diff --git a/libraries/DEVRANDOM/.arduino-ci.yml b/libraries/DEVRANDOM/.arduino-ci.yml
index ff5659b9..e7cb4633 100644
--- a/libraries/DEVRANDOM/.arduino-ci.yml
+++ b/libraries/DEVRANDOM/.arduino-ci.yml
@@ -2,6 +2,10 @@ compile:
   # Choosing to run compilation tests on 2 different Arduino platforms
   platforms:
     - uno
-    - leonardo
-    - due
-    - zero
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    # - esp8266
+    # - mega2560
\ No newline at end of file
diff --git a/libraries/DEVRANDOM/.github/workflows/arduino_test_runner.yml b/libraries/DEVRANDOM/.github/workflows/arduino_test_runner.yml
index 476456bb..096b975b 100644
--- a/libraries/DEVRANDOM/.github/workflows/arduino_test_runner.yml
+++ b/libraries/DEVRANDOM/.github/workflows/arduino_test_runner.yml
@@ -4,10 +4,14 @@ name: Arduino CI
 on: [push, pull_request]
 
 jobs:
-  arduino_ci:
+  runTest:
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2
-      - uses: Arduino-CI/action@master
-          #   Arduino-CI/action@v0.1.1
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb
diff --git a/libraries/DEVRANDOM/DEVRANDOM.h b/libraries/DEVRANDOM/DEVRANDOM.h
index d7fa964b..0dffc179 100644
--- a/libraries/DEVRANDOM/DEVRANDOM.h
+++ b/libraries/DEVRANDOM/DEVRANDOM.h
@@ -2,21 +2,22 @@
 //
 //    FILE: DEVRANDOM.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.2
-// PURPOSE: Arduino library for a /dev/random stream - usefull for testing
+// VERSION: 0.1.3
+// PURPOSE: Arduino library for a /dev/random stream - useful for testing
 //     URL: https://github.com/RobTillaart/DEVRANDOM
 //
 //  HISTORY:
 //  0.1.0   2020-06-23  initial version
-//  0.1.1   2020-12-18  add arduino-ci + unit tests
+//  0.1.1   2020-12-18  add Arduino-CI + unit tests
 //                      + getMode() + flush()
 //  0.1.2   2021-01-15  add constructors with seed.
+//  0.1.3   2021-12-15  update library.json, license, minor edits
 
 
 #include "Arduino.h"
 
 
-#define  DEVRANDOM_LIB_VERSION      (F("0.1.2"))
+#define  DEVRANDOM_LIB_VERSION      (F("0.1.3"))
 
 
 #define  DEVRANDOM_MODE_SW           0
@@ -35,6 +36,7 @@ public:
     _pin = 0;
   };
 
+
   DEVRANDOM(const char * str)
   {
     this->print(str);
@@ -43,17 +45,19 @@ public:
     _pin = 0;
   };
 
-  DEVRANDOM(const uint32_t val)
+
+  DEVRANDOM(const uint32_t value)
   {
-     this->print(val);
+     this->print(value);
     _next = random(256);
     _mode = 0;
     _pin = 0;
   };
 
-  DEVRANDOM(const float val)
+
+  DEVRANDOM(const float value)
   {
-    this->print(val, 6);
+    this->print(value, 6);
     _next = random(256);
     _mode = 0;
     _pin = 0;
@@ -64,6 +68,8 @@ public:
 
 
   int peek()      { return _next; };
+
+
   int read()      
   {
     uint8_t x = _next;
@@ -110,29 +116,31 @@ private:
 
   int _hardware()
   {
-    uint8_t val = 0;
+    uint8_t value = 0;
     for (uint8_t i = 0; i < 8; i++)
     {
-      val <<= 1;
-      // TODO register optimized read for speed? ==> Not portable
-      if (digitalRead(_pin)) val++;  
+      value <<= 1;
+      if (digitalRead(_pin)) value++;  
     }
-    return val ^ _seed;
+    return value ^ _seed;
   }
 
 
   int _analog()
   {
-    uint8_t val = 0;
+    uint8_t value = 0;
     for (uint8_t i = 0; i < 8; i++)
     {
-      val <<= 1;
-      if (analogRead(_pin) & 1) val++;
+      value <<= 1;
+      if (analogRead(_pin) & 1) value++;
     }
-    return val ^ _seed;
+    return value ^ _seed;
   }
 };
 
-// TODO alternative random nummer generator so all platforms behave same.
+
+// TODO alternative random number generator so all platforms behave same.
+//      Marsaglia ?
 
 // -- END OF FILE --
+
diff --git a/libraries/DEVRANDOM/LICENSE b/libraries/DEVRANDOM/LICENSE
index 8eba944a..c3d6b3da 100644
--- a/libraries/DEVRANDOM/LICENSE
+++ b/libraries/DEVRANDOM/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020-2021 Rob Tillaart
+Copyright (c) 2020-2022 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/libraries/DEVRANDOM/README.md b/libraries/DEVRANDOM/README.md
index 07e669c9..b1e6f77b 100644
--- a/libraries/DEVRANDOM/README.md
+++ b/libraries/DEVRANDOM/README.md
@@ -1,27 +1,31 @@
 
 [![Arduino CI](https://github.com/RobTillaart/DEVRANDOM/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/DEVRANDOM/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/DEVRANDOM/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/DEVRANDOM/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/DEVRANDOM/actions/workflows/jsoncheck.yml)
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/DEVRANDOM/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/DEVRANDOM.svg?maxAge=3600)](https://github.com/RobTillaart/DEVRANDOM/releases)
 
+
 # DEVRANDOM
 
-Arduino library to wrap a random generator in a stream
+Arduino library to wrap a random generator in a stream.
 
 
 ## Description
 
 The library implements a stream class that mimics the /dev/random
-device of a linux system. It can be used for testing with streams.
+device of a Linux system. It can be used for testing with streams.
 
 
 ## Interface
 
 ### Constructor
 
-- **DEVRANDOM()** Constructor
-- **DEVRANDOM(char \* str)** Constructor
-- **DEVRANDOM(uint32_t val)** Constructor
-- **DEVRANDOM(float val)** Constructor
+- **DEVRANDOM()** Constructor.
+- **DEVRANDOM(char \* str)** Constructor, seeding with a string of characters.
+- **DEVRANDOM(uint32_t value)** Constructor, seeding with a integer value.
+- **DEVRANDOM(float value)** Constructor, seeding with a float value.
+
 
 ### Streeam interface
 
@@ -41,14 +45,14 @@ does have some effect);
 - **useSW()** use a software random number generator. This is the default.
 By default the build-in random number generator is used. 
 This can be replaced by a RNG of your choice. 
-- **useHW(pin)** use digitalRead to read 8 bits from a defined pin.
+- **useHW(uint8_t pin)** use digitalRead to read 8 bits from a defined pin.
 One can build a hardware RNG that flips between 0 and 1 very rapidly and unpredictably.
 Connect this signal to the pin and it will be read and generate a random byte.
 The seed value from the write is used as an XOR byte.
-- **useAR(pin)** use the analogRead to read 8 bits
-This can be fed with an analog noise source.
+- **useAR(uint8_t pin)** use the analogRead to read 8 bits
+This can be fed with an analogue noise source.
 The seed value from the write is used as a XOR byte.
-- **getMode()** returns the source of randomness => 0=SW, 1=HW, 2=AR (see above).
+- **getMode()** returns the source of randomness => 0 = SW, 1 = HW, 2 = AR (see above).
 
 As **write()** reseeds the RNG, printing to **DEVRANDOM** will also reseed the RNG. 
 E.g. **dr.println("Hello world");** would reseed it too.
@@ -72,3 +76,9 @@ As shown in the example one can use fscanf to read larger datatypes,
 However float is not supported standard in the fscanf by UNO and strings (%s) generate garbage.
 So a password generator is a bit more difficult (and a good exercise).
 
