diff --git a/libraries/ADC08XS/.arduino-ci.yml b/libraries/ADC08XS/.arduino-ci.yml
new file mode 100644
index 00000000..b4ab412d
--- /dev/null
+++ b/libraries/ADC08XS/.arduino-ci.yml
@@ -0,0 +1,27 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    - esp8266
+    # - mega2560
+    - rpipico
diff --git a/libraries/ADC08XS/.github/FUNDING.yml b/libraries/ADC08XS/.github/FUNDING.yml
new file mode 100644
index 00000000..90d9ab4c
--- /dev/null
+++ b/libraries/ADC08XS/.github/FUNDING.yml
@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: RobTillaart
+
diff --git a/libraries/ADC08XS/.github/workflows/arduino-lint.yml b/libraries/ADC08XS/.github/workflows/arduino-lint.yml
new file mode 100644
index 00000000..8a26f14a
--- /dev/null
+++ b/libraries/ADC08XS/.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@v3
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: update
+          compliance: strict
diff --git a/libraries/ADC08XS/.github/workflows/arduino_test_runner.yml b/libraries/ADC08XS/.github/workflows/arduino_test_runner.yml
new file mode 100644
index 00000000..fadfa904
--- /dev/null
+++ b/libraries/ADC08XS/.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@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb
diff --git a/libraries/ADC08XS/.github/workflows/jsoncheck.yml b/libraries/ADC08XS/.github/workflows/jsoncheck.yml
new file mode 100644
index 00000000..37a11298
--- /dev/null
+++ b/libraries/ADC08XS/.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@v3
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v1
+        with:
+          pattern: "\\.json$"
+
diff --git a/libraries/ADC08XS/ADC08XS.cpp b/libraries/ADC08XS/ADC08XS.cpp
new file mode 100644
index 00000000..de266b03
--- /dev/null
+++ b/libraries/ADC08XS/ADC08XS.cpp
@@ -0,0 +1,334 @@
+//
+//    FILE: ADC08XS.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2024-01-13
+// PURPOSE: Arduino library for ADC082S, ADC084S, ADC102S, ADC104S, ADC122S, ADC124S, 
+//                              8, 10, 12 bits, 2 or 4 channel ADC (SPI).
+//     URL: https://github.com/RobTillaart/ADC08XS
+
+
+#include "ADC08XS.h"
+
+
+//       HARDWARE SPI
+ADC08XS::ADC08XS(__SPI_CLASS__ * mySPI)
+{
+  _dataIn     = 255;
+  _dataOut    = 255;
+  _clock      = 255;
+  _select     = 255;
+  _hwSPI      = true;
+  _mySPI      = mySPI;
+  _maxValue   = 255;
+  _isLowPower = false;
+  _maxChannel = 2;
+}
+
+
+//       SOFTWARE SPI
+ADC08XS::ADC08XS(uint8_t dataIn, uint8_t dataOut, uint8_t clock)
+{
+  _dataIn     = dataIn;
+  _dataOut    = dataOut;
+  _clock      = clock;
+  _select     = 255;
+  _hwSPI      = false;
+  _mySPI      = NULL;
+  _maxValue   = 255;
+  _isLowPower = false;
+  _maxChannel = 2;
+}
+
+
+void ADC08XS::begin(uint8_t select)
+{
+  _select = select;
+  pinMode(_select, OUTPUT);
+  digitalWrite(_select, HIGH);
+  digitalWrite(_select, LOW);
+  digitalWrite(_select, HIGH);
+
+  _spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
+
+  if (_hwSPI)          //  hardware SPI
+  {
+    _mySPI->end();
+    _mySPI->begin();
+  }
+  else                 //  software SPI
+  {
+    pinMode(_dataIn, INPUT);
+    pinMode(_dataOut, OUTPUT);
+    pinMode(_clock,  OUTPUT);
+    digitalWrite(_dataOut, LOW);
+    digitalWrite(_clock,   HIGH);
+  }
+}
+
+
+uint16_t ADC08XS::maxValue()
+{
+  return _maxValue;
+}
+
+
+uint8_t ADC08XS::maxChannel()
+{
+  return _maxChannel;
+}
+
+
+uint32_t ADC08XS::count()
+{
+  return _count;
+}
+
+
+uint16_t ADC08XS::read(uint8_t channel)
+{
+  return readADC(channel) >> 4;  //  remove 4 trailing zero's
+}
+
+
+void ADC08XS::setSPIspeed(uint32_t speed)
+{
+  _SPIspeed = speed;
+  _spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
+}
+
+
+uint32_t ADC08XS::getSPIspeed()
+{
+  return _SPIspeed;
+}
+
+
+bool ADC08XS::usesHWSPI()
+{
+  return _hwSPI;
+}
+
+
+void ADC08XS::lowPower()
+{
+  _isLowPower = true;
+  shutDown();
+}
+
+
+void ADC08XS::wakeUp()
+{
+  readADC(0);
+  _isLowPower = false;
+}
+
+
+bool ADC08XS::isLowPower()
+{
+  return _isLowPower;
+}
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+//  PROTECTED
+//
+uint16_t ADC08XS::readADC(uint8_t channel)
+{
+  if (channel >= _maxChannel) return 0;
+
+  _count++;
+
+  uint16_t address = channel << 11;
+  uint16_t data = 0;
+
+  digitalWrite(_select, LOW);
+  if (_hwSPI)  //  hardware SPI
+  {
+    _mySPI->beginTransaction(_spi_settings);
+     data = _mySPI->transfer16(address);
+    _mySPI->endTransaction();
+  }
+  else  //  Software SPI
+  {
+     data = swSPI_transfer16(address);
+  }
+  digitalWrite(_select, HIGH);
+
+  return data;
+}
+
+
+void ADC08XS::shutDown()
+{
+  digitalWrite(_select, LOW);
+  if (_hwSPI)  //  hardware SPI
+  {
+    _mySPI->beginTransaction(_spi_settings);
+    _mySPI->transfer(0);        //  8 pulses 
+    _mySPI->endTransaction();
+  }
+  else  //  Software SPI
+  {
+     swSPI_transfer16(0, 0x0010);  //  4 pulses is enough
+  }
+  digitalWrite(_select, HIGH);
+}
+
+
+//  MSBFIRST
+uint16_t  ADC08XS::swSPI_transfer16(uint16_t address, uint16_t m)
+{
+  uint8_t clk = _clock;
+  uint8_t dai = _dataIn;
+  uint8_t dao = _dataOut;
+  uint16_t addr = address;
+
+  uint16_t rv = 0;
+  for (uint16_t mask = m; mask; mask >>= 1)
+  {
+    digitalWrite(dao, (addr & mask));
+    digitalWrite(clk, LOW);
+    digitalWrite(clk, HIGH);
+    if (digitalRead(dai) == HIGH) rv |= mask;
+  }
+  return rv;
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC082S
+//
+ADC082S::ADC082S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 255;
+  _maxChannel = 2;
+}
+
+ADC082S::ADC082S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 255;
+  _maxChannel = 2;
+}
+
+uint16_t ADC082S::read(uint8_t channel)
+{
+  return readADC(channel) >> 4;  //  remove 4 trailing zero's
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC084S
+//
+ADC084S::ADC084S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 255;
+  _maxChannel = 4;
+}
+
+ADC084S::ADC084S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 255;
+  _maxChannel = 4;
+}
+
+uint16_t ADC084S::read(uint8_t channel)
+{
+  return readADC(channel) >> 4;  //  remove 4 trailing zero's
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC102S
+//
+ADC102S::ADC102S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 1023;
+  _maxChannel = 2;
+}
+
+ADC102S::ADC102S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 1023;
+  _maxChannel = 2;
+}
+
+uint16_t ADC102S::read(uint8_t channel)
+{
+  return readADC(channel) >> 2;  //  remove 2 trailing zero's
+}
+
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC104S
+//
+ADC104S::ADC104S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 1023;
+  _maxChannel = 4;
+}
+
+ADC104S::ADC104S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 1023;
+  _maxChannel = 4;
+}
+
+uint16_t ADC104S::read(uint8_t channel)
+{
+  return readADC(channel) >> 2;  //  remove 2 trailing zero's
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC122S
+//
+ADC122S::ADC122S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 4095;
+  _maxChannel = 2;
+}
+
+ADC122S::ADC122S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 4095;
+  _maxChannel = 2;
+}
+
+uint16_t ADC122S::read(uint8_t channel)
+{
+  return readADC(channel);
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASS ADC124S
+//
+ADC124S::ADC124S(__SPI_CLASS__ * mySPI) : ADC08XS(mySPI)
