diff --git a/libraries/shiftOutSlow/.arduino-ci.yml b/libraries/shiftOutSlow/.arduino-ci.yml
new file mode 100644
index 000000000..ff5659b91
--- /dev/null
+++ b/libraries/shiftOutSlow/.arduino-ci.yml
@@ -0,0 +1,7 @@
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    - leonardo
+    - due
+    - zero
diff --git a/libraries/shiftOutSlow/.github/workflows/arduino-lint.yml b/libraries/shiftOutSlow/.github/workflows/arduino-lint.yml
new file mode 100644
index 000000000..b2ca058c1
--- /dev/null
+++ b/libraries/shiftOutSlow/.github/workflows/arduino-lint.yml
@@ -0,0 +1,13 @@
+
+name: Arduino-lint
+
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: update
+          compliance: strict
diff --git a/libraries/shiftOutSlow/.github/workflows/arduino_test_runner.yml b/libraries/shiftOutSlow/.github/workflows/arduino_test_runner.yml
new file mode 100644
index 000000000..476456bb8
--- /dev/null
+++ b/libraries/shiftOutSlow/.github/workflows/arduino_test_runner.yml
@@ -0,0 +1,13 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  arduino_ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: Arduino-CI/action@master
+          #   Arduino-CI/action@v0.1.1
diff --git a/libraries/shiftOutSlow/.github/workflows/jsoncheck.yml b/libraries/shiftOutSlow/.github/workflows/jsoncheck.yml
new file mode 100644
index 000000000..04603d081
--- /dev/null
+++ b/libraries/shiftOutSlow/.github/workflows/jsoncheck.yml
@@ -0,0 +1,18 @@
+name: JSON check
+
+on:
+  push:
+    paths:
+      - '**.json'
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v1
+        with:
+          pattern: "\\.json$"
+
diff --git a/libraries/shiftOutSlow/LICENSE b/libraries/shiftOutSlow/LICENSE
new file mode 100644
index 000000000..a8b455d01
--- /dev/null
+++ b/libraries/shiftOutSlow/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021-2021 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
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/libraries/shiftOutSlow/README.md b/libraries/shiftOutSlow/README.md
new file mode 100644
index 000000000..323fe6ee9
--- /dev/null
+++ b/libraries/shiftOutSlow/README.md
@@ -0,0 +1,51 @@
+
+[![Arduino CI](https://github.com/RobTillaart/ShiftOutSlow/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/ShiftOutSlow/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/ShiftOutSlow.svg?maxAge=3600)](https://github.com/RobTillaart/ShiftOutSlow/releases)
+
+# ShiftOutSlow
+
+Arduino library for shiftOut with build-in delay - e.g. for 74HC595
+
+A library for shiftInSlow also exist.
+
+## Description
+
+
+ShiftOutSlow is an experimental library that has a build in delay (in microseconds) that allows tuning the time per bit. 
+This allows one to improve reliability e.g. when using longer lines.
+
+The datapin and clockpin are set in the constructor, the delay is settable per byte send to be able to optimize runtime.
+
+ShiftOutSlow implements the print interface.
+
+
+## Performance
+
+The performance of **write()** with a delay of 0 microseconds is slower than the default Arduino 
+**shiftOut()** due to some overhead. 
+
+The delay requested is split in two (expect rounding errors) to have "nice" looking pulses.
+
+
+## Interface
+
+The interface exists of the following functions:
+- **ShiftOutSlow(datapin, clockpin, bitorder = LSBFIRST)** constructor.
+- **size_t write(uint8_t data)** writes a new value
+- **uint8_t lastWritten()** returns last value written
+- **void setDelay(uint16_t microseconds)** set delay per bit from 0 .. 65535 microseconds.
+- **uint16_t getDelay()** returns the set delay in microseconds.
+- **bool setBitOrder(bitOrder)** set LSBFIRST or MSBFIRST. Returns false for other values.
+- **uint8_t getBitOrder(void)** returns LSBFIRST or MSBFIRST
+
+
+## Notes
+
+- to be tested
+
+
+## Operation
+
+See examples
+
diff --git a/libraries/shiftOutSlow/ShiftOutSlow.cpp b/libraries/shiftOutSlow/ShiftOutSlow.cpp
new file mode 100644
index 000000000..95b03e668
--- /dev/null
+++ b/libraries/shiftOutSlow/ShiftOutSlow.cpp
@@ -0,0 +1,59 @@
+//
+//    FILE: ShiftOutSlow.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: Arduino library for shiftOut with build-in delay
+//    DATE: 2021-05-11
+//     URL: https://github.com/RobTillaart/ShiftOutSlow
+
+
+#include "ShiftOutSlow.h"
+
+
+ShiftOutSlow::ShiftOutSlow(const uint8_t dataPin, const uint8_t clockPin, const uint8_t bitOrder)
+{
+  _clockPin = clockPin;
+  _dataPin = dataPin;
+  _bitOrder = bitOrder;
+  _value    = 0;
+  pinMode(_dataPin, OUTPUT);
+  pinMode(_clockPin, OUTPUT);
+  // https://www.arduino.cc/reference/en/language/functions/advanced-io/shiftin/
+  digitalWrite(_clockPin, LOW);  // assume rising pulses from clock 
+}
+
+
+size_t ShiftOutSlow::write(const uint8_t data)
+{
+  uint8_t val = data;
+  for (uint8_t i = 0; i < 8; ++i)
+  {
+    if (_delay > 0) delayMicroseconds(_delay/2);
+    if (_bitOrder == LSBFIRST) {
+      digitalWrite(_dataPin, val & 0x01);
+      val >>= 1;
+    } else {
+      digitalWrite(_dataPin, (val & 0x80) != 0);
+      val <<= 1;
+    }
+    digitalWrite(_clockPin, HIGH);
+    if (_delay > 0) delayMicroseconds(_delay/2);
+    yield();
+    digitalWrite(_clockPin, LOW);
+  }
+  _value = data;
+  return 1;
+}
+
+
+bool ShiftOutSlow::setBitOrder(const uint8_t bitOrder)
+{
+  if ((bitOrder == LSBFIRST) || (bitOrder == MSBFIRST))
+  {
+    _bitOrder = bitOrder; 
+    return true;
+  };
+  return false;
+}
+
+// -- END OF FILE --
diff --git a/libraries/shiftOutSlow/ShiftOutSlow.h b/libraries/shiftOutSlow/ShiftOutSlow.h
new file mode 100644
index 000000000..2716da330
--- /dev/null
+++ b/libraries/shiftOutSlow/ShiftOutSlow.h
@@ -0,0 +1,42 @@
+#pragma once
+//
+//    FILE: ShiftOutSlow.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: Arduino library for shiftOut with build-in delay
+//    DATE: 2021-05-11
+//     URL: https://github.com/RobTillaart/ShiftOutSlow
+//
+
+
+#include "Arduino.h"
+
+
+#define SHIFTOUTSLOW_LIB_VERSION (F("0.1.0"))
+
+
+class ShiftOutSlow : public Print
+{
+public:
+  // bitorder = { LSBFIRST, MSBFIRST };
+  ShiftOutSlow(const uint8_t dataPin, const uint8_t clockPin, const uint8_t  bitOrder = LSBFIRST);
+
+  size_t   write(const uint8_t data);
+  uint8_t  lastWritten(void) { return _value; };
+
+  bool     setBitOrder(const uint8_t bitOrder);
+  uint8_t  getBitOrder(void) { return _bitOrder; };
+  
+  void     setDelay(uint16_t d) { _delay = d; };
+  uint16_t getDelay() { return _delay; };
+
+
+private:
+  uint8_t  _clockPin = 0  ;
