ESP32-將數值發佈到 ThingSpeak（最簡單的方法）－凶王的部落

先到thingspeak官網,之前沒註冊的話就辦一個

https://thingspeak.com/login?skipSSOCheck=true

選CHANNEL,點mychannels

點 new channel

選channel settings,照下圖新增資料欄位

好了之後拉到最下面按SAVE

點Private View ,在下面的" Field 1 Chart " ,點右邊那隻筆

因為範例會顯示出三個數值的曲線,所以先依照下圖順序設定三個視窗鎖鑰顯示的內容

接著選API KEYS,待會會用到 Write API KEY

下面是範例程式碼

//https://randomnerdtutorials.com/esp32-thingspeak-publish-arduino/
#include <WiFi.h>
#include "ThingSpeak.h"

const char* ssid = "你的熱點"; // your network SSID (name)
const char* password = "熱點密碼"; // your network password

WiFiClient client;
//輸入您的頻道號以及您的寫入 API 密鑰
unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "0ICFB705K2YI5Y69";

// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 15000;//極限時間,在短可能會來不及處理請求

// Variable to hold temperature readings
int randvalue1;
int randvalue2;
int randvalue3;

void setup() {
Serial.begin(115200); //Initialize serial
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client); // Initialize ThingSpeak
}

void loop() {
if ((millis() - lastTime) > timerDelay) {

// Connect or reconnect to WiFi
if(WiFi.status() != WL_CONNECTED){
Serial.print("Attempting to connect");//沒連上的顯示
while(WiFi.status() != WL_CONNECTED){
WiFi.begin(ssid, password);
delay(3000);
}
Serial.println("\nConnected.");//連上的顯示
}

// Get a new temperature reading
randvalue1 = random(50);
Serial.print("randvalue1: ");
Serial.println(randvalue1);
randvalue2 = random(100);
Serial.print("randvalue2: ");
Serial.println(randvalue2);
randvalue3 = random(20);
Serial.print("randvalue3: ");
Serial.println(randvalue3);

ThingSpeak.setField(1, randvalue1);
ThingSpeak.setField(2, randvalue2);
ThingSpeak.setField(3, randvalue3);

// Write 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.
int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
//uncomment if you want to get randvalue1 in Fahrenheit
//int x = ThingSpeak.writeField(myChannelNumber, 1, randvalue1, myWriteAPIKey);

if(x == 200){
Serial.println("Channel update successful.");
}
else{
Serial.println("Problem updating channel. HTTP error code " + int(x));
}
lastTime = millis();
}
}

下圖是執行結果: