+ 0.1.08

+ minor revision of comments + added formula for timeout to support DUE

Author: RobTillaart

libraries/DHTlib/dht.cpp

@@ -1,11 +1,12 @@
 //
 // FILE: dht.cpp
 // AUTHOR: Rob Tillaart
-// VERSION: 0.1.07
+// VERSION: 0.1.08
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
 // URL: http://arduino.cc/playground/Main/DHTLib
 //
 // HISTORY:
+// 0.1.08 added formula for timeout based upon clockspeed
 // 0.1.07 added support for DHT21
 // 0.1.06 minimize footprint (2012-12-27)
 // 0.1.05 fixed negative temperature bug (thanks to Roseman)
@@ -22,7 +23,11 @@
 
 #include "dht.h"
 
-#define TIMEOUT (F_CPU/1600) // unsigned int in code, for higher CPU speeds this might exceed MAXINT.
+// #define TIMEOUT 10000 
+// uint16_t for UNO, higher CPU speeds => exceed MAXINT.
+// works for DUE
+#define TIMEOUT (F_CPU/1600) 
+
 
 /////////////////////////////////////////////////////
 //
@@ -45,7 +50,7 @@ int dht::read11(uint8_t pin)
 }
 
 // CONVERT AND STORE
-humidity = bits[0]; // bit[1] == 0;
+humidity = bits[0]; // bits[1] == 0;
 temperature = bits[2]; // bits[3] == 0;
 
 // TEST CHECKSUM
@@ -124,6 +129,7 @@ int dht::read(uint8_t pin)
 delayMicroseconds(40);
 pinMode(pin, INPUT);
 
+ // TODO rewrite with miros()?
 // GET ACKNOWLEDGE or TIMEOUT
 unsigned int loopCnt = TIMEOUT;
 while(digitalRead(pin) == LOW)

libraries/DHTlib/dht.h

@@ -1,7 +1,7 @@
 //
 // FILE: dht.h
 // AUTHOR: Rob Tillaart
-// VERSION: 0.1.07
+// VERSION: 0.1.08
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
 // URL: http://arduino.cc/playground/Main/DHTLib
 //
@@ -18,7 +18,7 @@
 #include <Arduino.h>
 #endif
 
-#define DHT_LIB_VERSION "0.1.07"
+#define DHT_LIB_VERSION "0.1.08"
 
 #define DHTLIB_OK0
 #define DHTLIB_ERROR_CHECKSUM-1