+
+## Future
+
+- improve documentation
+- add Marsaglia PRG
+- 
diff --git a/libraries/DEVRANDOM/examples/DEVRANDOM_demo/DEVRANDOM_demo.ino b/libraries/DEVRANDOM/examples/DEVRANDOM_demo/DEVRANDOM_demo.ino
index d924b0c0..f2526db6 100644
--- a/libraries/DEVRANDOM/examples/DEVRANDOM_demo/DEVRANDOM_demo.ino
+++ b/libraries/DEVRANDOM/examples/DEVRANDOM_demo/DEVRANDOM_demo.ino
@@ -7,6 +7,7 @@
 //    (c) : MIT
 //
 
+
 #include "DEVRANDOM.h"
 
 DEVRANDOM dr;
@@ -14,6 +15,7 @@ DEVRANDOM dr;
 uint32_t i = 0, start, stop;
 volatile int x;
 
+
 void setup()
 {
   Serial.begin(115200);
@@ -85,6 +87,7 @@ void setup()
   delay(1000);
 }
 
+
 void loop()
 {
   i++;
@@ -97,4 +100,6 @@ void loop()
   delay(100);
 }
 
-// -- END OF FILE --
\ No newline at end of file
+
+// -- END OF FILE --
+
diff --git a/libraries/DEVRANDOM/examples/DEVRANDOM_password_generator/DEVRANDOM_password_generator.ino b/libraries/DEVRANDOM/examples/DEVRANDOM_password_generator/DEVRANDOM_password_generator.ino
index f8ea790e..39a8f174 100644
--- a/libraries/DEVRANDOM/examples/DEVRANDOM_password_generator/DEVRANDOM_password_generator.ino
+++ b/libraries/DEVRANDOM/examples/DEVRANDOM_password_generator/DEVRANDOM_password_generator.ino
@@ -22,13 +22,15 @@ char pw[PASSWORD_SIZE + 1];
 
 DEVRANDOM dr;
 
-char c1[] = "QWERTYUIOPLMKJNBHGVCFDXSZA";
-char c2[] = "zaqwertyuioplmnbvcxsdfghjk";
-char c3[] = "1598746230";
-char c4[] = "!@#$%^&*()_+-={}|[]\\:;<>?,./";
+// PROGMEM ?
+const char c1[] = "QWERTYUIOPLMKJNBHGVCFDXSZA";
+const char c2[] = "zaqwertyuioplmnbvcxsdfghjk";
+const char c3[] = "1598746230";
+const char c4[] = "!@#$%^&*()_+-={}|[]\\:;<>?,./";
 
 int mx = 0;
 
+
 void setup()
 {
   Serial.begin(115200);
@@ -40,6 +42,7 @@ void setup()
   dr.useSW();  // for proof of concept this is OK
 }
 
+
 void loop()
 {
   Serial.print('\t');
@@ -59,6 +62,7 @@ void loop()
   delay(5);
 }
 
+
 int generatePassword()
 {
   int idx = 0;
@@ -99,4 +103,6 @@ int generatePassword()
   return count;
 }
 
-// -- END OF FILE --
\ No newline at end of file
+
+// -- END OF FILE --
+
diff --git a/libraries/DEVRANDOM/examples/DEVRANDOM_plotter/DEVRANDOM_plotter.ino b/libraries/DEVRANDOM/examples/DEVRANDOM_plotter/DEVRANDOM_plotter.ino
index 7189bd6c..d1950d5b 100644
--- a/libraries/DEVRANDOM/examples/DEVRANDOM_plotter/DEVRANDOM_plotter.ino
+++ b/libraries/DEVRANDOM/examples/DEVRANDOM_plotter/DEVRANDOM_plotter.ino
@@ -9,12 +9,14 @@
 
