diff --git a/LICENSE b/LICENSE
index cfc58f9..8a10ac6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2011-2021 Rob Tillaart
+Copyright (c) 2011-2022 Rob Tillaart
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 0f3d412..2c9a3d8 100644
--- a/README.md
+++ b/README.md
@@ -57,12 +57,12 @@ See examples
 ==> See DHTStable library for latest stable version for all platforms.
 
 - version 0.1.13 is the last stable version for both AVR and ARM 
-- version 0.1.14 and up are not compatible anymore with pre 1.0 Arduino. 
-These have breaking changes wrt ARM based arduino's e.g DUE.
+- version 0.1.14 and up are not compatible any more with pre 1.0 Arduino. 
+These have breaking changes wrt ARM based Arduino's e.g DUE.
 - version 0.1.15 is stable version for AVR only
 - version 0.1.16 and 0.1.17 have breaking changes for DHT11
-- version 0.1.18 works again for DHT11 (avr only)
-- version 0.1.19 fixed masking bug DHT11 (avr only)
+- version 0.1.18 works again for DHT11 (AVR only)
+- version 0.1.19 fixed masking bug DHT11 (AVR only)
 - version 0.1.20 Reduce footprint (34 bytes) by using int8_t as error codes. (thanks to chaveiro)
 - version 0.1.21 replace delay with delayMicroseconds() + small fix (thanks to codingforfun)
 - version 0.1.22 undo delayMicroseconds() for wakeups larger than 8
@@ -70,8 +70,24 @@ These have breaking changes wrt ARM based arduino's e.g DUE.
 - version 0.1.24 fix https://github.com/RobTillaart/Arduino/issues/33
 - version 0.1.25 fix https://github.com/RobTillaart/Arduino/issues/80
 - version 0.1.26 Explicit support for AM23XX series and DHT12
-- version 0.1.27 added _disableIRQ flag
+- version 0.1.27 added \_disableIRQ flag
 - version 0.1.28 refactor
 - version 0.1.29 fix negative temperature DHT12 - issue #111
 - version 0.1.30 own repo version
+- version 0.1.31 fix negative temperature DHT22 (code from DHTNew)
+- version 0.1.32 fix negative temperature DHT22 again (code from DHTNew)
+- version 0.1.33 fix #6 T-GO signal in handshake. (needed for long wires)
+- version 0.1.34 fix negative temperature DHT22 again (code from DHTNew)
+- version 0.1.35 update license, library.json, #pragma once, minor edits
+
+
+## Future
+
+- updates only on request basis (bugs)
+- improve documentation
+- improve unit tests
+  - constants
+- move non public part of #defines to .cpp
+- separate history versions releasenotes file ?
+- 
 
