Could help me with writing a code for DHT11 sensor for Arduino Uno WiFil Rev2
For connecting using blynk app
I am using original version 1.00 could you help
#include “DHT.h”
#include <SPI.h>
#include <Blynk.h>
#include <SoftwareSerial.h>
#define BLYNK_PRINT Serial
#define DHTPIN 12 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 –
// Pin 15 can work but DHT must be disconnected during program upload.
// Uncomment whatever type you’re using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
char auth[] = “WQ8xr1TB8UkmwMYhuUT8Ruqaz_vqqLrY”;
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins)
// Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins)
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
// You can also specify server:
//Blynk.begin(auth, ssid, pass, “blynk-cloud.com”, 80);
//Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);
Serial.println(F(“DHTxx test!”));
dht.begin();
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds ‘old’ (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F(“Failed to read from DHT sensor!”));
return;
Blynk.virtualWrite(V5, h);
Blynk.virtualWrite(V6, t);
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: “));
Serial.print(h);
Serial.print(F(”% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F(“°F”));
Blynk.run();
}
While running this code iam getting error
In file included from C:\Users\DHT11\Blynk\Blynk.ino:3:0:
C:\Users\Documents\Arduino\libraries\Blynk\src/Blynk.h:15:2: warning: #warning “Please include a board-specific header file, instead of Blynk.h (see examples)” [-Wcpp]
#warning “Please include a board-specific header file, instead of Blynk.h (see examples)”
^~~
C:\Users\Desktop\DHT11\Blynk\Blynk.ino: In function ‘void loop()’:
Blynk:79:3: error: ‘Blynk’ was not declared in this scope
Blynk.run();
^~~
C:\Users\DHT11\Blynk\Blynk.ino:79:3: note: suggested alternative: ‘Blynk_h’
Blynk.run();
^~~
Blynk_h
exit status 1
‘Blynk’ was not declared in this scope
This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preference