not testing 'client.connected()' since we do not need to send data here

    while (client.available())

    {

        char ch = static_cast(client.read());

        Serial.print(ch);

    }

    // Close the connection

    Serial.println();

    Serial.println("closing connection");

    client.stop();

    if (wait)

    {

//        delay(300000);  // execute once every 5 minutes, don't flood remote service

        delay(10000);  // execute once every 5 minutes, don't flood remote service

    }

    wait = true;

}

1. 예제 불러오기(파일 / 예제 / WiFi / WiFiClient

2. “your-ssid” 설정
3. “your-password” 설정

4. ç추가
5. ç추가 è개인 고유 KEY
6. Port 값 변경

7. Analog Pin 설정
8. Analog 전역변수 선언
9. Analog 값 변환 전역변수 선언

10. Analog Value Indicator LED Setting
11. Serial Monitoring Setting

12. Network Setting and Linkage

13. 서버 연결 완료 및 Client 정보 표시

14. Analog Read(0~1023)
15. Kpa 값으로 변환

16. sensorValue 값이 500 기준에 따른 표시

17. Server 연결 정보 표시

18. Cloud 에 보낼 정보

19. Client 에서 얻은 값

20. ç추가작업 : 정보 송신

21. 정보 업 로딩 시간 설정

Sensor Data Chart Display

Show Channel Location

Field 1 Gauge Options

Field 1 Value Options

Sharing 을 통해 데이터를 e-mail로 보낼 수 있다.

"Export recent data"를 통해 최근의 데이터를 Json, XML, CSV 등의 파일로 저장하여 활용할 수 있습니다

스마트폰용 앱을 설치해서 데이터를 확인해 볼수 있다.

“ThingView-ThingSpeak viewer”