+  uint8_t  _dataPin  = 0;
+  uint8_t  _bitOrder = LSBFIRST;
+  uint16_t _delay    = 0;
+  uint8_t  _value    = 0;
+};
+
+// -- END OF FILE --
diff --git a/libraries/shiftOutSlow/examples/shiftOutSlow_demo/shiftOutSlow_demo.ino b/libraries/shiftOutSlow/examples/shiftOutSlow_demo/shiftOutSlow_demo.ino
new file mode 100644
index 000000000..797a3dc84
--- /dev/null
+++ b/libraries/shiftOutSlow/examples/shiftOutSlow_demo/shiftOutSlow_demo.ino
@@ -0,0 +1,42 @@
+//
+//    FILE: shiftOutSlow_demo.ino
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: test sketch
+//     URL: https://github.com/RobTillaart/ShiftOutSlow
+//
+
+
+#include "ShiftOutSlow.h"
+
+
+ShiftOutSlow SOS(12, 13, LSBFIRST);
+
+volatile int x = 0;
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__); 
+  Serial.println(SHIFTOUTSLOW_LIB_VERSION);
+
+  for (uint16_t d = 0; d < 1000; d += 10)
+  {
+    SOS.setDelay(d);
+    uint32_t start = micros();
+    x = SOS.write(0x55);
+    uint32_t stop = micros();
+    float duration = stop - start;
+    Serial.print(stop - start);
+    Serial.print("\t");
+    Serial.println(duration / 8, 1);
+  }
+
+  Serial.println("done...");
+}
+
+void loop()
+{
+}
+
+// -- END OF FILE --
diff --git a/libraries/shiftOutSlow/keywords.txt b/libraries/shiftOutSlow/keywords.txt
new file mode 100644
index 000000000..4d303d1cb
--- /dev/null
+++ b/libraries/shiftOutSlow/keywords.txt
@@ -0,0 +1,18 @@
+# Syntax Coloring Map For ShiftOutSlow
+
+# Datatypes (KEYWORD1)
+ShiftOutSlow	KEYWORD1
+
+
+# Methods and Functions (KEYWORD2)
+read	KEYWORD2
+lastRead	KEYWORD2
+setBitOrder	KEYWORD2
+getBitOrder	KEYWORD2
+setDelay	KEYWORD2
+getDelay	KEYWORD2
+
+
+# Constants (LITERAL1)
+SHIFTOUTSLOW_LIB_VERSION	LITERAL1
+
diff --git a/libraries/shiftOutSlow/library.json b/libraries/shiftOutSlow/library.json
new file mode 100644
index 000000000..3293a2e90
--- /dev/null
+++ b/libraries/shiftOutSlow/library.json
@@ -0,0 +1,22 @@
+{
+  "name": "ShiftOutSlow",
+  "keywords": "Shift, shiftOut, out, serial, slow, 74HC595",
+  "description": "Arduino library for shiftOut with build-in delay - e.g. for 74HC595",
+  "authors":
+  [
+    {
+      "name": "Rob Tillaart",
+      "email": "Rob.Tillaart@gmail.com",
+      "maintainer": true
+    }
+  ],
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/RobTillaart/ShiftOutSlow.git"
+  },
+  "version": "0.1.0",
+  "license": "MIT",
+  "frameworks": "arduino",
+  "platforms": "*"
+}
diff --git a/libraries/shiftOutSlow/library.properties b/libraries/shiftOutSlow/library.properties
new file mode 100644
index 000000000..e2b54a7d7
--- /dev/null
+++ b/libraries/shiftOutSlow/library.properties
@@ -0,0 +1,11 @@
+name=ShiftOutSlow
+version=0.1.0
+author=Rob Tillaart <rob.tillaart@gmail.com>
+maintainer=Rob Tillaart <rob.tillaart@gmail.com>
