I am using a Linknode D1 and have no problems when running the DHT Tester sketch.
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain#include “DHT.h”
#define DHTPIN D8 // what digital pin we’re connected to
// Uncomment whatever type you’re using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println(“DHT11 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(“Failed to read from DHT sensor!”);
return;
}// 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(“Humidity: “);
Serial.print(h);
Serial.print(” %\t”);
Serial.print(“Temperature: “);
Serial.print(f);
Serial.print(” *F\t”);
Serial.print(“Heat index: “);
Serial.print(hif);
Serial.println(” *F”);
}
However when I run the following:
/*
Cayenne ESP8266 WiFi Example*/
//#define CAYENNE_DEBUG // Uncomment to show debug messages
#define CAYENNE_PRINT Serial // Comment this out to disable prints and save space
#include <CayenneESP8266WiFi.h>#include “DHT.h”
#define DHTPIN D8 // what digital pin we’re connected to
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);#include “CayenneDefines.h”
// Cayenne authentication token. This should be obtained from the Cayenne Dashboard.
char token = “xxxx”;
// Your network name and password.
char ssid = “xxxx”;
char password = “xxxx”;void setup()
{
Serial.begin(9600);
Cayenne.begin(token, ssid, password);}
void loop()
{
Cayenne.run();// Wait a few seconds between measurements.delay(3000);
// 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 Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(f)) {
Serial.println(“Failed to read from DHT sensor!”);
return;
}Serial.print(“Humidity: “);
Serial.print(h);
Serial.print(” %\t”);
Serial.print(“Temperature: “);
Serial.print(f);
Serial.println(” *F\t”);}
// These functions are called when the Cayenne widget requests data for the Virtual Pin.
CAYENNE_OUT(V0)
{
Cayenne.virtualWrite(V0, dht.readTemperature(true));
}CAYENNE_OUT(V1)
{
Cayenne.virtualWrite(V1, dht.readHumidity());
}
Most of the time I get the “Failed to read from DHT sensor!” error.
Please suggest how I can fix the inconsistent error.
Thanks!