NodeMCU Temperature, Humidity data upload on Thingspeak on Arduino IDE
// Simple code upload the tempeature and humidity data using thingspeak.com
// Hardware: NodeMCU,DHT11
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include <ESP8266WiFi.h>
//String apiKey = "Your API of thingsspeak"; // Enter your Write API key from ThingSpeak
String apiKey = "3V8PO4MIDZ5DGKMT"; // Enter your Write API key from ThingSpeak
//const char *ssid = "Your wifi Network name"; // replace with your wifi ssid and wpa2 key
//const char *pass = "Network password";
const char* ssid = "74170287";
const char* password = "24063173";
const char* server = "api.thingspeak.com";
#define DHTPIN 0 //pin where the dht11 is connected
DHT dht(DHTPIN, DHT11);
WiFiClient client;
void setup()
{
Serial.begin(115200);
delay(10);
dht.begin();
Serial.println("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop()
{
float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t))
{
Serial.println("Failed to read from DHT sensor!");
return;
}
if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com
{
String postStr = apiKey;
postStr +="&field1=";
postStr += String(t);
postStr +="&field2=";
postStr += String(h);
postStr += "\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);
Serial.print("Temperature: ");
Serial.print(t);
Serial.print(" degrees Celcius, Humidity: ");
Serial.print(h);
Serial.println("%. Send to Thingspeak.");
}
client.stop();
Serial.println("Waiting...");
// thingspeak needs minimum 15 sec delay between updates, i've set it to 30 seconds
delay(10000);
}
您好,請問最近ThingSpeak的上傳方式有改嗎?
回覆刪除我照著您的做法做一遍,但是資料傳不上去~
已知:
1.開發版確定有聯網
2.在瀏覽器上直接輸入https://api.thingspeak.com/update?api_key=###########&field1=0是有用的
3.想請問您為甚麼要使用POST方法而不是API KEY網頁右下角給的GET方法範例,有什麼不一樣的地方嗎?
謝謝
我找到答案了:
回覆刪除https://community.thingspeak.com/forum/announcements/sending-data-to-thingspeak-api-from-device-but-channel-is-not-updated-what-changed/
Vinod於2019.1.4寫到
「需使用delay等待伺服器回應,再傳送下一個client.print()指令」
他也建議改用:
https://github.com/mathworks/thingspeak-arduino的library讓上傳更穩定