diff --git a/libraries/I2C_SCANNER/.arduino-ci.yml b/libraries/I2C_SCANNER/.arduino-ci.yml
new file mode 100644
index 00000000..3115dcd5
--- /dev/null
+++ b/libraries/I2C_SCANNER/.arduino-ci.yml
@@ -0,0 +1,11 @@
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    - esp8266
+    # - mega2560
\ No newline at end of file
diff --git a/libraries/I2C_SCANNER/.github/FUNDING.yml b/libraries/I2C_SCANNER/.github/FUNDING.yml
new file mode 100644
index 00000000..90d9ab4c
--- /dev/null
+++ b/libraries/I2C_SCANNER/.github/FUNDING.yml
@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: RobTillaart
+
diff --git a/libraries/I2C_SCANNER/.github/workflows/arduino-lint.yml b/libraries/I2C_SCANNER/.github/workflows/arduino-lint.yml
new file mode 100644
index 00000000..b2ca058c
--- /dev/null
+++ b/libraries/I2C_SCANNER/.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/I2C_SCANNER/.github/workflows/arduino_test_runner.yml b/libraries/I2C_SCANNER/.github/workflows/arduino_test_runner.yml
new file mode 100644
index 00000000..096b975b
--- /dev/null
+++ b/libraries/I2C_SCANNER/.github/workflows/arduino_test_runner.yml
@@ -0,0 +1,17 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  runTest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb
diff --git a/libraries/I2C_SCANNER/.github/workflows/jsoncheck.yml b/libraries/I2C_SCANNER/.github/workflows/jsoncheck.yml
new file mode 100644
index 00000000..04603d08
--- /dev/null
+++ b/libraries/I2C_SCANNER/.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/I2C_SCANNER/I2C_SCANNER.cpp b/libraries/I2C_SCANNER/I2C_SCANNER.cpp
new file mode 100644
index 00000000..7c012bad
--- /dev/null
+++ b/libraries/I2C_SCANNER/I2C_SCANNER.cpp
@@ -0,0 +1,56 @@
+//
+//    FILE: I2C_SCANNER.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2022-08-29
+// PURPOSE: I2C scanner class
+//
+
+#include "I2C_SCANNER.h"
+
+
+
+I2C_SCANNER::I2C_SCANNER(TwoWire *wire)
+{
+  _wire = wire;
+}
+
+
+#if defined (ESP8266) || defined(ESP32)
+bool I2C_SCANNER::begin(int dataPin, int clockPin)
+{
+  _wire = &Wire;
+  if ((dataPin < 255) && (clockPin < 255))
+  {
+    _wire->begin(dataPin, clockPin);
+  } else {
+    _wire->begin();
+  }
+  return true;
+}
+#endif
+
+
+bool I2C_SCANNER::begin()
+{
+  _wire->begin();
+  return true;
+}
+
+
+bool I2C_SCANNER::ping(uint8_t address)
+{
+  _wire->beginTransmission(address);
+  return ( _wire->endTransmission() == 0);
+}
+
+
+bool I2C_SCANNER::setClock(uint32_t clockFrequency)
+{
+  _wire->setClock(clockFrequency);
+  return true;
+}
+
+
+// -- END OF FILE --
+
diff --git a/libraries/I2C_SCANNER/I2C_SCANNER.h b/libraries/I2C_SCANNER/I2C_SCANNER.h
new file mode 100644
index 00000000..55698a69
--- /dev/null
+++ b/libraries/I2C_SCANNER/I2C_SCANNER.h
@@ -0,0 +1,54 @@
+#pragma once
+//
+//    FILE: I2C_SCANNER.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2022-08-29
+// PURPOSE: I2C scanner class
+//
+
+#include "Arduino.h"
+#include "Wire.h"
+
+#define I2C_SCANNER_LIB_VERSION        (F("0.1.0"))
+
+
+class I2C_SCANNER
+{
+  public:
+  
+  I2C_SCANNER(TwoWire *wire = &Wire);
+  
+#if defined (ESP8266) || defined(ESP32)
+  bool    begin(int sda, int scl);
+#endif
+  bool    begin();
+
+  bool    ping(uint8_t address);
+
+  bool    setClock(uint32_t clockFrequency = 100000UL);
+
+
+
+  private:
+    uint8_t   _devices[16];  //  cache ?
