Snap4Arduino was a Snap! extension, a full Snap! implementation to interact with the physical world, through many types of electronic devices, especially those compatible with Arduino. Starting with Snap! v11, the S4A Connector library is doing this job.
Snap! is a broadly inviting programming language for kids and adults that's also a platform for serious study of computer science. It is inspired by Scratch, written by Jens Mönig and Brian Harvey and presented by the University of California at Berkeley.
Snap4Arduino requiere boards with Firmata firmware installed. Check devices section.
Just download, unpack/unzpip and click Snap4Arduino.
Choose your system: Windows 64 (or its portable option), GNU/Linux 64, MacOSX, Windows32 (or its portable) or GNU/Linux 32.
Install Snap4Arduino connector and then, just play Snap4Arduino online (you can install it as an app from the browser to run it offline).
Chromium/Chrome/Edge browsers are required
Download Snap4Arduino connector, unzip its crx folder, type chrome://extensions, select Developer mode and Upload an unpacked extension selecting that crx file (or just drag and drop it).
Just play Snap4Arduino online (you can install it as an app from the browser to run it offline).
Play online
Plugin for Chromebooks (chrome web store)
Chrome/Chromium/Edge plugin (download extension)
Last Snap4Arduino version is 10.3.6 (released on 08/01/2025) and its Snap4Arduino connector version (chrome extension)is 8.0
You can also find older releases and unmaintained versions
Snap4Arduino requires boards with Firmata firmware uploaded.
You can upload Firmata firmwares direcly from Snap4Arduino (with both desktop and online versions) to UNOs compatible boards. Or just here:
A lot of devices support Standard Firmata. Tested on Nano, Mega, Leonardo and Micro.
Many 32 bit devices support Firmata. Tested on Due, 101, ESP8266 and NodeMCU.
Standard Firmata is directly uploadable with any Arduino IDE.
Other options are: SA5Firmata, Creative Robotix Firmata, MC Firmata Collection, Robotics-unleashed, Snap4ArduinoDev, LCD Firmata and Ultrasound Firmata
Here's a couple of fun things that can be done with Snap4Arduino, most of them recorded on a Hi-Tech last generation potato camera.
You can find our GitHub repo at Snap4Arduino@GitHub. Please feel free to send us your pull requests and participate in reporting, fixing or commenting on bugs!
To ensure your Edison Professional Scratch 2500 lasts a decade, follow these maintenance schedules.
Weekly:
Monthly:
Safety Warnings (Legal Notice):
Because the official manual is a PDF you might only glance at, here are the critical maintenance rules:
You can find the full digital manual for the Edison Professional Scratch 2500 DJ System Go to product viewer dialog for this item. on platforms like Scribd and the Internet Archive. Key Operating Instructions
Track Programming: In STOP mode, press PROG to enter programming mode, select up to 20 tracks using the navigation buttons, and press PROG after each selection. Press PLAY/PAUSE to begin.
Navigation Wheel: Turning the wheel at higher speeds increases the browsing speed through your tracks.
Cue Points: Press the CUE button during playback to immediately return to the starting position of the track.
Jog Wheel Search: While paused, rotate the jog wheel to move the playback head frame-by-frame (clockwise for forward, counter-clockwise for backward). Hardware Features & Connectivity
Dual Media Decks: Supports playback via dual CD decks and USB flash drives, which the unit reads similarly to standard CDs. edison professional scratch 2500 dj system manual
Mixer Section: Features a 3-band equalizer, pitch control, and a built-in phono preamp with a Line/Phono switch for external turntables.
Software Use: The unit is not a MIDI device. To use it with software like VirtualDJ, you must use it as an analog mixer connected to a separate sound card or MIDI controller.
Inputs/Outputs: Includes RCA/Coaxial inputs and outputs, as well as a 1/4" headphone jack and 1/4" microphone input.
