NodeMCU_ESP8266_Thingspeak_1.ino

#include "ThingSpeak.h"
#include <ESP8266WiFi.h>

//----------------  Fill in your credentails   ---------------------
char ssid[] = "xxx";             // your network SSID (name), tên wifi
char pass[] = "xxxxx";         // your network password, password
unsigned long myChannelNumber = 1;  // Replace the 0 with your channel number, channel của bạn
const char * myWriteAPIKey = "xxxxx";    // Paste your ThingSpeak Write API Key between the quotes, write API key
//------------------------------------------------------------------

WiFiClient  client;

int number = 0;

void setup() {
  //Mở port với baudrate 9600
  Serial.begin(9600);
  while (!Serial) {
    ; // Chờ kết nối USB, phục vụ công tác debug
  }

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  float h = random(100);
  float t = random(70);
  // Connect or reconnect to WiFi
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    //    Serial.println(SECRET_SSID);
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
  }

  // Ghi dữ liệu lên 1 field
  //  int x = ThingSpeak.writeField(myChannelNumber, 1, t, myWriteAPIKey);
  //  int y = ThingSpeak.writeField(myChannelNumber, 2, t, myWriteAPIKey);
  // Ghi dữ liệu lên nhiều field
  int x =  ThingSpeak.setField(1, h); //setField(field, value)
  int y =  ThingSpeak.setField(2, t); //setField(field, value)
  int z = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  // Kiểm tra return code
  if (z == 200) {
    Serial.println("Channel update successful.");
  }
  else {
    Serial.println("Problem updating channel. HTTP error code " + String(z));
  }

  delay(20000); // Chờ 20s trước khi gửi dữ liệu mới
}