+sentence=Arduino library for shiftOut with build-in delay - e.g. for 74HC165
+paragraph=
+category=Signal Input/Output
+url=https://github.com/RobTillaart/ShiftOutSlow
+architectures=*
+includes=ShiftOutSlow.h
+depends=
diff --git a/libraries/shiftOutSlow/test/unit_test_001.cpp b/libraries/shiftOutSlow/test/unit_test_001.cpp
new file mode 100644
index 000000000..28d7fe616
--- /dev/null
+++ b/libraries/shiftOutSlow/test/unit_test_001.cpp
@@ -0,0 +1,103 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2021-05-11
+// PURPOSE: unit tests for the FastShiftIn library
+//          https://github.com/RobTillaart/ShiftOutSlow
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// https://github.com/Arduino-CI/arduino_ci/blob/master/cpp/unittest/Assertion.h#L33-L42
+// ----------------------------
+// assertEqual(expected, actual)
+// assertNotEqual(expected, actual)
+// assertLess(expected, actual)
+// assertMore(expected, actual)
+// assertLessOrEqual(expected, actual)
+// assertMoreOrEqual(expected, actual)
+// assertTrue(actual)
+// assertFalse(actual)
+// assertNull(actual)
+// assertNotNull(actual)
+
+#include <ArduinoUnitTests.h>
+
+
+#include "Arduino.h"
+#include "ShiftOutSlow.h"
+
+
+// PATCH FOR DUE & ZERO FOR UNIT TEST - https://github.com/Arduino-CI/arduino_ci/issues/252
+#if defined(ARDUINO_ARCH_SAM) || defined(ARDUINO_ARCH_SAMD)
+// - due         #  ARDUINO_ARCH_SAM    does not support shiftIn apparently
+// - zero        #  ARDUINO_ARCH_SAMD   
+#endif
+
+
+unittest_setup()
+{
+}
+
+unittest_teardown()
+{
+}
+
+
+unittest(test_constructor)
+{
+  ShiftOutSlow SOS(12, 13);
+
+  fprintf(stderr, "VERSION:\t%s\n", SHIFTOUTSLOW_LIB_VERSION);
+  assertEqual(1, SOS.write(65));
+  assertEqual(65, SOS.lastWritten());
+  assertEqual(LSBFIRST, SOS.getBitOrder());
+  
+  SOS.setBitOrder(MSBFIRST);
+  assertEqual(MSBFIRST, SOS.getBitOrder());
+}
+
+
+unittest(test_constructor_LSB)
+{
+  ShiftOutSlow SOS(12, 13, LSBFIRST);
+
+  fprintf(stderr, "VERSION:\t%s\n", SHIFTOUTSLOW_LIB_VERSION);
+  assertEqual(1, SOS.write(65));
+  assertEqual(65, SOS.lastWritten());
+  assertEqual(LSBFIRST, SOS.getBitOrder());
+  
+  SOS.setBitOrder(MSBFIRST);
+  assertEqual(MSBFIRST, SOS.getBitOrder());
+}
+
+
+unittest(test_constructor_MSB)
+{
+  ShiftOutSlow SOS(12, 13, MSBFIRST);
+
+  fprintf(stderr, "VERSION:\t%s\n", SHIFTOUTSLOW_LIB_VERSION);
+  assertEqual(1, SOS.write(65));
+  assertEqual(65, SOS.lastWritten());
+  assertEqual(MSBFIRST, SOS.getBitOrder());
+  
+  SOS.setBitOrder(LSBFIRST);
+  assertEqual(LSBFIRST, SOS.getBitOrder());
+}
+
+
+unittest(test_setDelay)
+{
+  ShiftOutSlow SOS(12, 13);
+
+  fprintf(stderr, "VERSION:\t%s\n", SHIFTOUTSLOW_LIB_VERSION);
+  for (uint16_t d = 0; d < 1000; d += 100)
+  {
+    SOS.setDelay(d);
+    assertEqual(d, SOS.getDelay());
+  }
+}
+
+unittest_main()
+
+// --------