diff --git a/dht.cpp b/dht.cpp
index bf5a678..b76fda7 100644
--- a/dht.cpp
+++ b/dht.cpp
@@ -1,56 +1,80 @@
 //
 //    FILE: dht.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.34
+// VERSION: 0.1.35
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino, AVR optimized
 //     URL: https://github.com/RobTillaart/DHTlib
 //          http://arduino.cc/playground/Main/DHTLib
 //
-// HISTORY:
-// 0.1.34   2021-11-13  fix negative temperature DHT22 again (code from DHTNew)
-// 0.1.33   2021-02-16  fix #6 T-GO signal in handshake. (needed for long wires)
-// 0.1.32   2021-02-01  fix negative temperature DHT22 again (code from DHTNew)
-// 0.1.31   2020-12-15  fix negative temperature DHT22 (code from DHTNew)
-// 0.1.30   2020-06-30  own repo;
-// 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
-// 0.1.25   2017-09-20  FIX https://github.com/RobTillaart/Arduino/issues/80
-// 0.1.24   2017-07-27  FIX https://github.com/RobTillaart/Arduino/issues/33  double -> float
-// 0.1.23   2017-07-24  FIX https://github.com/RobTillaart/Arduino/issues/31
-// 0.1.22   undo delayMicroseconds() for wakeups larger than 8
-// 0.1.21   replace delay with delayMicroseconds() + small fix
-// 0.1.20   Reduce footprint by using uint8_t as error codes. (thanks to chaveiro)
-// 0.1.19   masking error for DHT11 - FIXED (thanks Richard for noticing)
-// 0.1.18   version 1.16/17 broke the DHT11 - FIXED
-// 0.1.17   replaced micros() with adaptive loopcount
-//          removed DHTLIB_INVALID_VALUE
-//          added  DHTLIB_ERROR_CONNECT
-//          added  DHTLIB_ERROR_ACK_L  DHTLIB_ERROR_ACK_H
-// 0.1.16   masking unused bits (less errors); refactored bits[]
-// 0.1.15   reduced # micros calls 2->1 in inner loop.
-// 0.1.14   replace digital read with faster (~3x) code => more robust low MHz machines.
-//          
-// 0.1.13   fix negative temperature
-// 0.1.12   support DHT33 and DHT44 initial version
-// 0.1.11   renamed DHTLIB_TIMEOUT
-// 0.1.10   optimized faster WAKEUP + TIMEOUT
-// 0.1.09   optimize size: timeout check + use of mask
-// 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)
-// 0.1.04   improved readability of code using DHTLIB_OK in code
-// 0.1.03   added error values for temp and humidity when read failed
-// 0.1.02   added error codes
-// 0.1.01   added support for Arduino 1.0, fixed typos (31/12/2011)
-// 0.1.00   by Rob Tillaart (01/04/2011)
+//
+//  HISTORY:
+//  0.1.35   2021-12-16  update library.json, license, #pragma once, 
+//                       move private defines to .cpp file
+//  0.1.34   2021-11-13  fix negative temperature DHT22 again (code from DHTNew)
+//  0.1.33   2021-02-16  fix #6 T-GO signal in handshake. (needed for long wires)
+//  0.1.32   2021-02-01  fix negative temperature DHT22 again (code from DHTNew)
+//  0.1.31   2020-12-15  fix negative temperature DHT22 (code from DHTNew)
+//  0.1.30   2020-06-30  own repo;
+//  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
+//  0.1.25   2017-09-20  FIX https://github.com/RobTillaart/Arduino/issues/80
+//  0.1.24   2017-07-27  FIX https://github.com/RobTillaart/Arduino/issues/33  double -> float
+//  0.1.23   2017-07-24  FIX https://github.com/RobTillaart/Arduino/issues/31
+//  0.1.22   undo delayMicroseconds() for wakeups larger than 8
+//  0.1.21   replace delay with delayMicroseconds() + small fix
+//  0.1.20   Reduce footprint by using uint8_t as error codes. (thanks to chaveiro)
+//  0.1.19   masking error for DHT11 - FIXED (thanks Richard for noticing)
+//  0.1.18   version 1.16/17 broke the DHT11 - FIXED
+//  0.1.17   replaced micros() with adaptive loopcount
+//           removed DHTLIB_INVALID_VALUE
+//           added  DHTLIB_ERROR_CONNECT
+//           added  DHTLIB_ERROR_ACK_L  DHTLIB_ERROR_ACK_H
+//  0.1.16   masking unused bits (less errors); refactored bits[]
+//  0.1.15   reduced # micros calls 2->1 in inner loop.
+//  0.1.14   replace digital read with faster (~3x) code => more robust low MHz machines.
+//           
+//  0.1.13   fix negative temperature
+//  0.1.12   support DHT33 and DHT44 initial version
+//  0.1.11   renamed DHTLIB_TIMEOUT
+//  0.1.10   optimized faster WAKEUP + TIMEOUT
+//  0.1.09   optimize size: timeout check + use of mask
+//  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)
+//  0.1.04   improved readability of code using DHTLIB_OK in code
+//  0.1.03   added error values for temp and humidity when read failed
+//  0.1.02   added error codes
+//  0.1.01   added support for Arduino 1.0, fixed typos (31/12/2011)
+//  0.1.00   by Rob Tillaart (01/04/2011)
 //
 // inspired by DHT11 library
 
+
 #include "dht.h"
 
+
+#define DHTLIB_DHT11_WAKEUP             18
+#define DHTLIB_DHT_WAKEUP               1
+
+#define DHTLIB_DHT11_LEADING_ZEROS      1
+#define DHTLIB_DHT_LEADING_ZEROS        6
+
+
+// max timeout is 100 microseconds.
+// For a 16 MHz processor 100 microseconds is 1600 clock cycles
+// loops using DHTLIB_TIMEOUT use at least 4 clock cycles
+// so 100 us takes max 400 loops
+// so by dividing F_CPU by 40000 we "fail" as fast as possible
+#ifndef F_CPU
+#define DHTLIB_TIMEOUT 1000  // should be approx. clock/40000
+#else
+#define DHTLIB_TIMEOUT (F_CPU/40000)
+#endif
+
+
 /////////////////////////////////////////////////////
 //
 // PUBLIC
@@ -80,6 +104,7 @@ int8_t dht::read11(uint8_t pin)
     return result;
 }
 
