0.1.0 I2C_HC4067

Author: RobTillaart

libraries/I2C_HC4067/.arduino-ci.yml

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+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
+
+  libraries:
+    - "printHelpers"

libraries/I2C_HC4067/.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: RobTillaart
+custom: "https://www.paypal.me/robtillaart"

libraries/I2C_HC4067/.github/workflows/arduino-lint.yml

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+name: Arduino-lint
+
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - uses: arduino/arduino-lint-action@v2
+        with:
+          library-manager: update
+          compliance: strict

libraries/I2C_HC4067/.github/workflows/arduino_test_runner.yml

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+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  runTest:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb

libraries/I2C_HC4067/.github/workflows/jsoncheck.yml

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+name: JSON check
+
+on:
+  push:
+    paths:
+      - '**.json'
+  pull_request:
+    paths:
+      - '**.json'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v2
+        with:
+          pattern: "\\.json$"

libraries/I2C_HC4067/CHANGELOG.md

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+# Change Log I2C_HC4067
+
+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] - 2026-03-30
+- initial version (based upon 0.3.1 HC4067)
+
+

libraries/I2C_HC4067/I2C_HC4067.h

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+#pragma once
+//
+//    FILE: I2C_I2C_HC4067.h
+//  AUTHOR: Rob Tillaart
+//    DATE: 2026-03-30
+// VERSION: 0.1.0
+// PURPOSE: Arduino library for CD74HC4067 1 x 16 channel multiplexer and compatibles.
+//     URL: https://github.com/RobTillaart/I2C_HC4067
+
+
+#include "Arduino.h"
+#include "Wire.h"
+
+#define I2C_HC4067_LIB_VERSION         (F("0.1.0"))
+
+
+class I2C_HC4067
+{
+public:
+  ////////////////////////////////////////////////////////////
+  //
+  //  Constructor
+  //
+  I2C_HC4067(uint8_t address, TwoWire *wire = &Wire)
+  {
+    _address = address;
+    _wire = wire;
+
+    _channel   = 0;
+    //  to force write.
+    _lastValue = 0x10;
+  }
+
+  bool begin()
+  {
+    if (! isConnected())
+    {
+      return false;
+    }
+    this->disable();
+    return true;
+  }
+
+  bool isConnected()
+  {
+    _wire->beginTransmission(_address);
+    return (_wire->endTransmission() == 0);
+  }
+
+  uint8_t getAddress()
+  {
+    return _address;
+  }
+
+
+  ////////////////////////////////////////////////////////////
+  //
+  //  HC4067 API
+  //
+  bool setChannel(uint8_t channel, bool disable = true)
+  {
+    if (channel > 15) return false;
+    if (channel != _channel)
+    {
+      _channel = channel;
+      if (disable) this->disable();  //  prevent ghost channels.
+      this->_write();
+      this->enable();
+    }
+    return true;
+  }
+
+  uint8_t getChannel()
+  {
+    return _channel;
+  }
+
+  void enable()
+  {
+    _enable = true;
+    this->_write();
+  }
+
+  void disable()
+  {
+    _enable = false;
+    this->_write();
+  }
+
+  bool isEnabled()
+  {
+    return _enable;
+  }
+
+
+private:
+  int _write()
+  {
+    uint8_t value = _channel;
+    if (_enable) value |= 0x10;
+
+    //  no change.
+    if (_lastValue == value) return 0;
+    _lastValue = value;
+    _wire->beginTransmission(_address);
+    _wire->write(value);
+    _error = _wire->endTransmission();
+    return _error;
+  }
+
+  uint8_t  _address;
+  TwoWire* _wire;
+
+  bool     _enable;
+  uint8_t  _channel;
+  uint8_t  _lastValue;
+  int      _error;
+};
+
+
+//  -- END OF FILE --
+

libraries/I2C_HC4067/LICENSE

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+MIT License
+
+Copyright (c) 2026-2026 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.