Fix issue #111 - DHT12 negative temperature

Author: RobTillaart

libraries/DHT12/DHT12.cpp

@@ -1,13 +1,15 @@
 //
 // FILE: DHT12.cpp
 // AUTHOR: Rob Tillaart
-// VERSION: 0.1.1
+// VERSION: 0.1.2
 // PURPOSE: I2C library for DHT12 for Arduino.
 //
 // HISTORY:
 // 0.1.0: 2017-12-11 initial version
 // 0.1.1: 2017-12-19 added ESP8266 - issue #86
 // Verified by Viktor Balint
+// 0.1.2: 2018-09-02 fix negative temperature DHT12 - issue #111
+//
 //
 // Released to the public domain
 //
@@ -42,8 +44,8 @@ int8_t DHT12::read()
 
  // CONVERT AND STORE
  humidity = bits[0] + bits[1] * 0.1;
- temperature = (bits[2] & 0x7F) + bits[3] * 0.1;
- if (bits[2] & 0x80)
+ temperature = bits[2] + (bits[3] & 0x7F) * 0.1;
+ if (bits[3] & 0x80)
  {
  temperature = -temperature;
  }

libraries/DHT12/DHT12.h

@@ -4,7 +4,7 @@
 // FILE: DHT12.h
 // AUTHOR: Rob Tillaart
 // PURPOSE: DHT_I2C library for Arduino .
-// VERSION: 0.1.1
+// VERSION: 0.1.2
 // HISTORY: See DHT12.cpp
 // URL: https://github.com/RobTillaart/Arduino/tree/master/libraries/
 //
@@ -14,7 +14,7 @@
 #include "Wire.h"
 #include "Arduino.h"
 
-#define DHT12_VERSION "0.1.1"
+#define DHT12_VERSION "0.1.2"
 
 #define DHT12_OK 0
 #define DHT12_ERROR_CHECKSUM -10

libraries/DHT12/library.json

@@ -15,7 +15,7 @@
  "type": "git",
  "url": "https://github.com/RobTillaart/Arduino.git"
  },
- "version":"0.1.1",
+ "version":"0.1.2",
  "frameworks": "arduino",
  "platforms": "*",
  "export": {

libraries/DHT12/library.properties

@@ -1,5 +1,5 @@
 name=DHT12
-version=0.1.1
+version=0.1.2
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=I2C Library for DHT12 Temperature and Humidity. 

libraries/DHTlib/dht.cpp

@@ -1,11 +1,12 @@
 //
 // FILE: dht.cpp
 // AUTHOR: Rob Tillaart
-// VERSION: 0.1.28
+// VERSION: 0.1.29
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
 // URL: http://arduino.cc/playground/Main/DHTLib
 //
 // HISTORY:
+// 0.1.29 2018-09-02 fix negative temperature DHT12 - issue #111
 // 0.1.28 2018-04-03 refactor
 // 0.1.27 2018-03-26 added _disableIRQ flag
 // 0.1.26 2017-12-12 explicit support for AM23XX series and DHT12
@@ -85,8 +86,8 @@ int8_t dht::read12(uint8_t pin)
 
  // CONVERT AND STORE
  humidity = bits[0] + bits[1] * 0.1;
- temperature = (bits[2] & 0x7F) + bits[3] * 0.1;
- if (bits[2] & 0x80) // negative temperature
+ temperature = bits[2] + (bits[3] & 0x7F) * 0.1;
+ if (bits[3] & 0x80) // negative temperature
  {
  temperature = -temperature;
  }

libraries/DHTlib/dht.h

@@ -1,7 +1,7 @@
  //
 // FILE: dht.h
 // AUTHOR: Rob Tillaart
-// VERSION: 0.1.28
+// VERSION: 0.1.29
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
 // URL: http://arduino.cc/playground/Main/DHTLib
 //
@@ -19,7 +19,7 @@
 #include <Arduino.h>
 #endif
 
-#define DHT_LIB_VERSION "0.1.28"
+#define DHT_LIB_VERSION "0.1.29"
 
 #define DHTLIB_OK 0
 #define DHTLIB_ERROR_CHECKSUM -1

libraries/DHTlib/library.json

@@ -15,7 +15,7 @@
  "type": "git",
  "url": "https://github.com/RobTillaart/Arduino.git"
  },
- "version":"0.1.28",
+ "version":"0.1.29",
  "frameworks": "arduino",
  "platforms": "*",
  "export": {

libraries/DHTlib/library.properties

@@ -1,5 +1,5 @@
 name=DHTlib
-version=0.1.28
+version=0.1.29
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Optimized Library for DHT Temperature & Humidity Sensor on AVR only.