+
 int8_t dht::read12(uint8_t pin)
 {
     // READ VALUES
@@ -104,6 +129,7 @@ int8_t dht::read12(uint8_t pin)
     return result;
 }
 
+
 int8_t dht::read(uint8_t pin)
 {
     // READ VALUES
@@ -164,11 +190,11 @@ int8_t dht::read(uint8_t pin)
     return result;
 }
 
+
 /////////////////////////////////////////////////////
 //
 // PRIVATE
 //
-
 int8_t dht::_readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits)
 {
     // INIT BUFFERVAR TO RECEIVE DATA
@@ -273,6 +299,7 @@ int8_t dht::_readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBit
     // digitalWrite(pin, HIGH);
     return DHTLIB_OK;
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/dht.h b/dht.h
index 5657c8c..2094f04 100644
--- a/dht.h
+++ b/dht.h
@@ -1,17 +1,12 @@
+#pragma once
 //
 //    FILE: dht.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.34
+// VERSION: 0.1.35
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino. AVR optimized
 //     URL: https://github.com/RobTillaart/DHTlib
 //          http://arduino.cc/playground/Main/DHTLib
-//
-// HISTORY:
-// see dht.cpp file
-//
 
-#ifndef dht_h
-#define dht_h
 
 #if ARDUINO < 100
 #include <WProgram.h>
@@ -21,7 +16,7 @@
 #endif
 
 
-#define DHT_LIB_VERSION                 (F("0.1.34"))
+#define DHT_LIB_VERSION                 (F("0.1.35"))
 
 #define DHTLIB_OK                       0
 #define DHTLIB_ERROR_CHECKSUM           -1
@@ -30,24 +25,6 @@
 #define DHTLIB_ERROR_ACK_L              -4
 #define DHTLIB_ERROR_ACK_H              -5
 
-#define DHTLIB_DHT11_WAKEUP             18
-#define DHTLIB_DHT_WAKEUP               1
-
-#define DHTLIB_DHT11_LEADING_ZEROS      1
-#define DHTLIB_DHT_LEADING_ZEROS        6
-
-
-// max timeout is 100 usec.
-// For a 16 Mhz proc 100 usec is 1600 clock cycles
-// loops using DHTLIB_TIMEOUT use at least 4 clock cycli
-// so 100 us takes max 400 loops
-// so by dividing F_CPU by 40000 we "fail" as fast as possible
-#ifndef F_CPU
-#define DHTLIB_TIMEOUT 1000  // ahould be approx. clock/40000
-#else
-#define DHTLIB_TIMEOUT (F_CPU/40000)
-#endif
-
 
 class dht
 {
@@ -85,7 +62,7 @@ class dht
     int8_t _readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits);
     bool   _disableIRQ;
 };
-#endif
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht11_test/dht11_test.ino b/examples/dht11_test/dht11_test.ino
index ad9dcdb..fa5c096 100644
--- a/examples/dht11_test/dht11_test.ino
+++ b/examples/dht11_test/dht11_test.ino
@@ -1,17 +1,16 @@
-
 //
 //    FILE: dht11_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.01
 // PURPOSE: DHT library test sketch for DHT11 && Arduino
 //     URL: https://github.com/RobTillaart/DHTlib
-//
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT11_PIN 5
+#define DHT11_PIN     5
+
 
 void setup()
 {
@@ -23,6 +22,7 @@ void setup()
   Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
 }
 
