When I try to compile this sketch DHTtester.ino , I get these errors:
DHTtester:10: error: 'DHT22' was not declared in this scope
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
^
/home/rob/sketchbook/libraries/DHT_sensor_library/examples/DHTtester/DHTtester.ino:24:17: note: in expansion of macro 'DHTTYPE'
DHT dht(DHTPIN, DHTTYPE);
^
/home/rob/sketchbook/libraries/DHT_sensor_library/examples/DHTtester/DHTtester.ino: In function 'void setup()':
DHTtester:30: error: 'class DHT' has no member named 'begin'
dht.begin();
^
/home/rob/sketchbook/libraries/DHT_sensor_library/examples/DHTtester/DHTtester.ino: In function 'void loop()':
DHTtester:39: error: 'class DHT' has no member named 'readHumidity'
float h = dht.readHumidity();
^
DHTtester:41: error: 'class DHT' has no member named 'readTemperature'
float t = dht.readTemperature();
^
DHTtester:43: error: 'class DHT' has no member named 'readTemperature'
float f = dht.readTemperature(true);
^
DHTtester:52: error: 'class DHT' has no member named 'computeHeatIndex'
float hif = dht.computeHeatIndex(f, h);
^
DHTtester:54: error: 'class DHT' has no member named 'computeHeatIndex'
float hic = dht.computeHeatIndex(t, h, false);
^
Multiple libraries were found for "DHT.h"
Used: /home/rob/sketchbook/libraries/DHT
Not used: /home/rob/sketchbook/libraries/arduino-DHT
Not used: /home/rob/sketchbook/libraries/DHT_sensor_library
Not used: /home/rob/Downloads/arduino-1.8.5/libraries/DHT-sensor-library-master
Using library DHT in folder: /home/rob/sketchbook/libraries/DHT (legacy)
exit status 1
'DHT22' was not declared in this scope
As can be seen all the DHT libraries are in the /sketchbook/libraries folder.
Is the actual sketch looking for a specific header or word.
#include "DHT.h"
#define DHTPIN 2 // 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)
// 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 4 (on the right) of the sensor to GROUND
// 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);
Serial.println("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("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(t);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *F\t");
Serial.print("Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.println(" *F");
}
Thanks