ThingSpeak

De temperatuur en luchtvochtigheid wordt gemeten met behulp van de DHT11 sensor. De sensorwaardes worden naar ThingSpeak gestuurd en zijn zo via de webbrowser af te lezen.
De microcontroller is een NodeMCU (esp8266) en de code is in de Arduio IDE gemaakt.
De ESP 8266 moet wel nog toegevoegd worden aan de borden in Arduino. In de video hieronder kan je zien hoe dat moet. Helemaal beneden staat de gebruikte code van de video hiernaast. Vergeet niet de bibliotheek te installeren (<DTH.h>).

// dht11 & nodeMCU Tutorial || Humidity Monitoring over Thingspeak
// https://www.youtube.com/watch?v=jYjuxWUefhg
// https://how2electronics.com/dht11-humidity-temperature-nodemcu-thingspeak/

#include <DHT.h> // Including library for dht
#include <ESP8266WiFi.h>

String apiKey = "MB1GI5Y0MR6068I9"; // Enter your Write API key from ThingSpeak
const char *ssid = "H220N852652"; // replace with your wifi ssid and wpa2 key
const char *pass = "6D992BD18AFC";
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, pass);
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
delay(1000);
}