Rockbox Archos Recorder 15 Datasheet download pdf

his project provides a wired remote

control for certain members of the

Archos family of hard disk-based

Jukebox MP3 players and recorders. Key

features of the design are:

• Low component count and cost.

• Simple construction.

• Compatible with a small enclosure.

• Runs off a single battery.

• Long battery life.

Introduction

Although there are now many different

audio compression technologies available,

MP3 is, without dispute, the most widespread

and best supported of those used for moving

music around on the Internet and for carrying

it with you as you travel. Following on

the heels of small capacity (64-128 MB)

solid-state players that hold about an hour or

two of music, there are now a number of hard

disk-based MP3 players and recorders

available, such as those offered by Archos

(www.archos.com).

While not as robust as the solid-state

players — which have disk sizes up to 20 GB

— these devices can store the equivalent of

300 CDs in MP3 format — even more if you

are prepared to sacrifice sound quality for

greater compression. The good news is that

they are becoming more affordable as the

cost of disk storage continues its downward

trend. While most would agree that they lack

the elegance of products such as the Apple

iPod, the Archos players come with a much

more palatable price tag.

Price is not the only advantage that

Archos can claim over its rivals. Several of the

company’s products have attracted an active

open-source community that is developing

alternative software for them. This software,

called Rockbox (http://rockbox.haxx.se), is

rapidly becoming superior to the standard

software. The Rockbox site also offers lots of

information about the Archos hardware and

ways in which to modify it, either directly or

via pointers to other websites. I’ve upgraded

my 20 GB Jukebox Recorder with a 40 GB

drive, thanks to information available there.

This is a relatively simple upgrade, but

there are more tricky ones to be found if

you like modifying your gadgets and feel

adventurous.

Looking through the mailing list hosted at

the Rockbox site, I found enough information

to be able to design and construct a wired

remote control for my recorder. Archos offers

a remote, but only as a component within a

complete travel kit that also includes a power

adapter, cassette adapter, and headphones —

all of which I already have. Building my own

remote seemed to be a much better option

than paying for things I didn’t need.

MAY 2004

PIC-Based Archos

Remote Control

A Great Use for a Small PIC

UTS &

OLTS

Everything For Electronics

This Month’s

Projects

Archos Remote . . . .44

Digital Project . . . . . 52

The Fuzzball

Rating System

To find out the level

of difficulty for

each of these

projects, turn to

Fuzzball for

the answers.

The scale is from

1-4, with four

Fuzzballs being

the more difficult

or advanced

projects. Just look

for the Fuzzballs in

the opening header.

You’ll also find

information included

in each article on

any special tools

or skills you’ll

need to complete

the project.

Let the

soldering begin!

Project by Steve Russell

Figure 1.

Tip and ring connections.

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Remote Control

This project provides a wired remotecontrol for certain members of theArchos family of hard disk-basedJukebox MP3 players and recorders. Key features

Page 2 - PIC-Based Archos Remote

Using the Remote With YourJukeboxThe remote control described here should work withall Archos Jukebox Recorder and Jukebox Studio devices(see Sidebar)

Page 3 - Design Details

Referring to the schematic in Figure 3, two outputs ofthe PIC12LC508A (GP4 and 5) drive a 2 x 3 matrix ofswitches. The switch states are read in using

Page 4

flexible enough to allow additional commands.• Repeatedly sending the volume adjustment commands if the correspondingswitches are held down, so that t

Page 5 - Handling Key Presses

Power ConsumptionTo keep power consumption to a minimum — therebyextending battery life — the design ensures that the ’508Aspends most of its time asl

Page 6

instructions (no operation). These allow the switches to beread accurately and are necessary because the pullupresistor on GP3 is about 10x larger tha

Page 7 - Completing the Project

via a link in fntable.Calibration ModeAsynchronous communication depends on bothtransmitter and receiver running at the same speed. Therecorder expect

Page 8 - Be an FCC

very simple. I decided to make a printed circuit board onwhich to mount them. The PCB layout was created usingthe free version of Eagle (www.cadsoft.d

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Rockbox Archos Recorder 15 Datasheet

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Summary of Contents

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