 // USE WITH SERIAL PLOTTER
 
+
 #include "DEVRANDOM.h"
 
 DEVRANDOM dr;
 
 volatile int x, y, z;
 
+
 void setup()
 {
   Serial.begin(115200);
@@ -24,6 +26,7 @@ void setup()
   Serial.println("SOFTWARE\tDIGITAL\tANALOG");
 }
 
+
 void loop()
 {
   dr.useSW();
@@ -41,4 +44,6 @@ void loop()
   Serial.println();
 }
 
+
 // -- END OF FILE --
+
diff --git a/libraries/DEVRANDOM/keywords.txt b/libraries/DEVRANDOM/keywords.txt
index 4ec15013..93586303 100644
--- a/libraries/DEVRANDOM/keywords.txt
+++ b/libraries/DEVRANDOM/keywords.txt
@@ -1,16 +1,24 @@
-# Syntax Coloring Map For DEVRANDOM
+# Syntax Colouring Map For DEVRANDOM
 
-# Datatypes (KEYWORD1)
+
+# Data types (KEYWORD1)
 DEVRANDOM	KEYWORD1
 
+
 # Methods and Functions (KEYWORD2)
 useAR	KEYWORD2
 useHW	KEYWORD2
 useSW	KEYWORD2
 getMode	KEYWORD2
 
+
 # Instances (KEYWORD2)
 
+
 # Constants (LITERAL1)
+#DEVRANDOM_LIB_VERSION	LITERAL1
 
+DEVRANDOM_MODE_SW	LITERAL1
+DEVRANDOM_MODE_HW	LITERAL1
+DEVRANDOM_MODE_AR	LITERAL1
 
diff --git a/libraries/DEVRANDOM/library.json b/libraries/DEVRANDOM/library.json
index 24937439..ddeb5d3b 100644
--- a/libraries/DEVRANDOM/library.json
+++ b/libraries/DEVRANDOM/library.json
@@ -15,8 +15,9 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/DEVRANDOM.git"
   },
-  "version": "0.1.2",
+  "version": "0.1.3",
   "license": "MIT",
   "frameworks": "arduino",
-  "platforms": "*"
+  "platforms": "*",
+  "headers": "DEVRANDOM.h"
 }
diff --git a/libraries/DEVRANDOM/library.properties b/libraries/DEVRANDOM/library.properties
index 72e8fe04..4a4cfda2 100644
--- a/libraries/DEVRANDOM/library.properties
+++ b/libraries/DEVRANDOM/library.properties
@@ -1,5 +1,5 @@
 name=DEVRANDOM
-version=0.1.2
+version=0.1.3
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library to wrap a random generator in a stream
diff --git a/libraries/DEVRANDOM/test/unit_test_001.cpp b/libraries/DEVRANDOM/test/unit_test_001.cpp
index 0b5781e9..931def55 100644
--- a/libraries/DEVRANDOM/test/unit_test_001.cpp
+++ b/libraries/DEVRANDOM/test/unit_test_001.cpp
@@ -29,6 +29,7 @@
 
 unittest_setup()
 {
+  fprintf(stderr, "DEVRANDOM_LIB_VERSION: %s\n", (char *) DEVRANDOM_LIB_VERSION);
 }
 
 
@@ -37,10 +38,16 @@ unittest_teardown()
 }
 
 
+unittest(test_constants)
+{
+  assertEqual(0, DEVRANDOM_MODE_SW);
+  assertEqual(1, DEVRANDOM_MODE_HW);
+  assertEqual(2, DEVRANDOM_MODE_AR);
+}
+
+
 unittest(test_constructor)
 {
-  fprintf(stderr, "VERSION: %s\n", DEVRANDOM_LIB_VERSION);
-
   DEVRANDOM dr;
   
   assertEqual(DEVRANDOM_MODE_SW, dr.getMode());