đź’ˇ Quick Tip: If you're using this with VirtualDJ, remember that it lacks separate deck outputs for each deck, so standard Timecode CDs typically won't work unless you route through an external sound card. Edison Scratch 2500 DJ System Manual | PDF - Scribd
Master Your Mix: The Ultimate Guide to the Edison Professional Scratch 2500
Whether you’ve just unboxed a new unit or inherited a classic, the Edison Professional Scratch 2500
remains a staple for DJs who value a versatile, standalone system. Known for its dual-deck interface and robust mixing capabilities, this unit bridges the gap between old-school CD mixing and modern digital play.
Below is a breakdown of how to get the most out of your system, from setup to advanced track programming. Core Features at a Glance
The Scratch 2500 is a "workhorse" designed for both portability and high-impact performance. Dual Media Support
: Features dual CD players (compatible with CD-R/RW) and two USB ports for digital MP3 playback. Tactile Control To ensure your Edison Professional Scratch 2500 lasts
: Large jog wheels for scratching, searching, and pitch control (±12%). Built-in Mixer : A 2-channel analog mixer with 3-band EQ and gain control. Connectivity
: Professional-grade balanced XLR outputs alongside standard RCA master and record outputs. Essential Setup Guide
To get your system live and loud, follow these standard connection steps found in the Edison Scratch 2500 Manual and common DJ practices: Audio Output : Connect the Master Output (RCA or XLR) to your main powered speakers or amplifier. External Gear Line/Phono
inputs on the rear panel to add external turntables or media players. Ensure the toggle switch matches your device type. Monitoring : Plug your headphones into the front jack to utilize the Cue System
, allowing you to preview the next track before the audience hears it. Microphone : Use the dedicated
XLR or 1/4" input for announcements, featuring independent volume control. Pro Tip: Program Your Set
One often-overlooked feature is the ability to program a specific sequence of tracks (up to 20) directly on the unit: How To Set Up Your DJ Equipment
The Edison Professional Scratch 2500 Go to product viewer dialog for this item.
is a dual-deck, portable DJ system designed to bridge the gap between hobbyist exploration and professional-grade performance. This essay explores the technical functionality and versatility of the system, which integrates modern digital media with traditional mixing controls. Core Functionality and Design At its core, the Scratch 2500
is a dual CD and USB player combined with an analog mixer. Its hardware interface features tactile "vinyl-simulating" jog wheels that allow users to scratch, pitch-bend, and search through tracks manually. The system supports various media formats, including CD, CD-R, and MP3, and includes dual USB ports for direct playback from flash drives. Monthly:
A standout feature is its ease of use for mobile DJs; the system is often bundled with a travel hard case and features an anti-shock system with a 20-second buffer to prevent playback interruptions during high-energy events. Mixing and Creative Features
The internal mixer provides several tools for seamless transitions and track manipulation:
Audio Control: It features a 3-band EQ with gain control per channel, allowing for precise frequency adjustment.
Performance Tools: DJs can utilize seamless looping, reverse playback, and a crossfader with delay options to craft unique sets.
Display: Dual backlit LED screens provide essential track data, such as ID tags and time elapsed.
Programming: Users can program up to 20 tracks in sequence when the unit is in "STOP" mode. Integration and Connectivity While primarily a standalone hardware unit, the Scratch 2500
can be integrated into larger setups via its RCA and XLR outputs. Notably, the unit is not a native MIDI device. For users wanting to use software like VirtualDJ, it must be connected as an analog mixer through a separate sound card or used with timecode CDs, though the latter is limited by the lack of separate deck outputs. By offering a comprehensive all-in-one interface, the Scratch 2500
serves as a robust entry point for those looking to master beat-mixing and scratching without the need for a complex laptop-based setup. Edison Scratch 2500 DJ System Manual | PDF - Scribd
It represents a specific era where DJ technology was bridging the gap between analog vinyl and the digital future.
Here is an "article-style" breakdown of the Edison Professional Scratch 2500, based on its manual and design specifications.
The original manual often omits these practical details: