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arduino-dco-with-midi-9799b2-en.md

its possible to use the tone() function for musical notes.

for low frequencies the frequency has to be higher, but it can't be too high caused by the tolerance of the prescaler so I use a divider (4024) and a data selector (4512) to keep out the tone. has additional saw converter with DAC. the tune has its formula, too.

my module is in 19" 5U Moog format. haven't found similar project here.

EXPANDED TECHNICAL DETAILS

Digitally Controlled Oscillator (DCO)

This project builds a professional-grade monophonic musical synthesizer that blends the stability of a digital clock with the warmth of analog audio.

  • High-Resolution PWM Oscillator: The Arduino (ATmega328P or 2.0 Beta) uses high-speed Timer1 interrupts to calculate a sawtooth or square wave at 31.25kHz. This "Digital Core" ensures perfect pitch tracking across multiple octaves without thermal drift.
  • Standard MIDI Input Decoding: Captures MIDI "Note On" and "Note Off" messages from an opto-isolated 5-pin DIN input. The Arduino translates these into frequency values using a lookup table based on the equal-tempered scale.

Tone Shaping

  • Analog Low-Pass Filter: The digital pulse is filtered through a passive RC network or an active op-amp filter to remove high-frequency digital noise, resulting in a smooth, "Retro" synthesizer sound.

ข้อมูล Frontmatter ดั้งเดิม 

title: "ARDUINO DCO with MIDI"
description: "the tone() function is musical usable."
author: "trouby"
category: "Audio & Sound"
tags:
  - "Audio"
  - "Music"
  - "Communication"
views: 324
likes: 0
price: 2450
difficulty: "Intermediate"
components:
  - "1x Solder Iron"
  - "1x Arduino Nano"
tools: []
apps:
  - "1x Arduino IDE 2.0 (beta)"
downloadableFiles:
  - "https://projects.arduinocontent.cc/0f591aac-49bc-4ccc-b995-1181e867ce0b.ino"
documentationLinks: []
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seoDescription: "Create an ARDUINO DCO with MIDI support using the tone() function for musical applications and synthesis."
videoLinks: []
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/arduino-dco-with-midi-9799b2_cover.jpg"
lang: "en"