+
 void loop()
 {
   // READ DATA
@@ -31,14 +31,14 @@ void loop()
   switch (chk)
   {
     case DHTLIB_OK:  
-		Serial.print("OK,\t"); 
-		break;
+    Serial.print("OK,\t"); 
+    break;
     case DHTLIB_ERROR_CHECKSUM: 
-		Serial.print("Checksum error,\t"); 
-		break;
+    Serial.print("Checksum error,\t"); 
+    break;
     case DHTLIB_ERROR_TIMEOUT: 
-		Serial.print("Time out error,\t"); 
-		break;
+    Serial.print("Time out error,\t"); 
+    break;
     case DHTLIB_ERROR_CONNECT:
         Serial.print("Connect error,\t");
         break;
@@ -49,8 +49,8 @@ void loop()
         Serial.print("Ack High error,\t");
         break;
     default: 
-		Serial.print("Unknown error,\t"); 
-		break;
+    Serial.print("Unknown error,\t"); 
+    break;
   }
   // DISPLAY DATA
   Serial.print(DHT.humidity, 1);
@@ -59,6 +59,7 @@ void loop()
 
   delay(2000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht12_test/dht12_test.ino b/examples/dht12_test/dht12_test.ino
index 1fa9cd7..b27eb7b 100644
--- a/examples/dht12_test/dht12_test.ino
+++ b/examples/dht12_test/dht12_test.ino
@@ -1,16 +1,16 @@
 //
 //    FILE: dht12_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 // PURPOSE: DHT library test sketch for DHT12 && Arduino
 //     URL: https://github.com/RobTillaart/DHTlib
-//
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT12_PIN 5
+#define DHT12_PIN     5
+
 
 void setup()
 {
@@ -22,6 +22,7 @@ void setup()
   Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
 }
 
+
 void loop()
 {
   // READ DATA
@@ -30,17 +31,17 @@ void loop()
   switch (chk)
   {
     case DHTLIB_OK:  
-		Serial.print("OK,\t"); 
-		break;
+      Serial.print("OK,\t"); 
+    break;
     case DHTLIB_ERROR_CHECKSUM: 
-		Serial.print("Checksum error,\t"); 
-		break;
+      Serial.print("Checksum error,\t"); 
+      break;
     case DHTLIB_ERROR_TIMEOUT: 
-		Serial.print("Time out error,\t"); 
-		break;
+      Serial.print("Time out error,\t"); 
+      break;
     default: 
-		Serial.print("Unknown error,\t"); 
-		break;
+      Serial.print("Unknown error,\t"); 
+      break;
   }
   // DISPLAY DATA
   Serial.print(DHT.humidity, 1);
@@ -49,6 +50,7 @@ void loop()
 
   delay(2000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht21_test/dht21_test.ino b/examples/dht21_test/dht21_test.ino
index f9336a9..bc57ce0 100644
--- a/examples/dht21_test/dht21_test.ino
+++ b/examples/dht21_test/dht21_test.ino
@@ -1,19 +1,16 @@
-
 //
 //    FILE: dht21_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.02
 // PURPOSE: DHT library test sketch for DHT21 && Arduino
 //     URL:
-//
-// Released to the public domain
-//
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT21_PIN 5
+#define DHT21_PIN     5
+
 
 void setup()
 {
@@ -25,6 +22,7 @@ void setup()
     Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
 }
 
+
 void loop()
 {
     // READ DATA
@@ -61,6 +59,7 @@ void loop()
 
     delay(2000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht22_in_function/dht22_in_function.ino b/examples/dht22_in_function/dht22_in_function.ino
index 17c5f5f..6fcbcc1 100644
--- a/examples/dht22_in_function/dht22_in_function.ino
+++ b/examples/dht22_in_function/dht22_in_function.ino
@@ -1,17 +1,17 @@
 //
 //    FILE: dht22_in_function.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 //    DATE: 2021-02-19
 // PURPOSE: show usage of DHT object in a function
+//          based on issue #8
 //     URL: https://github.com/RobTillaart/DHTlib
 
-// based on issue #8
 
 #include "dht.h"
 
 #define DHTPIN 8
 
+
 void printDHT(const uint8_t pin)   // uint8_t is an 8 bit unsigned integer
 {
   // This command questions a DHT22 on a specific 'pin'.
@@ -58,6 +58,7 @@ void printDHT(const uint8_t pin)   // uint8_t is an 8 bit unsigned integer
   }
 }
 
+
 void setup()
 {
   Serial.begin(115200);
@@ -77,4 +78,6 @@ void loop()
   // add your other code here
 }
 
