NodeMCU-DS18B20-ThingSpeak
NODEMCU-DS18B20-ThingSpeak
เขียนโค้ดและโหลดลงบอร์ด NODEMCU ได้ดังนี้
#include <esp8266wifi .h>
#include <onewire .h>
#include <dallastemperature .h>
#define ONE_WIRE_BUS D3
const char* ssid = "MKY_true_FTTx"; // กำหนด SSID[Wifi] (อย่าลืมแก้เป็นของตัวเอง)
const char* password = "08199928031"; // กำหนด Password [Wifi](อย่าลืมแก้เป็นของตัวเอง)";
String apiKey = "XY0S5VLCFF5BMNDK"; // API KEY ที่ได้จาก ThingSpeak
const char* server = "api.thingspeak.com";
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
WiFiClient client;
void setup()
{ Serial.begin(115200);
delay(1000);
sensors.begin();
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{ delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void loop()
{ Serial.println("-------------------------");
Serial.print("Requesting temperatures...");
sensors.requestTemperatures(); // Send the command to get temperatures
float cTemp = sensors.getTempCByIndex(0);
Serial.print("Temperature is: "); Serial.println(cTemp, 4); // Display Temperature
if (client.connect(server, 80)) // "184.106.153.149" or api.thingspeak.com
{ String postStr = apiKey;
postStr += "&field1=";
postStr += String(cTemp);
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('C)= ");
Serial.println(cTemp, 4);
}
client.stop();
Serial.println("Waiting...");
delay(20000); // thingspeak needs minimum 15 sec delay between updates
}
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