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0.1.0 LC7822
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‎libraries/LC7822/.arduino-ci.yml‎

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platforms:
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rpipico:
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board: rp2040:rp2040:rpipico
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package: rp2040:rp2040
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gcc:
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features:
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defines:
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- ARDUINO_ARCH_RP2040
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warnings:
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flags:
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packages:
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rp2040:rp2040:
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url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
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compile:
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# Choosing to run compilation tests on 2 different Arduino platforms
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platforms:
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- uno
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# - due
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# - zero
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# - leonardo
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- m4
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- esp32
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- esp8266
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# - mega2560
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- rpipico
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libraries:
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- "printHelpers"

‎libraries/LC7822/.github/FUNDING.yml‎

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

‎libraries/LC7822/.github/workflows/arduino-lint.yml‎

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name: Arduino-lint
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on: [push, pull_request]
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jobs:
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lint:
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runs-on: ubuntu-latest
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timeout-minutes: 5
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steps:
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- uses: actions/checkout@v5
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- uses: arduino/arduino-lint-action@v2
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with:
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library-manager: update
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compliance: strict

‎libraries/LC7822/.github/workflows/arduino_test_runner.yml‎

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name: Arduino CI
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on: [push, pull_request]
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jobs:
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runTest:
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runs-on: ubuntu-latest
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timeout-minutes: 20
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steps:
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- uses: actions/checkout@v5
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- uses: ruby/setup-ruby@v1
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with:
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ruby-version: 2.6
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- run: |
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gem install arduino_ci
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arduino_ci.rb

‎libraries/LC7822/.github/workflows/jsoncheck.yml‎

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name: JSON check
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on:
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push:
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paths:
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- '**.json'
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pull_request:
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paths:
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- '**.json'
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jobs:
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test:
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runs-on: ubuntu-latest
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timeout-minutes: 5
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steps:
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- uses: actions/checkout@v5
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- name: json-syntax-check
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uses: limitusus/json-syntax-check@v2
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with:
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pattern: "\\.json$"

‎libraries/LC7822/CHANGELOG.md‎

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# Change Log LC7822
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## [0.1.0] - 2025-12-20
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- initial version
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‎libraries/LC7822/LC7822.cpp‎

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//
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// FILE: LC7822.cpp
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// AUTHOR: Rob Tillaart
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// DATE: 2025-12-20
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// VERSION: 0.1.0
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// PURPOSE: Arduino library for the LC7822 8 channel analogue switch.
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// URL: https://github.com/RobTillaart/LC7822
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#include "LC7822.h"
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LC7822::LC7822(uint8_t dataPin, uint8_t clockPin, uint8_t cePin, uint8_t sPin, uint8_t resetPin)
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{
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_address = 11;
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_dataPin = dataPin;
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_clockPin = clockPin;
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_cePin = cePin;
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_sPin = sPin;
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_resetPin = resetPin;
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_switches = 0; // all off by default.
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}
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bool LC7822::begin()
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{
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pinMode(_dataPin, OUTPUT);
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digitalWrite(_dataPin, LOW);
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pinMode(_clockPin, OUTPUT);
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digitalWrite(_clockPin, LOW);
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pinMode(_cePin, OUTPUT);
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digitalWrite(_cePin, LOW);
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pinMode(_sPin, OUTPUT);
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digitalWrite(_sPin, LOW);
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if (_resetPin != 255)
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{
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pinMode(_resetPin, OUTPUT);
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digitalWrite(_resetPin, LOW); // right polarity?
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}
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return true;
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}
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bool LC7822::reset()
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{
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if (_resetPin != 255)
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{
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digitalWrite(_resetPin, HIGH);
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delayMicroseconds(2);
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digitalWrite(_resetPin, LOW);
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// force all off. needed? test...
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_switches = 0;
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_updateDevice();
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return true;
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}
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return false;
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}
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bool LC7822::setAll(uint8_t value)
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{
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_switches = value;
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_updateDevice();
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return true;
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}
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uint8_t LC7822::getAll()
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{
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return _switches;
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}
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bool LC7822::setSwitch(uint8_t sw, bool val)
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{
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if (sw > 7) return false;
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if (val) // ON
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{
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_switches |= (1 << sw);
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}
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else
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{
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_switches &= ~(1 << sw);
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}
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_updateDevice();
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return true;
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}
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bool LC7822::getSwitch(uint8_t sw)
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{
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if (sw > 7) return false;
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return _switches & (1 << sw);
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}
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//////////////////////////////////////////////////
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//
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// PROTECTED
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//
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void LC7822::_updateDevice()
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{
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// select this device
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digitalWrite(_sPin, HIGH);
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// send address == 4 bits
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for (uint8_t mask = 0x08; mask > 0x00; mask >>= 1)
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{
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digitalWrite(_dataPin, (_address & mask));
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if (_microDelay) delayMicroseconds(_microDelay);
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digitalWrite(_clockPin, HIGH);
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if (_microDelay) delayMicroseconds(_microDelay);
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digitalWrite(_clockPin, LOW);
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}
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// send data == 8 bits
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if (_microDelay) delayMicroseconds(_microDelay);
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digitalWrite(_cePin, HIGH);
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if (_microDelay) delayMicroseconds(_microDelay);
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for (uint8_t mask = 0x80; mask > 0x00; mask >>= 1)
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{
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digitalWrite(_dataPin, (_switches & mask));
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if (_microDelay) delayMicroseconds(_microDelay);
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digitalWrite(_clockPin, HIGH);
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if (_microDelay) delayMicroseconds(_microDelay);
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digitalWrite(_clockPin, LOW);
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}
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digitalWrite(_cePin, HIGH);
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digitalWrite(_sPin, LOW);
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}
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//////////////////////////////////////////////////
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//
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// DERIVED
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//
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LC7821::LC7821(uint8_t dataPin, uint8_t clockPin, uint8_t cePin, uint8_t sPin, uint8_t resetPin)
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:LC7822(dataPin, clockPin, cePin, sPin, resetPin)
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{
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_address = 13;
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}
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LC7823::LC7823(uint8_t dataPin, uint8_t clockPin, uint8_t cePin, uint8_t sPin, uint8_t resetPin)
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:LC7822(dataPin, clockPin, cePin, sPin, resetPin)
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{
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_address = 15;
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}
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// -- END OF FILE --
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‎libraries/LC7822/LC7822.h‎

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#pragma once
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//
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// FILE: LC7822.h
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// AUTHOR: Rob Tillaart
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// DATE: 2025-12-20
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// VERSION: 0.1.0
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// PURPOSE: Arduino library for the LC7822 8 channel analogue switch.
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// URL: https://github.com/RobTillaart/LC7822
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#include "Arduino.h"
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#define LC7822_LIB_VERSION (F("0.1.0"))
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class LC7822
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{
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public:
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LC7822(uint8_t dataPin, uint8_t clockPin, uint8_t cePin,
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uint8_t sPin, uint8_t resetPin = 255);
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bool begin();
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bool reset();
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uint8_t getAddress() { return _address; };
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bool setAll(uint8_t value);
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uint8_t getAll();
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bool setSwitch(uint8_t sw, bool val);
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bool getSwitch(uint8_t sw);
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// tune timing
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void setMicroDelay(uint8_t udel) { _microDelay = udel; };
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uint8_t getMicroDelay() { return _microDelay; };
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protected:
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uint8_t _address;
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uint8_t _dataPin;
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uint8_t _clockPin;
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uint8_t _cePin;
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uint8_t _sPin;
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uint8_t _resetPin;
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uint8_t _switches = 0; // default all off
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uint8_t _microDelay = 5;
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void _updateDevice();
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};
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///////////////////////////////////////////
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//
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// DERIVED
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//
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class LC7821 : public LC7822
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{
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public:
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LC7821(uint8_t dataPin, uint8_t clockPin, uint8_t cePin,
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uint8_t sPin, uint8_t resetPin = 255);
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};
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class LC7823 : public LC7822
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{
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public:
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LC7823(uint8_t dataPin, uint8_t clockPin, uint8_t cePin,
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uint8_t sPin, uint8_t resetPin = 255);
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};
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// -- END OF FILE --
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‎libraries/LC7822/LICENSE‎

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MIT License
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Copyright (c) 2025-2026 Rob Tillaart
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

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