+
 // -- END OF FILE --
+
diff --git a/examples/dht22_test/dht22_test.ino b/examples/dht22_test/dht22_test.ino
index ea44192..77b74d6 100644
--- a/examples/dht22_test/dht22_test.ino
+++ b/examples/dht22_test/dht22_test.ino
@@ -1,22 +1,16 @@
 //
 //    FILE: dht22_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.03
 // PURPOSE: DHT library test sketch for DHT22 && Arduino
 //     URL: https://github.com/RobTillaart/DHTlib
-//
-// HISTORY:
-// 0.1.03 extended stats for all errors
-// 0.1.02 added counters for error-regression testing.
-// 0.1.01
-// 0.1.00 initial version
-//
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT22_PIN 5
+#define DHT22_PIN     5
+
 
 struct
 {
@@ -30,6 +24,7 @@ struct
     uint32_t unknown;
 } stat = { 0,0,0,0,0,0,0,0};
 
+
 void setup()
 {
     Serial.begin(115200);
@@ -40,6 +35,7 @@ void setup()
     Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)");
 }
 
+
 void loop()
 {
     // READ DATA
@@ -111,6 +107,8 @@ void loop()
     }
     delay(2000);
 }
-//
-// END OF FILE
-//
+
+
+// -- END OF FILE --
+
+
diff --git a/examples/dht22_test_noIRQ/dht22_test_noIRQ.ino b/examples/dht22_test_noIRQ/dht22_test_noIRQ.ino
index f952e43..7f7b5cc 100644
--- a/examples/dht22_test_noIRQ/dht22_test_noIRQ.ino
+++ b/examples/dht22_test_noIRQ/dht22_test_noIRQ.ino
@@ -1,14 +1,9 @@
 //
 //    FILE: dht22_test_noIRQ.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 // PURPOSE: DHT library test sketch for DHT22 && Arduino
-//     URL:
-// HISTORY:
-// 0.1.0 initial version
-//
-// Released to the public domain
-//
+//     URL: https://github.com/RobTillaart/DHTlib
+
 
 #include <dht.h>
 
@@ -16,6 +11,7 @@ dht DHT;
 
 #define DHT22_PIN 5
 
+
 struct
 {
     uint32_t total;
@@ -30,6 +26,7 @@ struct
     uint32_t mintime;
 } stat = { 0,0,0,0,0,0,0,0, 0, 9999};
 
+
 void setup()
 {
     Serial.begin(115200);
@@ -37,16 +34,17 @@ void setup()
     Serial.print("LIBRARY VERSION: ");
     Serial.println(DHT_LIB_VERSION);
     Serial.println();
-    
+
     Serial.print("IRQ:\t");
     Serial.println( DHT.getDisableIRQ() );
     DHT.setDisableIRQ(true);
     Serial.print("IRQ:\t");
     Serial.println( DHT.getDisableIRQ() );
-    
+
     Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)");
 }
 
+
 void loop()
 {
     // READ DATA
@@ -125,6 +123,7 @@ void loop()
     }
     delay(500);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht33_test/dht33_test.ino b/examples/dht33_test/dht33_test.ino
index d02198f..f447dd1 100644
--- a/examples/dht33_test/dht33_test.ino
+++ b/examples/dht33_test/dht33_test.ino
@@ -1,18 +1,16 @@
 //
 //    FILE: dht33_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.01
 // PURPOSE: DHT library test sketch for DHT33 && Arduino
-//     URL:
-//
-// Released to the public domain
-//
+//     URL: https://github.com/RobTillaart/DHTlib
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT33_PIN 5
+#define DHT33_PIN     5
+
 
 void setup()
 {
@@ -24,6 +22,7 @@ void setup()
     Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)");
 }
 
+
 void loop()
 {
     // READ DATA
@@ -69,6 +68,7 @@ void loop()
     // ADJUST TO YOUR NEEDS
     delay(1000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht44_test/dht44_test.ino b/examples/dht44_test/dht44_test.ino
index 93db583..5d5f95b 100644
--- a/examples/dht44_test/dht44_test.ino
+++ b/examples/dht44_test/dht44_test.ino
@@ -1,18 +1,16 @@
 //
 //    FILE: dht44_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.01
 // PURPOSE: DHT library test sketch for DHT44 && Arduino
-//     URL:
-//
-// Released to the public domain
-//
+//     URL: https://github.com/RobTillaart/DHTlib
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT44_PIN 5
+#define DHT44_PIN     5
+
 
 void setup()
 {
@@ -24,6 +22,7 @@ void setup()
     Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)\tTime (us)");
 }
 
+
 void loop()
 {
     // READ DATA
@@ -70,6 +69,7 @@ void loop()
 
     delay(1000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
+
diff --git a/examples/dht_test1/dht_test1.ino b/examples/dht_test1/dht_test1.ino
index fc71cf8..5cf8a36 100644
--- a/examples/dht_test1/dht_test1.ino
+++ b/examples/dht_test1/dht_test1.ino
@@ -1,20 +1,19 @@
 //
 //    FILE: dht_test.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.08
 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
+//     URL: https://github.com/RobTillaart/DHTlib
 //     URL: http://arduino.cc/playground/Main/DHTLib
-//
-// Released to the public domain
-//
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT11_PIN 4
-#define DHT21_PIN 5
-#define DHT22_PIN 6
+#define DHT11_PIN       4
+#define DHT21_PIN       5
+#define DHT22_PIN       6
+
 
 void setup()
 {
@@ -26,6 +25,7 @@ void setup()
   Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");
 }
 
+
 void loop()
 {
   // READ DATA
@@ -34,14 +34,14 @@ void loop()
   switch (chk)
   {
     case DHTLIB_OK:  
-		Serial.print("OK,\t"); 
-		break;
+    Serial.print("OK,\t"); 
+    break;
     case DHTLIB_ERROR_CHECKSUM: 
-		Serial.print("Checksum error,\t"); 
-		break;
+    Serial.print("Checksum error,\t"); 
+    break;
     case DHTLIB_ERROR_TIMEOUT: 
-		Serial.print("Time out error,\t"); 
-		break;
+    Serial.print("Time out error,\t"); 
+    break;
     case DHTLIB_ERROR_CONNECT:
         Serial.print("Connect error,\t");
         break;
@@ -52,8 +52,8 @@ void loop()
         Serial.print("Ack High error,\t");
         break;
     default: 
-		Serial.print("Unknown error,\t"); 
-		break;
+    Serial.print("Unknown error,\t"); 
+    break;
   }
   // DISPLAY DATA
   Serial.print(DHT.humidity, 1);
@@ -62,21 +62,20 @@ void loop()
 
   delay(1000);
 
-  
     // READ DATA
   Serial.print("DHT21, \t");
   chk = DHT.read21(DHT21_PIN);
   switch (chk)
   {
     case DHTLIB_OK:  
-		Serial.print("OK,\t"); 
-		break;
+    Serial.print("OK,\t"); 
+    break;
     case DHTLIB_ERROR_CHECKSUM: 
-		Serial.print("Checksum error,\t"); 
-		break;
+    Serial.print("Checksum error,\t"); 
+    break;
     case DHTLIB_ERROR_TIMEOUT: 
-		Serial.print("Time out error,\t"); 
-		break;
+    Serial.print("Time out error,\t"); 
+    break;
     case DHTLIB_ERROR_CONNECT:
         Serial.print("Connect error,\t");
         break;
@@ -87,8 +86,8 @@ void loop()
         Serial.print("Ack High error,\t");
         break;
     default: 
-		Serial.print("Unknown error,\t"); 
-		break;
+    Serial.print("Unknown error,\t"); 
+    break;
   }
   // DISPLAY DATA
   Serial.print(DHT.humidity, 1);
@@ -103,14 +102,14 @@ void loop()
   switch (chk)
   {
     case DHTLIB_OK:  
-		Serial.print("OK,\t"); 
-		break;
+    Serial.print("OK,\t"); 
+    break;
     case DHTLIB_ERROR_CHECKSUM: 
-		Serial.print("Checksum error,\t"); 
-		break;
+    Serial.print("Checksum error,\t"); 
+    break;
     case DHTLIB_ERROR_TIMEOUT: 
-		Serial.print("Time out error,\t"); 
-		break;
+    Serial.print("Time out error,\t"); 
+    break;
     case DHTLIB_ERROR_CONNECT:
         Serial.print("Connect error,\t");
         break;
@@ -121,8 +120,8 @@ void loop()
         Serial.print("Ack High error,\t");
         break;
     default: 
-		Serial.print("Unknown error,\t"); 
-		break;
+    Serial.print("Unknown error,\t"); 
+    break;
   }
  // DISPLAY DATA
   Serial.print(DHT.humidity,1);
@@ -131,6 +130,6 @@ void loop()
 