+    TwoWire*  _wire;
+
+};
+
+
+/*
+ * ideas 
+ *
+- set Wire
+- detect Wirecount
+
+- set output stream
+
+- set speed, re
+- 
+
+*/
+
+// -- END OF FILE --
+
diff --git a/libraries/I2C_SCANNER/LICENSE b/libraries/I2C_SCANNER/LICENSE
new file mode 100644
index 00000000..cb502675
--- /dev/null
+++ b/libraries/I2C_SCANNER/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022-2022 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
+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/I2C_SCANNER/README.md b/libraries/I2C_SCANNER/README.md
new file mode 100644
index 00000000..1c86a757
--- /dev/null
+++ b/libraries/I2C_SCANNER/README.md
@@ -0,0 +1,45 @@
+
+[![Arduino CI](https://github.com/RobTillaart/I2C_SCANNER/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/I2C_SCANNER/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/I2C_SCANNER/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/I2C_SCANNER/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/I2C_SCANNER/actions/workflows/jsoncheck.yml)
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/I2C_SCANNER/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/I2C_SCANNER.svg?maxAge=3600)](https://github.com/RobTillaart/I2C_SCANNER/releases)
+
+
+# I2C_SCANNER
+
+Arduino class to implement an I2C scanner.
+
+
+## Description
+
+I2C_SCANNER is a class to build an I2C scanner, either minimal or more complex.
+
+Goal is to rebuild my multispeed_I2C_scanner with this class.
+
+
+## Interface
+
+TODO
+
+
+## Operation
+
+See examples.
+
+
+## Future
+
+
+#### Must
+
+- implement functionality
+- build examples.
+
+
+#### Should
+
+- unit tests
+- documentation
+- Add all stuff needed. 
+
diff --git a/libraries/I2C_SCANNER/examples/I2C_scanner_minimal/I2C_scanner_minimal.ino b/libraries/I2C_SCANNER/examples/I2C_scanner_minimal/I2C_scanner_minimal.ino
new file mode 100644
index 00000000..411c5e28
--- /dev/null
+++ b/libraries/I2C_SCANNER/examples/I2C_scanner_minimal/I2C_scanner_minimal.ino
@@ -0,0 +1,35 @@
+//    FILE: I2C_scanner_minimal.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo minimal I2C scanner
+//     URL: https://github.com/RobTillaart/I2C_SCANNER
+
+
+#include "I2C_SCANNER.h"
+
+I2C_SCANNER scanner;
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("I2C_SCANNER_LIB_VERSION: ");
+  Serial.println(I2C_SCANNER_LIB_VERSION);
+
+  scanner.begin();
+
+  for (int addr = 0; addr < 128; addr++)
+  {
+    Serial.print(addr);
+    Serial.print("\t");
+    Serial.println(scanner.ping(addr));
+  }
+}
+
+void loop()
+{
+}
+
+// -- END OF FILE --
+
diff --git a/libraries/I2C_SCANNER/examples/I2C_scanner_simple/I2C_scanner_simple.ino b/libraries/I2C_SCANNER/examples/I2C_scanner_simple/I2C_scanner_simple.ino
new file mode 100644
index 00000000..f0958f8c
--- /dev/null
+++ b/libraries/I2C_SCANNER/examples/I2C_scanner_simple/I2C_scanner_simple.ino
@@ -0,0 +1,45 @@
+//    FILE: I2C_scanner_simple.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo simple scanner
+//     URL: https://github.com/RobTillaart/I2C_SCANNER
+
+
+#include "I2C_SCANNER.h"
+
+I2C_SCANNER scanner;
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("I2C_SCANNER_LIB_VERSION: ");
+  Serial.println(I2C_SCANNER_LIB_VERSION);
