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
