diff --git a/libraries/HeartBeat/.arduino-ci.yml b/libraries/HeartBeat/.arduino-ci.yml
index ff5659b9..cecf5850 100644
--- a/libraries/HeartBeat/.arduino-ci.yml
+++ b/libraries/HeartBeat/.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
diff --git a/libraries/HeartBeat/.github/workflows/arduino_test_runner.yml b/libraries/HeartBeat/.github/workflows/arduino_test_runner.yml
index 476456bb..096b975b 100644
--- a/libraries/HeartBeat/.github/workflows/arduino_test_runner.yml
+++ b/libraries/HeartBeat/.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/HeartBeat/HeartBeat.cpp b/libraries/HeartBeat/HeartBeat.cpp
index c98c7f68..a6bfa3cd 100644
--- a/libraries/HeartBeat/HeartBeat.cpp
+++ b/libraries/HeartBeat/HeartBeat.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: HeartBeat.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.3
+// VERSION: 0.2.0
 // PURPOSE: Arduino library for HeartBeat with frequency and dutyCycle
 //    DATE: 2019-06-12
 //     URL: https://github.com/RobTillaart/HeartBeat
@@ -12,6 +12,10 @@
 //  0.1.2   2021-01-15  renamed all to HeartBeat
 //                      added dutyCycle
 //  0.1.3   2021-05-27  fix arduino-lint
+//  0.2.0   2021-11-02  update Build-CI, add badges
+//                      add getFrequency(), getDutyCycle();
+//                      add getState().
+//                      removed set()
 
 
 #include "HeartBeat.h"
@@ -19,7 +23,6 @@
 
 HeartBeat::HeartBeat()
 {
-  _dutyCycle = 50;
 }
 
 
@@ -35,14 +38,15 @@ void HeartBeat::begin(const uint8_t pin, float frequency)
 
 void HeartBeat::setFrequency(float frequency)
 {
-  _frequency = abs(frequency);
+  _frequency = frequency;
+  if (_frequency < 0) _frequency = -frequency;
+  if (_frequency < 0.001) _frequency = 0.001;
   _setFreqDuty();
 }
 
 
 void HeartBeat::setDutyCycle(float dutyCycle)
 {
-  
   _dutyCycle = constrain(dutyCycle, 0, 100);  // percentage
   _setFreqDuty();
 }
@@ -50,29 +54,28 @@ void HeartBeat::setDutyCycle(float dutyCycle)
 
 void HeartBeat::beat()
 {
-  static uint8_t state = LOW;
   if (_running == false) 
   {
-    state = LOW;
+    _state = LOW;
   }
   else
   {
     uint32_t now = micros();
-    if ((state == LOW)  && (now - _lastHeartBeat) < _dutyCycleLow)  return;
-    if ((state == HIGH) && (now - _lastHeartBeat) < _dutyCycleHigh) return;
+    if ((_state == LOW)  && (now - _lastHeartBeat) < _dutyCycleLow)  return;
+    if ((_state == HIGH) && (now - _lastHeartBeat) < _dutyCycleHigh) return;
     _lastHeartBeat = now;
-    state = !state;
+    _state = !_state;
   }
-  digitalWrite(_pin, state);
+  digitalWrite(_pin, _state);
 }
 
 
 /////////////////////////////////
-
-
+//
+//  PRIVATE
+//
 void HeartBeat::_setFreqDuty()
 {
-  _lastHeartBeat = 0;
   float time = 10000.0/_frequency;
   _dutyCycleHigh = round(_dutyCycle * time);
   _dutyCycleLow  = round((100 - _dutyCycle) * time);
@@ -80,3 +83,4 @@ void HeartBeat::_setFreqDuty()
 
 
 // -- END OF FILE --
+
diff --git a/libraries/HeartBeat/HeartBeat.h b/libraries/HeartBeat/HeartBeat.h
index 37762642..a3a7218b 100644
--- a/libraries/HeartBeat/HeartBeat.h
+++ b/libraries/HeartBeat/HeartBeat.h
@@ -2,7 +2,7 @@
 //
 //    FILE: HeartBeat.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.3
+// VERSION: 0.2.0
 // PURPOSE: Arduino library for HeartBeat with frequency and dutyCycle
 //    DATE: 2019-06-12
 //     URL: https://github.com/RobTillaart/HeartBeat
@@ -10,34 +10,40 @@
 
 #include "Arduino.h"
 
-#define HEARTBEAT_LIB_VERSION       (F("0.1.3"))
+#define HEARTBEAT_LIB_VERSION       (F("0.2.0"))
+
 
 class HeartBeat
 {
 public:
   HeartBeat();
 
-  void  begin(const uint8_t pin, float frequency = 1.0);
-  void  setFrequency(float frequency = 1.0);
-  void  setDutyCycle(float dutyCycle = 50);
+  void   begin(const uint8_t pin, float frequency = 1.0);
+  
+  void   setFrequency(float frequency = 1.0);
+  void   setDutyCycle(float dutyCycle = 50);
+  float  getFrequency() { return _frequency; };
+  float  getDutyCycle() { return _dutyCycle; };
 
   inline void enable()  { _running = true;  };
   inline void disable() { _running = false; };
 
-  void  beat();
-
-  // OBSOLETE in next release
-  void  set(float frequency = 1.0) { setFrequency(frequency); };
+  void    beat();
+  uint8_t getState()    { return _state; };
 
 protected:
   void     _setFreqDuty();
-  float    _frequency;
-  float    _dutyCycle;
-  uint32_t _lastHeartBeat;
-  uint32_t _dutyCycleHigh;
-  uint32_t _dutyCycleLow;
-  bool     _running;
-  uint8_t  _pin;
+
+  float    _frequency      = 1.0;
+  float    _dutyCycle      = 50;
+
+  uint32_t _lastHeartBeat  = 0;
+  uint32_t _dutyCycleHigh  = 500;
+  uint32_t _dutyCycleLow   = 500;
+
+  bool     _running        = false;
+  uint8_t  _pin            = 255;
+  uint8_t  _state          = LOW;
 };
 
 
diff --git a/libraries/HeartBeat/README.md b/libraries/HeartBeat/README.md
index 33dae985..497e9e40 100644
--- a/libraries/HeartBeat/README.md
+++ b/libraries/HeartBeat/README.md
@@ -1,18 +1,20 @@
 
 [![Arduino CI](https://github.com/RobTillaart/HeartBeat/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/HeartBeat/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/HeartBeat/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/HeartBeat/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/HeartBeat/actions/workflows/jsoncheck.yml)
 [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/HeartBeat/blob/master/LICENSE)
 [![GitHub release](https://img.shields.io/github/release/RobTillaart/HeartBeat.svg?maxAge=3600)](https://github.com/RobTillaart/HeartBeat/releases)
 
 
 # HeartBeat
 
-Arduino library for a HeartBeat with frequency and dutycycle
+Arduino library for a HeartBeat with frequency and duty cycle.
 
 
 ## Description
 
-The hearbeat library offers a simple HeartBeat by sending pulses to
-a digital pin. Typical usage is to blink a (built in) LED as indicater 
+The heartbeat library offers a simple HeartBeat by sending pulses to 
+a digital pin. Typical usage is to blink a (built in) LED as indicator 
 a program is still alive.
 
 The library uses no hardware timer and is based upon micros() so the user 
@@ -24,35 +26,39 @@ can be used as a first level debugging tool. Different frequencies can indicate
 a different state of the program or a different level of some sensor.
 No heart beat indicates the program is stuck or blocked.
 
-The current version does not allow to differ the ON and OFF time,
-this might be an option in a future version.
-
 For more complex patterns, please check my pulsePattern library.
 
 
 ## Interface
 
-The interface consists of a small set of 
+The interface consists of the following functions:
 
 - **HeartBeat()** constructor
-- **begin(uint8_t pin, float freq)**  to configure the HeartBeat. 
+- **void begin(uint8_t pin, float frequency)** to configure the HeartBeat. 
 The default frequency is 1.0
-- **setFrequency(float freq)** change the frequency of the pulsing.  
-Will not enable or disable the HeartBeat. Must be > 0.0
-- **setDutyCycle(float dutyCycle = 50)** duty cycle in percentage time HIGH.
-Must be between 0.00 and 100.0.
-- **enable()** enable the pulsing
-- **disable()** disable the pulsing; will switch of the LED.
-- **beat()** the worker; this function checks if the HeartBeat is enabled 
+- **void setFrequency(float frequency)** change the frequency of the pulsing.  
+Will not enable or disable the HeartBeat.  
+Must be > 0.001 otherwise it will be constrained to 0.001.
+On the upper side values beyond 10 Hz are hard for humans but are allowed.
+- **void setDutyCycle(float dutyCycle = 50)** duty cycle in percentage time HIGH.
+Must be between 0.00 and 100.0.  A value of 0 will put the heartbeat effectively off.
+- **float getFrequency()** returns set frequency (or constrained value).
+- **float getDutyCycle()** returns set duty cycle (or constrained value).
+- **void enable()** enable the pulsing.
+- **void disable()** disable the pulsing; will switch of the LED.
+- **void beat()** the worker; this function checks if the HeartBeat is enabled 
 and the LED  must be toggled.  
 It must be called as often as possible to keep a steady pace,
 at least 4 times the given frequency.  
-Not calling **beat()** effectively stops the hearbeat.
+Not calling **beat()** effectively stops the heartbeat.
+- **uint8_t getState()** returns the state of the heartbeat.
+Useful for debugging.
 