+{
+  _maxValue = 4095;
+  _maxChannel = 4;
+}
+
+ADC124S::ADC124S(uint8_t dataIn, uint8_t dataOut, uint8_t clock) : ADC08XS(dataIn, dataOut, clock)
+{
+  _maxValue = 4095;
+  _maxChannel = 4;
+}
+
+uint16_t ADC124S::read(uint8_t channel)
+{
+  return readADC(channel);
+}
+
+
+//  -- END OF FILE --
+
diff --git a/libraries/ADC08XS/ADC08XS.h b/libraries/ADC08XS/ADC08XS.h
new file mode 100644
index 00000000..9cd08ca8
--- /dev/null
+++ b/libraries/ADC08XS/ADC08XS.h
@@ -0,0 +1,142 @@
+#pragma once
+//
+//    FILE: ADC08XS.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+//    DATE: 2024-01-13
+// PURPOSE: Arduino library for ADC082S, ADC084S, ADC102S, ADC104S, ADC122S, ADC124S, 
+//                              8, 10, 12 bits, 2 or 4 channel ADC (SPI).
+//     URL: https://github.com/RobTillaart/ADC08XS
+//
+
+
+#include "Arduino.h"
+#include "SPI.h"
+
+
+#define ADC08XS_LIB_VERSION       (F("0.1.0"))
+
+
+#ifndef __SPI_CLASS__
+  #if defined(ARDUINO_ARCH_RP2040)
+  #define __SPI_CLASS__   SPIClassRP2040
+  #else
+  #define __SPI_CLASS__   SPIClass
+  #endif
+#endif
+
+
+class ADC08XS
+{
+public:
+  //       HARDWARE SPI
+  ADC08XS(__SPI_CLASS__ * mySPI = &SPI);
+  //       SOFTWARE SPI
+  ADC08XS(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+
+  void     begin(uint8_t select);
+
+  uint16_t maxValue();
+  uint8_t  maxChannel();
+  uint16_t read(uint8_t channel);
+
+  //       speed in Hz
+  void     setSPIspeed(uint32_t speed);
+  uint32_t getSPIspeed();
+
+  //       debugging
+  bool     usesHWSPI();
+  uint32_t count();  //  number of channels read.
+
+  void     lowPower();
+  void     wakeUp();
+  bool     isLowPower();
+
+protected:
+  uint8_t  _dataIn;
+  uint8_t  _dataOut;
+  uint8_t  _clock;
+  uint8_t  _select;
+  bool     _hwSPI;
+
+  uint16_t _maxValue;
+  uint8_t  _maxChannel;
+  uint16_t readADC(uint8_t channel);
+  void     shutDown();
+
+  uint16_t swSPI_transfer16(uint16_t address, uint16_t m = 0x8000);
+
+  //  1 MHz is a safe value (datasheet); in a test 4 MHz worked.
+  uint32_t        _SPIspeed = 1000000;
+  __SPI_CLASS__ * _mySPI;
+  SPISettings     _spi_settings;
+
+  uint32_t _count;
+  bool     _isLowPower;
+};
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASSES 2 channel
+//
+class ADC082S : public ADC08XS
+{
+public:
+  ADC082S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC082S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+class ADC102S : public ADC08XS
+{
+public:
+  ADC102S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC102S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+class ADC122S : public ADC08XS
+{
+public:
+  ADC122S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC122S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//  DERIVED CLASSES 4 channel
+//
+class ADC084S : public ADC08XS
+{
+public:
+  ADC084S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC084S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+class ADC104S : public ADC08XS
+{
+public:
+  ADC104S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC104S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+class ADC124S : public ADC08XS
+{
+public:
+  ADC124S(__SPI_CLASS__ * mySPI = &SPI);
+  ADC124S(uint8_t dataIn, uint8_t dataOut, uint8_t clock);
+  uint16_t read(uint8_t channel);
+};
+
+
+//  -- END OF FILE --
+
diff --git a/libraries/ADC08XS/CHANGELOG.md b/libraries/ADC08XS/CHANGELOG.md
new file mode 100644
index 00000000..6dd6c6ea
--- /dev/null
+++ b/libraries/ADC08XS/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Change Log ADC08XS
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.1.0] - 2024-01-13
+- initial version.
+
diff --git a/libraries/ADC08XS/LICENSE b/libraries/ADC08XS/LICENSE
new file mode 100644
index 00000000..37fe70e5
--- /dev/null
+++ b/libraries/ADC08XS/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024-2024 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/ADC08XS/README.md b/libraries/ADC08XS/README.md
new file mode 100644
index 00000000..39247063
--- /dev/null
+++ b/libraries/ADC08XS/README.md
@@ -0,0 +1,180 @@
+
+[![Arduino CI](https://github.com/RobTillaart/ADC08XS/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/ADC08XS/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/ADC08XS/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/ADC08XS/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/ADC08XS/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/ADC08XS.svg)](https://github.com/RobTillaart/ADC08XS/issues)
+
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/ADC08XS/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/ADC08XS.svg?maxAge=3600)](https://github.com/RobTillaart/ADC08XS/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/ADC08XS.svg)](https://registry.platformio.org/libraries/robtillaart/ADC08XS)
+
+
+# ADC08XS
+
+Arduino library for ADC082S, ADC084S, ADC102S, ADC104S, ADC122S, ADC124S, 8, 10, 12 bits, 2 or 4 channel ADC (SPI).
+
+
+## Description
+
+Experimental.
+
+This library provides six classes,
+- dual channel: ADC082S, ADC102S and ADC122S.
+- quad channel: ADC084S, ADC104S and ADC124S.
+
+These are respectively an 8 bit, a 10 bit and a 12 bit ADC convertor.
+The library supports both hardware and software SPI.
+The interface is straightforward as one only need a **read()** call
+to get the data.
+
+This library does not support the single channel versions.
+- See https://github.com/RobTillaart/ADC081S
+
+The library does not support the I2C versions of these devices.
+These can be recognized from the C as ADCxxxC
+
+The library can put the device in **lowPower()** and needs a call to
+**wakeUp()** to wake up. Alternative way to wake up the device is to
+do a dummy **read()**.
+
+The library is not tested with hardware yet.
+
+Feedback is as always welcome.
+
+
+#### Performance
+
+Although the ADC08XS is rated at 200 KSPS and higher, an Arduino UNO will not
+be able to fetch that much samples from the device. 
+The reason is that an UNO cannot fetch the bits fast enough from the device.
+At maximum SPI speed of 8 MHz one will get at most 50 KSPS. 
+
+For the faster ones, see below, at 1 MSPS one need a clock of at least 16 MHz
++ time to process the incoming data. 
+A faster processor like an ESP32 or Teensy might do the job.
+
+Investigations should be made for a sort of continuous mode.
+This would have the CS line constantly LOW and be able to read from the same
+address over and over.
+
+To be tested, feedback welcome.
+
+
+#### Compatibles
+
+There are 18 (multi channel) device types in this series, which can be used
+with the six classes of this library.
+
+|  device name  |  channels  |  bits  |  KSPS  |  Class    |  Notes  |
+|:--------------|:----------:|:------:|:------:|:---------:|:-------:|
+|  ADC082S021   |     2      |   8    |   200  |  ADC082S  |
+|  ADC082S051   |     2      |   8    |   500  |  ADC082S  |
+|  ADC082S101   |     2      |   8    |  1000  |  ADC082S  |
+|  ADC102S021   |     2      |   10   |   200  |  ADC102S  |
+|  ADC102S051   |     2      |   10   |   500  |  ADC102S  |
+|  ADC102S101   |     2      |   10   |  1000  |  ADC102S  |
+|  ADC122S021   |     2      |   12   |   200  |  ADC122S  |
+|  ADC122S051   |     2      |   12   |   500  |  ADC122S  |
+|  ADC122S101   |     2      |   12   |  1000  |  ADC122S  |
+|  ADC084S021   |     4      |   8    |   200  |  ADC084S  |
+|  ADC084S051   |     4      |   8    |   500  |  ADC084S  |
+|  ADC084S101   |     4      |   8    |  1000  |  ADC084S  |
+|  ADC104S021   |     4      |   10   |   200  |  ADC104S  |
+|  ADC104S051   |     4      |   10   |   500  |  ADC104S  |
+|  ADC104S101   |     4      |   10   |  1000  |  ADC104S  |
+|  ADC124S021   |     4      |   12   |   200  |  ADC124S  |
+|  ADC124S051   |     4      |   12   |   500  |  ADC124S  |
+|  ADC124S101   |     4      |   12   |  1000  |  ADC124S  |
+
+Type = ADC(bits)(channel)(protocol)(speed)1 
+e.g ADC082S021 = 8 bits 2 channel SPI 200000
+S == SPI.C == I2C.
+
+
+#### Related
+
+- https://github.com/RobTillaart/ADC081S  single channel version of this series.
+- https://gammon.com.au/adc  tutorial about ADC's (UNO specific)
+- https://github.com/RobTillaart/MCP_ADC
+- https://github.com/RobTillaart/ADS1x15  (12 & 16 bit ADC, I2C, slow)
+- https://github.com/RobTillaart/PCF8591  (8 bit ADC + 1 bit DAC)
+- https://github.com/RobTillaart/MCP_DAC
+
+
+## Interface
+
+```cpp
+#include "ADC08XS_MC.h"
+```
+
+#### Constructors
+
+All six classes have identical interfaces as the ADC082S.
+
+- **ADC082S_MC(SPIClassRP2040 \* mySPI = &SPI)** hardware constructor RP2040
+- **ADC082S_MC(SPIClass \* mySPI = &SPI)** hardware constructor other
+- **ADC082S_MC(uint8_t dataIn, uint8_t dataOut, uint8_t clock)**
+- **void begin(uint8_t select)** set SELECT or CS pin.
+- **int16_t maxValue()** returns maxReading of ADC, => 255, 1023, 4095
+depending on number of bits / class.
+- **uint8_t maxChannel()** returns 2 or 4 depending on the class.
+
+
+#### Base
+
+- **uint16_t read(uint8_t channel)** reads the value of the device.
+The parameter channel must be 0,1,2,3, depending on device.
+Invalid channels will always return zero 0.
+- **void setSPIspeed(uint32_t speed)** sets SPI clock in **Hz**, please read datasheet
+of the ADC first to get optimal speed.
+- **uint32_t getSPIspeed()** returns current speed in **Hz**.
+
+
+#### Low power
+
+- **void lowPower()** put device in low power mode.
+- **void wakeUp()** put device in normal power mode.
+- **isLowPower()** returns true if in low power mode, so wakeUp needed().
+
+Alternative way to wake up the device is to
+do a dummy **read()**.
+
+
+#### Debug
+
+- **bool usesHWSPI()** returns true if hardware SPI is used.
+- **uint32_t count()** returns number of reads since start.
+
+
+## Future
+
+#### Must
+
+- improve documentation
+- get hardware to test / verify working
+- align with ADC081S where possible
+
+#### Should
+
+- investigate continuous read 
+  - set CS once (or hardwired)
+  - use a prepared address
+  - just transfer.
+  - how much faster?
+
+#### Could
+
+- unit tests possible?
+
+
+#### Wont
+
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+
diff --git a/libraries/ADC08XS/examples/ADC08XS_low_power/ADC08XS_low_power.ino b/libraries/ADC08XS/examples/ADC08XS_low_power/ADC08XS_low_power.ino
new file mode 100644
index 00000000..d892bc1c
--- /dev/null
+++ b/libraries/ADC08XS/examples/ADC08XS_low_power/ADC08XS_low_power.ino
@@ -0,0 +1,44 @@
+//
+//    FILE: ADC08XS_low_power.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/ADC08XS
+//
+//  to see it work measure current of the sensor.
