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Crowbits-DHT20

Description

DHT20 is an intelligent temperature and humidity sensor module that can convert temperature and humidity into electrical signals to easily measure temperature and humidity. The module is equipped with a newly designed ASIC dedicated chip, an improved MEMS semiconductor capacitive humidity sensor element and a standard temperature sensor element. After comprehensive improvement, DHT20 reduces power consumption and cost, while greatly improving measurement accuracy, power supply voltage, measurement range, response time, stability, etc.; it has the characteristics of no calibration, low power consumption, high accuracy, and high stability. Using fully calibrated digital I2C communication interface, it has fast response, strong anti-interference ability and high cost performance.

Crowbits-dht20-1.png

Technical specifications

Working voltage: DC2.2V+5.5V

Measuring range

  • Humidity: 0%-100% RH
  • Temperature: -40~80°C

Error range

  • Humidity: ±3% RH
  • Temperature: ±0.5°C

Resolution

  • Humidity: ±0.024% RH
  • Temperature: 0.01°C

Response time

  • Humidity: τ63% condition is less than 8 seconds
  • Temperature: τ63% condition mini5 seconds, max30 seconds

Interface type: I2C
Size: 31.5 (L)*24.5(W)*13(H)mm

Application scenarios

Test environment temperature and humidity 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 A4 and A5 interface on the Crowbits-UNO board, as shown in the figure below:

Crowbits-dht20-2.png

3. Download the Crowbit-DHT20 software file and unzip it and place it in the libraries folder of the Arduino IDE. Run Arduino.exe, Open path: Crowtail-DHT20 --> examples --> DHT20 --> DHT20.ino

#include <DHT20.h>
/*!
 * @brief Construct the function
 * @param pWire IC bus pointer object and construction device, can both pass or not pass parameters, Wire in default.
 * @param address Chip IIC address, 0x38 in default.
 */
DHT20  dht20;
void setup()
{
  Serial.begin(115200);
  //Initialize sensor
  while(dht20.begin())
{
    Serial.println("Initialize sensor failed");
    delay(1000);
   }
}

void loop()
{
  //Get ambient temperature
  Serial.print("temperature:"); Serial.print(dht20.getTemperature());Serial.print("℃");
  //Get relative humidity
  Serial.print("  humidity:"); Serial.print(dht20.getHumidity()*100);Serial.println(" %RH");
    delay(1000);
}

4. Upload it to your Crowbits-UNO board, open the COM serial port, select 115200 for the baud rate at the bottom right, and the monitor displays the current environmental temperature and relative humidity information.

Crowbits-dht20-3.png