Temperature and Humidity Sensor - Revision history

Alvin at 11:25, 19 April 2016

2016-04-19T11:25:40Z

Alvin: /* Test tools and test */

2016-04-19T11:14:33Z

‎Test tools and test

Alvin: /* Test */

2016-04-19T11:13:49Z

‎Test

Alvin: /* Test tools and test */

2016-04-19T11:09:13Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T11:07:58Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T11:07:28Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T11:06:44Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T11:06:10Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T11:05:30Z

‎Test tools and test

Alvin: /* Test tools and test */

2016-04-19T10:51:12Z

‎Test tools and test

@@ Line 3: / Line 3: @@
 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.
-[[File:1-214.jpg]]
+[[File:1-214.jpg|600px]]
-[[File:1-215.jpg]]
+[[File:1-215.jpg|600px]]

@@ Line 38: / Line 38: @@
     void setup(void)
+   {
-   // start serial port
+  // start serial port
-   Serial.begin(9600);
+  Serial.begin(9600);
-   Serial.println("DHT22 Library Demo");
+  Serial.println("DHT22 Library Demo");
-−
+  }
     void loop(void)
+    {

@@ Line 47: / Line 47: @@
    // The sensor can only be read from every 1-2s, and requires a minimum
    // 2s warm-up after power-on.
-delay(2000);
+  delay(2000);
 (3)Test Results

@@ Line 47: / Line 47: @@
    // The sensor can only be read from every 1-2s, and requires a minimum
    // 2s warm-up after power-on.
-  delay(2000);
+delay(2000);
 (3)Test Results

@@ Line 46: / Line 46: @@
     DHT22_ERROR_t errorCode;
    // The sensor can only be read from every 1-2s, and requires a minimum
-// 2s warm-up after power-on.
+  // 2s warm-up after power-on.
-  delay(2000);
+  delay(2000);
 (3)Test Results

@@ Line 28: / Line 28: @@
 （2）、Program
-  #include <DHT22.h>
+   #include <DHT22.h>
-  // Only used for sprintf
+   // Only used for sprintf
-  #include <stdio.h>
+   #include <stdio.h>
-  // Data wire is plugged into port 7 on the Arduino
+   // Data wire is plugged into port 7 on the Arduino
-  // Connect a 4.7K resistor between VCC and the data pin (strong pullup)
+   // Connect a 4.7K resistor between VCC and the data pin (strong pullup)
-  #define DHT22_PIN 7
+   #define DHT22_PIN 7
-  // Setup a DHT22 instance
+   // Setup a DHT22 instance
-  DHT22 myDHT22(DHT22_PIN);
+   DHT22 myDHT22(DHT22_PIN);
-  void setup(void)
+   void setup(void)
-−
+  {
-  // start serial port
+   // start serial port
-  Serial.begin(9600);
+   Serial.begin(9600);
-  Serial.println("DHT22 Library Demo");
+   Serial.println("DHT22 Library Demo");
-−
+   }
-  void loop(void)
+   void loop(void)
-−
+   {
-  DHT22_ERROR_t errorCode;
+   DHT22_ERROR_t errorCode;
+   // The sensor can only be read from every 1-2s, and requires a minimum
-  // The sensor can only be read from every 1-2s, and requires a minimum
+   // 2s warm-up after power-on.
-  // 2s warm-up after power-on.
+   delay(2000);
-  delay(2000);
+   Serial.print("Requesting data...");
+   errorCode = myDHT22.readData();
-  Serial.print("Requesting data...");
+   switch(errorCode)
-  errorCode = myDHT22.readData();
-  switch(errorCode)
+     case DHT_ERROR_NONE:
+       Serial.print("Got Data ");
-    case DHT_ERROR_NONE:
+       Serial.print(myDHT22.getTemperatureC());
-      Serial.print("Got Data ");
+       Serial.print("C ");
-      Serial.print(myDHT22.getTemperatureC());
+       Serial.print(myDHT22.getHumidity());
-      Serial.print("C ");
+       Serial.println("%");
-      Serial.print(myDHT22.getHumidity());
+       // Alternately, with integer formatting which is clumsier but more compact to store and
-      Serial.println("%");
+       // can be compared reliably for equality:
-      // 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",
-      char buf[128];
+                    myDHT22.getTemperatureCInt()/10, abs(myDHT22.getTemperatureCInt()%10),
-      sprintf(buf, "Integer-only reading: Temperature %hi.%01hi C, Humidity %i.%01i %% RH",
+                    myDHT22.getHumidityInt()/10, myDHT22.getHumidityInt()%10);
-                   myDHT22.getTemperatureCInt()/10, abs(myDHT22.getTemperatureCInt()%10),
+       Serial.println(buf);
-                   myDHT22.getHumidityInt()/10, myDHT22.getHumidityInt()%10);
+       break;
-      Serial.println(buf);
+     case DHT_ERROR_CHECKSUM:
-      break;
+       Serial.print("check sum error ");
-    case DHT_ERROR_CHECKSUM:
+       Serial.print(myDHT22.getTemperatureC());
-      Serial.print("check sum error ");
+       Serial.print("C ");
-      Serial.print(myDHT22.getTemperatureC());
+       Serial.print(myDHT22.getHumidity());
-      Serial.print("C ");
+       Serial.println("%");
-      Serial.print(myDHT22.getHumidity());
+       break;
-      Serial.println("%");
+     case DHT_BUS_HUNG:
-      break;
+       Serial.println("BUS Hung ");
-    case DHT_BUS_HUNG:
+       break;
-      Serial.println("BUS Hung ");
+     case DHT_ERROR_NOT_PRESENT:
-      break;
+       Serial.println("Not Present ");
-    case DHT_ERROR_NOT_PRESENT:
+       break;
-      Serial.println("Not Present ");
+     case DHT_ERROR_ACK_TOO_LONG:
-      break;
+       Serial.println("ACK time out ");
-    case DHT_ERROR_ACK_TOO_LONG:
+       break;
-      Serial.println("ACK time out ");
+     case DHT_ERROR_SYNC_TIMEOUT:
-      break;
+       Serial.println("Sync Timeout ");
-    case DHT_ERROR_SYNC_TIMEOUT:
+       break;
-      Serial.println("Sync Timeout ");
+     case DHT_ERROR_DATA_TIMEOUT:
-      break;
+       Serial.println("Data Timeout ");
-    case DHT_ERROR_DATA_TIMEOUT:
+       break;
-      Serial.println("Data Timeout ");
+     case DHT_ERROR_TOOQUICK:
-      break;
+       Serial.println("Polled to quick ");
-    case DHT_ERROR_TOOQUICK:
+       break;
-      Serial.println("Polled to quick ");
 (3)Test Results