+
+
+#include "ADC08XS.h"
+
+
+ADC084S adc01;        //  use HWSPI
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("ADC08XS_LIB_VERSION: ");
+  Serial.println(ADC08XS_LIB_VERSION);
+
+  adc01.begin(10);
+}
+
+
+void loop()
+{
+  Serial.println("low power for 15 seconds.");
+  adc01.lowPower();
+  delay(15000);
+
+  Serial.println("wake up for 15 seconds.");
+  if (adc01.isLowPower()) 
+  {
+    adc01.wakeUp();
+  }
+  Serial.print("READ: ");
+  Serial.println(adc01.read(3));
+  delay(15000);
+}
+
+
+//  -- END OF FILE --
diff --git a/libraries/ADC08XS/examples/ADC08XS_performance/ADC08XS_performance.ino b/libraries/ADC08XS/examples/ADC08XS_performance/ADC08XS_performance.ino
new file mode 100644
index 00000000..4591f660
--- /dev/null
+++ b/libraries/ADC08XS/examples/ADC08XS_performance/ADC08XS_performance.ino
@@ -0,0 +1,67 @@
+//
+//    FILE: ADC08XS_performance.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: performance measurement for ADC082S SPI based ADC
+//     URL: https://github.com/RobTillaart/ADC08XS
+
+
+#include "ADC08XS.h"
+
+
+ADC082S adc;  //  HW SPI
+// ADC082S adc(5, 6, 7);    //  SW SPI UNO   - adjust pins if needed
+// ADC082S adc(20, 21);     //  SW SPI ESP32 - adjust pins if needed
+const uint8_t SELECT_PIN = 10;
+
+uint32_t start, stop, read_time;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("ADC08XS_LIB_VERSION: ");
+  Serial.println(ADC08XS_LIB_VERSION);
+  Serial.println();
+
+  Serial.println("ADC\tMAXVALUE");
+  Serial.print("adc\t");
+  Serial.println(adc.maxValue());
+  Serial.println("\nTiming in micros().\n");
+  delay(100);
+
+  Serial.println("***************************************\n");
+  for (int s = 1; s <= 64; s++)
+  {
+    uint32_t val = 0;
+    uint32_t speed = s * 1000000UL;
+    adc.setSPIspeed(speed);
+    adc.begin(SELECT_PIN);
+
+    delay(100);
+    start = micros();
+    for (int i = 0; i < 1000; i++)
+    {
+    val += adc.read(0);
+    }
+    stop = micros();
+    read_time = stop - start;
+
+    Serial.print(speed);
+    Serial.print("\tadc.read()\t");
+    Serial.print(read_time);
+    Serial.print("\t");
+    Serial.println(val);
+    delay(100);
+  }
+
+  Serial.println("done...");
+}
+
+
+void loop()
+{
+}
+
+
+//  -- END OF FILE --
diff --git a/libraries/ADC08XS/examples/ADC08XS_performance/performance_0.1.0.md b/libraries/ADC08XS/examples/ADC08XS_performance/performance_0.1.0.md
new file mode 100644
index 00000000..9efb8d07
--- /dev/null
+++ b/libraries/ADC08XS/examples/ADC08XS_performance/performance_0.1.0.md
@@ -0,0 +1,29 @@
+
+
+## Performance test  
+
+Test sketch:  ADC081S_performance.ino
+
+
+### Library version: 0.1.0
+
+There is only a transfer of 2 bytes. Times in microseconds.
+
+
+|  device    |  Test        | HW 1 MHz | HW 2 MHz | HW 4 MHz | HW 8 MHz  | HW 10 MHz | HW 12 MHz | HW 14 MHz | HW 16 MHz |
+|:-----------|:-------------|:--------:|:--------:|:--------:|:---------:|:---------:|:---------:|:---------:|:---------:|
+|  UNO       |  adc.read()  |   33.6   |   25.6   |   21.6   |   19.6    |     -     |     -     |     -     |     -     |
+|  ESP32     |  adc.read()  |   25.4   |   16.7   |   12.2   |   10.0    |    9.6    |    9.4    |    9.2    |    8.9    |
+
+
+
+|  device  |  Test        | SW max speed  |  notes  |
+|:---------|:-------------|--------------:|:--------|
+|  UNO     |  adc.read()  |    238.2      |  UNO has relative slow digital IO
+|  ESP32   |  adc.read()  |      6.9      |  faster than HW SPI as it has no transfer overhead.
