Crowbits-DHT11 Sensor

Description¶

Temperature and humidity sensors refer to devices or devices that can convert temperature and humidity into electrical signals that can be easily measured and processed.

Features¶

Digital reading accuracy

Specification¶

Interface Type：GPIO
Operating Voltage: 3.3V DC
Dimensions: 31.5(L)*24.5(W)*13(H)mm

Application Ideas¶

Display test information

Usage¶

The following sketch demonstrates a simple application.

1. You need to prepare a Crowbits motherboard, such as Crowbits-UNO board.

2. Connect the module to the A0 interface on the Crowbits-UNO board, as shown in the figure:

3. Download the library Crowbits-DHT11 Sensor library. Unzip and put it in the libraries file, for example: C:\Program Files (x86)\Arduino\libraries.

4. Upload the following code to the Crowbits-UNO board.

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain

#include "DHT.h"

#define DHTPIN A0     // what pin we're connected to

// Uncomment whatever type you're using!
#define DHTTYPE DHT11   // DHT 11 
//#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +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

DHT dht(DHTPIN, DHTTYPE);

void setup() 
{
    Serial.begin(9600); 
    Serial.println("DHTxx test!");

    dht.begin();
}

void loop() 
{
    // 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();
    float t = dht.readTemperature();

    // check if returns are valid, if they are NaN (not a number) then something went wrong!
    if (isnan(t) || isnan(h)) 
    {
        Serial.println("Failed to read from DHT");
    } 
    else 
    {
        Serial.print("Humidity: "); 
        Serial.print(h);
        Serial.print(" %\t");
        Serial.print("Temperature: "); 
        Serial.print(t);
        Serial.println(" *C");
    }
}

5.After the code is uploaded successfully, Open the debug window and observe the displayed humidity and temperature.