HO WING KIT / DHT22

=DHT22 Temperature and Humidity Sensor= The DHT-22 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn\\\'t require extra components so you can get right to measuring relative humidity and temperature. [[http://dlnmh9ip6v2uc.cloudfront.net/images/products/10167-01_i_ma.jpg]] Features: * 3.3-6V Input * 1-1.5mA measuring current * 40-50 uA standby current * Humidity from 0-100% RH * -40 - 80 degrees C temperature range * +-2% RH accuracy * +-0.5 degrees C ***(same as RHT03 www.humiditycn.com)*** Available as http://www.sparkfun.com/products/10167 | DHT22(pin) | Function | mbed | | 1 - VDD | VDD-power supply (3.3-6V) | (Vout) 5V | | 2 - DATA | Single pin signal | p15 | | 3 - NULL | | | | 4 - GND | Connect to ground | GND | == Library == <<library /users/hwkit/libraries/DHT22/latest/docs/DHT22_8h_source.html>> &lt;<library users=\"\" hwkit=\"\" libraries=\"\" dht22=\"\" latest=\"\" docs=\"\" dht22_8cpp_source.html=\"\">&gt;</library>

--- a/DHT22.h	Tue Jun 21 03:44:05 2011 +0000
+++ b/DHT22.h	Mon Jul 04 07:35:03 2011 +0000
@@ -24,6 +24,7 @@
 #define MBED_DHT22_H
 
 #include "mbed.h"
+#include "NokiaLCD.h"
 
 /**
  * Currently supports DHT22 (SparkFun Electronics)
@@ -45,6 +46,10 @@
  *
  * int main() {
  *     err=dth22.readData();
+ *     if (err==0) {
+          printf("Temperature is %f.2 C\n",dht22.getTemperature());
+          printf("Humidity is %f.2 \%\n",dht22.getHumidity());
+       }
  *
  *
  */
@@ -64,14 +69,10 @@
 
 class DHT22 {
 private:
-    uint8_t _bitmask;
-    volatile uint8_t *_baseReg;
     time_t  _lastReadTime;
-    PinName _vcc, _data;
-    int     m_addr;
+    PinName _data;
     float   _lastHumidity;
     float   _lastTemperature;
-
 public:
     DHT22(PinName Data);
     ~DHT22();