 
 #### Obsolete
 
-- **set(float freq)** Will become obsolete, use **setFrequency()** instead.
+- **set(float freq)** is replaced by **setFrequency()**.
+
 
 ## Applications
 
@@ -62,13 +68,22 @@ Applications include but are not limited to
   - 1 Hz = OK
   - 2 Hz = Warning
   - 5 Hz = Error
-- indicate power usage by increasing HeartBeat e.g. round(amps) 
-- indicate sound volume by increasing HeartBeat
-- indicate changing distant by hearbeat
-- geiger counter style.
+  - no signal would indicate also an error.
+- indicate power e.g. round(amps) - you might need to map the range!
+- indicate the volume by increasing heartBeat
+- indicate a changing distant - increasing or decreasing.
+- Geiger counter style.
 
 
 ## Operation
 
 See examples
 
+
+## Future
+
+- differentiate between ON / OFF time
+- improve documentation
+- add examples
+- 
+
diff --git a/libraries/HeartBeat/examples/HearBeat_dutyCycle/HearBeat_dutyCycle.ino b/libraries/HeartBeat/examples/HearBeat_dutyCycle/HearBeat_dutyCycle.ino
index 1b8c7ddc..70538f23 100644
--- a/libraries/HeartBeat/examples/HearBeat_dutyCycle/HearBeat_dutyCycle.ino
+++ b/libraries/HeartBeat/examples/HearBeat_dutyCycle/HearBeat_dutyCycle.ino
@@ -16,8 +16,13 @@ void setup()
   Serial.println(__FILE__);
   Serial.println(HEARTBEAT_LIB_VERSION);
 
-  HB.begin(13, 3);        // PIN 13 with frequency 3
-  HB.setDutyCycle(10.0);  // 10% time high
+  HB.begin(13, 3);          // PIN 13 with frequency 3
+  HB.setDutyCycle(17.53);
+
+  Serial.print("FR: ");
+  Serial.println(HB.getFrequency());
+  Serial.print("DC: ");
+  Serial.println(HB.getDutyCycle());
 }
 
 
diff --git a/libraries/HeartBeat/examples/arrayHeartBeat/arrayHeartBeat.ino b/libraries/HeartBeat/examples/arrayHeartBeat/arrayHeartBeat.ino
index 706631c7..c3401555 100644
--- a/libraries/HeartBeat/examples/arrayHeartBeat/arrayHeartBeat.ino
+++ b/libraries/HeartBeat/examples/arrayHeartBeat/arrayHeartBeat.ino
@@ -19,6 +19,9 @@ void setup()
   HB[0].begin(11, 1);
   HB[1].begin(12, 3);
   HB[2].begin(13, 5);
+  HB[0].setDutyCycle(20);
+  HB[1].setDutyCycle(30);
+  HB[2].setDutyCycle(40);
 }
 
 
diff --git a/libraries/HeartBeat/examples/randomHeartBeat/randomHeartBeat.ino b/libraries/HeartBeat/examples/randomHeartBeat/randomHeartBeat.ino
index 3052f38f..2aee9ee3 100644
--- a/libraries/HeartBeat/examples/randomHeartBeat/randomHeartBeat.ino
+++ b/libraries/HeartBeat/examples/randomHeartBeat/randomHeartBeat.ino
@@ -31,7 +31,7 @@ void loop()
   {
     lastUpdate = millis();
     float f = 1.0 + 0.1 * random(50);
-    HB.set(f);
+    HB.setFrequency(f);
   }
   
   // do other stuff here
diff --git a/libraries/HeartBeat/examples/sinusHeartBeat/sinusHeartBeat.ino b/libraries/HeartBeat/examples/sinusHeartBeat/sinusHeartBeat.ino
index 48a229e5..ffaef152 100644
--- a/libraries/HeartBeat/examples/sinusHeartBeat/sinusHeartBeat.ino
+++ b/libraries/HeartBeat/examples/sinusHeartBeat/sinusHeartBeat.ino
@@ -9,8 +9,6 @@
 
 HeartBeat HB;
 
-int frequency = 1;
-
 
 void setup() 
 {
@@ -18,7 +16,7 @@ void setup()
   Serial.println(__FILE__);
   Serial.println(HEARTBEAT_LIB_VERSION);
 
-  HB.begin(13, frequency);
+  HB.begin(13, 1.0);
 }
 
 
@@ -26,9 +24,9 @@ void loop()
 {
   HB.beat();
 
-  float f = 5 * (1 + sin(millis()/10000));
-  HB.set(f);
-  
+  float frequency = 5 * (1 + sin(millis()/1000.0));
+  HB.setFrequency(frequency);
+  // Serial.println(frequency, 6);
   // do other stuff here
 }
 
diff --git a/libraries/HeartBeat/keywords.txt b/libraries/HeartBeat/keywords.txt
index 5fc23a29..d7c9dea5 100644
--- a/libraries/HeartBeat/keywords.txt
+++ b/libraries/HeartBeat/keywords.txt
@@ -1,6 +1,6 @@
-# Syntax Coloring Map For HeartBeat
+# Syntax Colouring Map For HeartBeat
 
-# Datatypes (KEYWORD1)
+# Data types (KEYWORD1)
 HeartBeat	KEYWORD1
 
 
@@ -8,6 +8,8 @@ HeartBeat	KEYWORD1
 begin	KEYWORD2
 setFrequency	KEYWORD2
 setDutyCycle	KEYWORD2
+getFrequency	KEYWORD2
+getDutyCycle	KEYWORD2
 enable	KEYWORD2
 disable	KEYWORD2
 beat	KEYWORD2
diff --git a/libraries/HeartBeat/library.json b/libraries/HeartBeat/library.json
index ded2559b..030ca258 100644
--- a/libraries/HeartBeat/library.json
+++ b/libraries/HeartBeat/library.json
@@ -1,7 +1,7 @@
 {
   "name": "HeartBeat",
   "keywords": "HeartBeat, blinking led, polling",
-  "description": "Arduino library for HeartBeat with frequency and dutyCycle.",
+  "description": "Arduino library for HeartBeat with frequency and duty cycle.",
   "authors":
   [
     {
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/HeartBeat.git"
   },
-  "version": "0.1.3",
+  "version": "0.2.0",
   "license": "MIT",
   "frameworks": "arduino",
   "platforms": "*"
diff --git a/libraries/HeartBeat/library.properties b/libraries/HeartBeat/library.properties
index 98905af1..b5ec7934 100644
--- a/libraries/HeartBeat/library.properties
+++ b/libraries/HeartBeat/library.properties
@@ -1,8 +1,8 @@
 name=HeartBeat
-version=0.1.3
+version=0.2.0
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
-sentence=Arduino library for HeartBeat with frequency and dutyCycle.
+sentence=Arduino library for HeartBeat with frequency and duty cycle.
 paragraph=blinking led by frequent polling.
 category=Other
 url=https://github.com/RobTillaart/HeartBeat
diff --git a/libraries/HeartBeat/test/unit_test_001.cpp b/libraries/HeartBeat/test/unit_test_001.cpp
index 6c489895..98313d2d 100644
--- a/libraries/HeartBeat/test/unit_test_001.cpp
+++ b/libraries/HeartBeat/test/unit_test_001.cpp
@@ -49,7 +49,7 @@ unittest_teardown()
 
 unittest(test_constructor)
 {
-  fprintf(stderr, "VERSION: %s\n", HEARTBEAT_LIB_VERSION );
+  fprintf(stderr, "VERSION: %s\n", (char *) HEARTBEAT_LIB_VERSION );
 
   GodmodeState* state = GODMODE();
   state->reset();
@@ -79,6 +79,32 @@ unittest(test_constructor)
 }
 
 
+unittest(test_frequency)
+{
+  HeartBeat HB;
+  HB.begin(13, 4);
+  
+  assertEqualFloat(4, HB.getFrequency(), 0.001);
+  for (int fr = 1; fr < 10; fr++)
+  {
+    HB.setFrequency(fr);
+    assertEqualFloat(fr, HB.getFrequency(), 0.001);
+  }
+}
+
+
+unittest(test_dutycycle)
+{
+  HeartBeat HB;
+  HB.begin(13, 1);
+
+  for (int dc = 10; dc < 101; dc += 10)
+  {
+    HB.setDutyCycle(dc);
+    assertEqualFloat(dc, HB.getDutyCycle(), 0.001);
+  }
+}
+
 unittest_main()
 
 // --------