   delay(1000);
 }
-//
-// END OF FILE
-//
\ No newline at end of file
+
+
+// -- END OF FILE --
diff --git a/examples/dht_tuning/dht_tuning.ino b/examples/dht_tuning/dht_tuning.ino
index 063d5c8..d851f0d 100644
--- a/examples/dht_tuning/dht_tuning.ino
+++ b/examples/dht_tuning/dht_tuning.ino
@@ -1,18 +1,24 @@
 //
 //    FILE: dht_tuning.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.00
 // PURPOSE: DHT test sketch for DHT22 && Arduino => find minimum time between reads
-//     URL:
-//
-// Released to the public domain
-//
+//     URL: https://github.com/RobTillaart/DHTlib
+
 
 #include <dht.h>
 
 dht DHT;
 
-#define DHT22_PIN 2
+#define DHT22_PIN     2
+
+
+int del = 500;
+uint32_t startRead = 0;
+uint32_t stopRead = 0;
+uint32_t startCycle = 0;
+uint32_t stopCycle = 0;
+uint32_t tempCycle = 0;
+
 
 void setup()
 {
@@ -24,12 +30,6 @@ void setup()
   Serial.println("Type,\tstatus,\t\tHumidity (%),\tTemperatur (C),\tT_Read (us)\tT_Cycle (us)\tT_Delay (us)");
 }
 
-int del = 500;
-uint32_t startRead = 0;
-uint32_t stopRead = 0;
-uint32_t startCycle = 0;
-uint32_t stopCycle = 0;
-uint32_t tempCycle = 0;
 
 void loop()
 {
@@ -87,7 +87,7 @@ void loop()
   }
   while(1);
 }
-//
-// END OF FILE
-//
+
+
+// --  END OF FILE --
 
diff --git a/keywords.txt b/keywords.txt
index 79129a2..a1f3790 100644
--- a/keywords.txt
+++ b/keywords.txt
@@ -1,17 +1,11 @@
-#######################################
-# Syntax Coloring Map For DHT
-#######################################
+# Syntax Colouring Map For DHT
 
-#######################################
-# Datatypes (KEYWORD1)
-#######################################
 
+# Data types (KEYWORD1)
 DHT	KEYWORD1
 
-#######################################
-# Methods and Functions (KEYWORD2)
-#######################################
 
+# Methods and Functions (KEYWORD2)
 read	KEYWORD2
 read11	KEYWORD2
 read12	KEYWORD2
@@ -19,20 +13,27 @@ read21	KEYWORD2
 read22	KEYWORD2
 read33	KEYWORD2
 read44	KEYWORD2
+
 read2301	KEYWORD2
 read2302	KEYWORD2
 read2303	KEYWORD2
 read2320	KEYWORD2
 read2322	KEYWORD2
+
 humidity	KEYWORD2
 temperature	KEYWORD2
 
-#######################################
+
 # Instances (KEYWORD2)
-#######################################
 
 
-#######################################
 # Constants (LITERAL1)
-#######################################
+DHT_LIB_VERSION	LITERAL1
+
+DHTLIB_OK	LITERAL1
+DHTLIB_ERROR_CHECKSUM	LITERAL1
+DHTLIB_ERROR_TIMEOUT	LITERAL1
+DHTLIB_ERROR_CONNECT	LITERAL1
+DHTLIB_ERROR_ACK_L	LITERAL1
+DHTLIB_ERROR_ACK_H	LITERAL1
 
diff --git a/library.json b/library.json
index fdf5c9b..71c3154 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "DHTlib",
-  "keywords": "DHT11 DHT22 AM2301 AM2302 AM2303 AM2320 AM2322",
+  "keywords": "DHT11,DHT22,AM2301,AM2302,AM2303,AM2320,AM2322",
   "description": "Optimized Library for DHT Temperature & Humidity Sensor on AVR only.",
   "authors":
   [
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DHTlib.git"
   },
-  "version": "0.1.34",
+  "version": "0.1.35",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*",
diff --git a/library.properties b/library.properties
index 4aa267c..bec98c5 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=DHTlib
-version=0.1.34
+version=0.1.35
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=AVR Optimized Library for DHT Temperature & Humidity Sensor on AVR only.