+
+  scanner.begin();
+
+  for (int addr = 0; addr < 128; addr++)
+  {
+    if (addr % 8 == 0) Serial.println();
+    if (scanner.ping(addr))
+    {
+      Serial.print(addr);
+    }
+    else
+    {
+      Serial.print("-");
+    }
+    Serial.print("\t");
+  }
+  Serial.println();
+  Serial.println();
+}
+
+void loop()
+{
+
+
+}
+
+// -- END OF FILE --
diff --git a/libraries/I2C_SCANNER/keywords.txt b/libraries/I2C_SCANNER/keywords.txt
new file mode 100644
index 00000000..e9d2a095
--- /dev/null
+++ b/libraries/I2C_SCANNER/keywords.txt
@@ -0,0 +1,14 @@
+# Syntax Colouring Map For I2C_SCANNER
+
+# Data types (KEYWORD1)
+I2C_SCANNER	KEYWORD1
+
+# Methods and Functions (KEYWORD2)
+begin	KEYWORD2
+ping	KEYWORD2
+setClock	KEYWORD2
+
+
+# Constants (LITERAL1)
+I2C_SCANNER_LIB_VERSION	LITERAL1
+
diff --git a/libraries/I2C_SCANNER/library.json b/libraries/I2C_SCANNER/library.json
new file mode 100644
index 00000000..f11bb198
--- /dev/null
+++ b/libraries/I2C_SCANNER/library.json
@@ -0,0 +1,23 @@
+{
+  "name": "I2C_SCANNER",
+  "keywords": "I2C,scanner",
+  "description": "Arduino class to implement an I2C scanner.",
+  "authors":
+  [
+    {
+      "name": "Rob Tillaart",
+      "email": "Rob.Tillaart@gmail.com",
+      "maintainer": true
+    }
+  ],
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/RobTillaart/I2C_SCANNER.git"
+  },
+  "version": "0.1.0",
+  "license": "MIT",
+  "frameworks": "arduino",
+  "platforms": "*",
+  "headers": "I2C_SCANNER.h"
+}
diff --git a/libraries/I2C_SCANNER/library.properties b/libraries/I2C_SCANNER/library.properties
new file mode 100644
index 00000000..adc06727
--- /dev/null
+++ b/libraries/I2C_SCANNER/library.properties
@@ -0,0 +1,11 @@
+name=I2C_SCANNER
+version=0.1.0
+author=Rob Tillaart <rob.tillaart@gmail.com>
+maintainer=Rob Tillaart <rob.tillaart@gmail.com>
+sentence=Arduino class to implement an I2C scanner.
+paragraph=.
+category=Other
+url=https://github.com/RobTillaart/I2C_SCANNER
+architectures=*
+includes=I2C_SCANNER.h
+depends=
diff --git a/libraries/I2C_SCANNER/test/unit_test_001.cpp b/libraries/I2C_SCANNER/test/unit_test_001.cpp
new file mode 100644
index 00000000..0097dc7a
--- /dev/null
+++ b/libraries/I2C_SCANNER/test/unit_test_001.cpp
@@ -0,0 +1,53 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2022-08-29
+// PURPOSE: unit tests for the I2C_SCANNER class
+//          https://github.com/RobTillaart/I2C_SCANNER
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// ----------------------------
+// assertEqual(expected, actual)
+// assertNotEqual(expected, actual)
+// assertLess(expected, actual)
+// assertMore(expected, actual)
+// assertLessOrEqual(expected, actual)
+// assertMoreOrEqual(expected, actual)
+// assertTrue(actual)
+// assertFalse(actual)
+// assertNull(actual)
+
+
+#include <ArduinoUnitTests.h>
+
+#include "Arduino.h"
+#include "I2C_SCANNER.h"
+
+#define A0      0
+
+
+unittest_setup()
+{
+    fprintf(stderr, "I2C_SCANNER_LIB_VERSION: %s\n", (char *) I2C_SCANNER_LIB_VERSION);
+}
+
+unittest_teardown()
+{
+}
+
+
+unittest(test_constructor)
+{
+  I2C_SCANNER scanner;
+  scanner.begin();
+  
+  assertEqual(1, 1); //  keep build-CI happy
+}
+
+
+unittest_main()
+
+
+// -- END OF FILE --