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0.1.1 I2C_PWM_generator
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‎sketches/I2C_PWM_generator/.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

‎sketches/I2C_PWM_generator/.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"

‎sketches/I2C_PWM_generator/.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@v4
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- uses: arduino/arduino-lint-action@v1
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with:
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library-manager: update
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compliance: strict

‎sketches/I2C_PWM_generator/.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@v4
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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

‎sketches/I2C_PWM_generator/.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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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@v4
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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$"

‎sketches/I2C_PWM_generator/CHANGELOG.md‎

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# Change Log I2C_PWM_generator
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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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## [0.1.1] - 2025-05-16
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- add LED 13 as heartbeat indicator.
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- add watchdog reset (2 seconds)
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- add POSValue array, power on start values.
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- add currentValue array to prep getPWM()
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- add get PWM value - request register 0..5, 1 byte
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- add set all - register 0x20
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- add set to power on reset - register (command) 0x21
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- update readme.md
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## [0.1.0] - 2024-11-25
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- initial version
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// -- END OF FILE --
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‎sketches/I2C_PWM_generator/I2C_PWM_generator.ino‎

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//
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// FILE: I2C_PWM_generator.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// DATE: 2024-11-25
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// PURPOSE: Arduino UNO as 6 channel PWM co-processor.
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// URL: https://github.com/RobTillaart/I2C_PWM_generator
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// https://github.com/RobTillaart/PCA9553/issues/9
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//
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#include <avr/wdt.h>
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#include <Wire.h>
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// adjust if needed
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#define I2C_BASE_ADDRESS 0x30
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#define I2C_ADDRESS_PIN 4
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#define I2C_BASE_CLOCK 100000
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const int PWMpins[6] = {3, 5, 6, 9, 10, 11};
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// power on start (POS) values can be adapted to your need.
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const uint8_t POSValue[6] = {0, 0, 0, 0, 0, 0 };
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// cache current value, prep for getPWM()
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uint8_t currentValue[6];
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const int LEDPIN = 13;
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uint32_t lastBlink = 0;
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int reg = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__); // for debugging
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// HEARTBEAT PIN
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pinMode(13, OUTPUT);
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digitalWrite(13, HIGH);
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// POWER ON START
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for (int i = 0; i < 6; i++)
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{
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analogWrite(PWMpins[i], POSValue[i]);
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currentValue[i] = POSValue[i];
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}
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// I2C ADDRESS
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uint8_t I2Caddress = 0x00;
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// get address bit
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pinMode(I2C_ADDRESS_PIN, INPUT);
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if (digitalRead(I2C_ADDRESS_PIN) == HIGH) I2Caddress += 0x01;
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I2Caddress += I2C_BASE_ADDRESS; // 0x30..0x31
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// START AS SLAVE
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Wire.begin(I2Caddress);
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Wire.setClock(I2C_BASE_CLOCK);
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// WATCHDOG
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wdt_enable(WDTO_2S);
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// WAIT FOR COMMANDS
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Wire.onRequest(requestEvent);
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Wire.onReceive(receiveEvent);
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}
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void loop()
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{
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// watchdog
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wdt_reset();
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// heartbeat
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uint32_t now = millis();
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if ((now - lastBlink) >= 1000)
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{
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lastBlink = now;
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digitalWrite(13, !digitalRead(13));
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}
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}
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/////////////////////////////////////////////////////
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//
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// EVENT HANDLERS
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//
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void receiveEvent(int count)
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{
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// catch no data call
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if (count == 0) return;
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int value = 0;
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// read the "register"
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reg = Wire.read();
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switch (reg)
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{
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// PWM set one
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case 0 ... 5:
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// value missing?
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if (count < 2) return;
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value = Wire.read();
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currentValue[reg] = value;
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analogWrite(PWMpins[reg], value);
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break;
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// PWM set all (experimental)
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case 0x20:
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value = 0; // default value
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if (count >= 2) value = Wire.read();
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for (int i = 0; i < 6; i++)
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{
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currentValue[reg] = value;
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analogWrite(PWMpins[reg], value);
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}
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break;
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// PWM power on start (experimental)
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case 0x21:
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for (int i = 0; i < 6; i++)
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{
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analogWrite(PWMpins[i], POSValue[i]);
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currentValue[i] = POSValue[i];
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}
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break;
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default: // nothing
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break;
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}
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}
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// experimental
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void requestEvent()
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{
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// construct answer for current register.
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switch (reg)
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{
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case 0 ... 5:
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Wire.write(currentValue[reg]);
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break;
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default:
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// return nothing.
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break;
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}
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}
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// -- END OF FILE --

‎sketches/I2C_PWM_generator/LICENSE‎

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MIT License
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Copyright (c) 2024-2025 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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