The Arduino Sensor Kit comes with one of these temperature and humidity sensors:

• DHT11 temperature and humidity sensor^[1]
• DHT20 temperature and humidity sensor^[2]

The DHT20 is a newer sensor with I²C support, but may require some configuration when used with the Arduino_SensorKit library.

Identify which sensor you have

The easiest way to identify which sensor is in your kit, is by looking at the color of the sensor module:

Using the DHT20 sensor

Use Arduino_Sensorkit v1.0.10 or later

Support for the DHT20 temperature and humidity sensor was added to the Arduino_Sensorkit library in version 1.0.10^[3]. Older versions of the library could not correctly read values from the sensor, resulting in NaN (Not a Number) values in the serial monitor output. To use a DHT20 sensor with the library, make sure to update to version 1.0.10 or later.

Follow these steps to update the Arduino_Sensorkit library in Arduino IDE:

1. Click the Library Manager button (or select Tools > Manage Libraries).

2. Search for “Arduino_SensorKit”.

3. Make sure 1.0.10 or later is selected and click Update.

   

4. If you’re asked whether you’d like to install library dependencies, click Install all.

5. Wait for the update process to finish.

The Web Editor uses the latest version of all libraries by default.

Uncomment lines for the DHT20

The Temp_and_Humidity.ino example contains two lines of code that should be uncommented if you’re using the DHT20 sensor.

The modified sketch looks like this:

//#define DHTPIN 3 // By default its connected to pin D3, it can be changed, define it before the #include of the library
#include "Arduino_SensorKit.h"

//uncomment line below if using DHT20
#define Environment Environment_I2C

void setup() {
  //uncomment line below if using DHT20
  Wire.begin();
  Serial.begin(9600);
  Environment.begin();
}

void loop() {
  Serial.print("Temperature = ");
  Serial.print(Environment.readTemperature()); //print temperature
  Serial.println(" C");
  Serial.print("Humidity = ");
  Serial.print(Environment.readHumidity()); //print humidity
  Serial.println(" %");
  delay(2000);
}