Temperature and Humidity Sensor

Introduction

This is a powerful sister version of our Linker kit - Temperature and Humidity Sensor. It has more complete and accurate performance. The detecting range of this sensor is 5% RH - 99% RH, and -40°C - 80°C. And its accuracy satisfyingly reaches up to 2% RH and 0.5°C. A professional choice for applications that have relatively strict requirements.

Specification

Platforms Supported

• Arduino
• Raspberry Pi

Test

Test tools and test

(1)Test tools

• Arduino UNO x 1 
• Linker Base Shield x 1
• Linker temperature & humidity sensor ｘ１

（2）、Program

  #include <DHT22.h>
  // Only used for sprintf
  #include <stdio.h>
  // Data wire is plugged into port 7 on the Arduino
  // Connect a 4.7K resistor between VCC and the data pin (strong pullup)
  #define DHT22_PIN 7
  // Setup a DHT22 instance
  DHT22 myDHT22(DHT22_PIN);
  void setup(void)
 {

   // start serial port    Serial.begin(9600);    Serial.println("DHT22 Library Demo");

  }
  void loop(void)
  { 
  DHT22_ERROR_t errorCode;
 // The sensor can only be read from every 1-2s, and requires a minimum
 // 2s warm-up after power-on.
 delay(2000);
 Serial.print("Requesting data...");
 errorCode = myDHT22.readData();
 switch(errorCode)
 {
 case DHT_ERROR_NONE:
 Serial.print("Got Data ");
 Serial.print(myDHT22.getTemperatureC());
 Serial.print("C ");
 Serial.print(myDHT22.getHumidity());
 Serial.println("%");
 // Alternately, with integer formatting which is clumsier but more compact to store and
 // can be compared reliably for equality:
 //
 char buf[128];
 sprintf(buf, "Integer-only reading: Temperature %hi.%01hi C, Humidity %i.%01i %% RH",
 myDHT22.getTemperatureCInt()/10, abs(myDHT22.getTemperatureCInt()%10),
 myDHT22.getHumidityInt()/10, myDHT22.getHumidityInt()%10);
 Serial.println(buf);
 break;
 case DHT_ERROR_CHECKSUM:
 Serial.print("check sum error ");
 Serial.print(myDHT22.getTemperatureC());
 Serial.print("C ");
 Serial.print(myDHT22.getHumidity());
 Serial.println("%");
 break;
 case DHT_BUS_HUNG:
 Serial.println("BUS Hung ");
 break;
 case DHT_ERROR_NOT_PRESENT:
 Serial.println("Not Present ");
 break;
 case DHT_ERROR_ACK_TOO_LONG:
 Serial.println("ACK time out ");
 break;
 case DHT_ERROR_SYNC_TIMEOUT:
 Serial.println("Sync Timeout ");
 break;
 case DHT_ERROR_DATA_TIMEOUT:
 Serial.println("Data Timeout ");
 break;
 case DHT_ERROR_TOOQUICK:
 Serial.println("Polled to quick ");
 break;

(3)Test Results

Documents

Test code download