+
+
+
+### Notes
+
+
diff --git a/libraries/ADC08XS/examples/ADC08XS_read/ADC08XS_read.ino b/libraries/ADC08XS/examples/ADC08XS_read/ADC08XS_read.ino
new file mode 100644
index 00000000..4f4cf8e5
--- /dev/null
+++ b/libraries/ADC08XS/examples/ADC08XS_read/ADC08XS_read.ino
@@ -0,0 +1,77 @@
+//
+//    FILE: ADC08XS_read.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo
+//     URL: https://github.com/RobTillaart/ADC08XS
+
+
+#include "ADC08XS.h"
+
+
+ADC082S adc01;           //  use HWSPI
+ADC124S adc02(5, 6, 7);  //  use SWSPI
+
+uint32_t start, stop;
+
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.print("ADC08XS_LIB_VERSION: ");
+  Serial.println(ADC08XS_LIB_VERSION);
+
+  adc01.begin(10);
+  adc02.begin(5);
+
+  Serial.println();
+  Serial.println("ADC\tMAXVALUE");
+  Serial.print("adc01\t");
+  Serial.println(adc01.maxValue());
+  delay(10);
+  start = micros();
+  uint16_t val = adc01.read(0);
+  stop = micros();
+  Serial.print("hwspi:\t");
+  Serial.print(stop - start);
+  Serial.print("\t");
+  Serial.println(val);
+
+  Serial.print("adc02\t");
+  Serial.println(adc02.maxValue());
+  delay(10);
+  start = micros();
+  val = adc02.read(0);
+  stop = micros();
+  Serial.print("swspi:\t");
+  Serial.print(stop - start);
+  Serial.print("\t");
+  Serial.println(val);
+
+  Serial.println();
+}
+
+
+void loop()
+{
+  uint16_t val0 = adc01.read(0);
+  uint16_t val1 = adc01.read(1);
+  Serial.print("adc01:\t");
+  Serial.print(val0);
+  Serial.print("\t");
+  Serial.println(val1);
+
+  Serial.print("adc02:\t");
+  for (uint8_t ch = 0 ; ch < adc02.maxChannel(); ch++)
+  {
+    uint16_t val = adc02.read(ch);
+    Serial.print(val);
+    Serial.print("\t");
+  }
+  Serial.println();
+
+  delay(5000);
+}
+
+
+//  -- END OF FILE --
diff --git a/libraries/ADC08XS/keywords.txt b/libraries/ADC08XS/keywords.txt
new file mode 100644
index 00000000..e2a96cb9
--- /dev/null
+++ b/libraries/ADC08XS/keywords.txt
@@ -0,0 +1,35 @@
+# Syntax Colouring Map For ADC08XS
+
+# Data types (KEYWORD1)
+ADC08XS	KEYWORD1
+ADC082S	KEYWORD1
+ADC102S	KEYWORD1
+ADC122S	KEYWORD1
+
+ADC084S	KEYWORD1
+ADC104S	KEYWORD1
+ADC124S	KEYWORD1
+
+
+# Methods and Functions (KEYWORD2)
+begin	KEYWORD2
+maxValue	KEYWORD2
+maxChannel	KEYWORD2
+
+read	KEYWORD2
+
+setSPIspeed	KEYWORD2
+getSPIspeed	KEYWORD2
+usesHWSPI	KEYWORD2
+
+count	KEYWORD2
+
+lowPower	KEYWORD2
+wakeUp	KEYWORD2
+isLowPower	KEYWORD2
+
+
+# Constants (LITERAL1)
+ADC08XS_LIB_VERSION	LITERAL1
+
+
diff --git a/libraries/ADC08XS/library.json b/libraries/ADC08XS/library.json
new file mode 100644
index 00000000..dd056cca
--- /dev/null
+++ b/libraries/ADC08XS/library.json
@@ -0,0 +1,23 @@
+{
+  "name": "ADC08XS",
+  "keywords": "ADC082S, ADC084S, ADC102S, ADC104S, ADC122S, ADC124S",
+  "description": "Arduino library for ADC08XS 8, 10, 12 bit ADC (SPI), 2 or 4 channel.",
+  "authors":
+  [
+    {
+      "name": "Rob Tillaart",
+      "email": "Rob.Tillaart@gmail.com",
+      "maintainer": true
+    }
+  ],
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/RobTillaart/ADC08XS.git"
+  },
+  "version": "0.1.0",
+  "license": "MIT",
+  "frameworks": "*",
+  "platforms": "*",
+  "headers": "ADC08XS.h"
+}
diff --git a/libraries/ADC08XS/library.properties b/libraries/ADC08XS/library.properties
new file mode 100644
index 00000000..610f2cd9
--- /dev/null
+++ b/libraries/ADC08XS/library.properties
@@ -0,0 +1,11 @@
+name=ADC08XS
+version=0.1.0
+author=Rob Tillaart <rob.tillaart@gmail.com>
+maintainer=Rob Tillaart <rob.tillaart@gmail.com>
+sentence=Arduino library for ADC08XS 8, 10, 12 bit ADC (SPI), 2 or 4 channel.
+paragraph=ADC082S, ADC084S, ADC102S, ADC104S, ADC122S, ADC124S
+category=Sensors
+url=https://github.com/RobTillaart/ADC08XS
+architectures=*
+includes=ADC08XS.h
+depends=
diff --git a/libraries/ADC08XS/test/unit_test_001.cpp b/libraries/ADC08XS/test/unit_test_001.cpp
new file mode 100644
index 00000000..92c54d96
--- /dev/null
+++ b/libraries/ADC08XS/test/unit_test_001.cpp
@@ -0,0 +1,72 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2024-01-10
+// PURPOSE: unit tests for the ADC081S
+//          https://github.com/RobTillaart/ADC081S
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// ----------------------------
+// assertEqual(expected, actual);               // a == b
+// assertNotEqual(unwanted, actual);            // a != b
+// assertComparativeEquivalent(expected, actual);    // abs(a - b) == 0 or (!(a > b) && !(a < b))
+// assertComparativeNotEquivalent(unwanted, actual); // abs(a - b) > 0  or ((a > b) || (a < b))
+// assertLess(upperBound, actual);              // a < b
+// assertMore(lowerBound, actual);              // a > b
+// assertLessOrEqual(upperBound, actual);       // a <= b
+// assertMoreOrEqual(lowerBound, actual);       // a >= b
+// assertTrue(actual);
+// assertFalse(actual);
+// assertNull(actual);
+
+// // special cases for floats
+// assertEqualFloat(expected, actual, epsilon);    // fabs(a - b) <= epsilon
+// assertNotEqualFloat(unwanted, actual, epsilon); // fabs(a - b) >= epsilon
+// assertInfinity(actual);                         // isinf(a)
+// assertNotInfinity(actual);                      // !isinf(a)
+// assertNAN(arg);                                 // isnan(a)
+// assertNotNAN(arg);                              // !isnan(a)
+
+#include <ArduinoUnitTests.h>
+
+
+#include "Arduino.h"
+#include "ADC08XS.h"
+
+
+unittest_setup()
+{
+  fprintf(stderr, "ADC08XS_LIB_VERSION: %s\n", (char *) ADC08XS_LIB_VERSION);
+}
+
+
+unittest_teardown()
+{
+}
+
+
+unittest(test_constructor)
+{
+  ADC082S ADC_1;
+  ADC102S ADC_2;
+  ADC124S ADC_3;
+
+  ADC_1.begin(7);
+  ADC_2.begin(8);
+  ADC_3.begin(9);
+
+  assertEqual(255,  ADC_1.maxValue());
+  assertEqual(2,    ADC_1.maxChannel());
+  assertEqual(1023, ADC_2.maxValue());
+  assertEqual(2,    ADC_2.maxChannel());
+  assertEqual(4095, ADC_3.maxValue());
+  assertEqual(4,    ADC_3.maxChannel());
+}
+
+
+unittest_main()
+
+
+//  -- END OF FILE --