OpenCircuits - User contributions [en]

Music Player

2006-08-25T12:50:32Z

70.189.73.224: yampp

Quite a few people have released the schematics and source code for their music player.
Such open-source music players include:

== at Open Circuits ==

* [[TRAXMOD]] Digital Audio Player

== elsewhere ==

''Some of these web sites are very difficult to post comments to. I suppose posting comments about these music players here -- at Open Circuits -- is the next best thing.''

=== PIC audio player ===

People at the Microchip PIC forum are batting around ideas:
[http://forum.microchip.com/tm.aspx?m=166133 dsPic audio player],
[http://forum.microchip.com/tm.aspx?m=166337 data compression techniques],
[http://forum.microchip.com/tm.aspx?m=162048 saving an audio file to a memory].

===MintyMP3===
MP3 player in an Altoids can.
includes FM transmitter.
Uses compact flash card (reads FAT16), PIC18F452, STA013 mp3 decoder chip, FT232 USB chip.
"compact flash card. ... Cheaper & faster than multimedia cards (MMC) and can be accessed via a PCMCIA slot, as all PC laptops have, using a $5 adaptor (although you can read/write using the Java program MintyComm program talking through the serial port)"
http://ladyada.net/make/minty/
(There's a nice forum at ''[FIXME: LINK]'' for discussing this).

==="MP3 Player"===
http://www.microsyl.com/mp3/mp3.html
based on Atmel AVR
... The MP3 decoder is a VS1001k ...
The USB interface is done via FT232MB ...
... standard hard drive with MP3s stored in FAT
...
includes Infrared bi-directional interface
...
includes source code in C.

===Yet Another Mobile MP3 Player===
http://www.bobblick.com/techref/projects/yammp3/yammp3.html
"basically a personal computer that runs in a car"
(runs Linux)

===BookPC Car MP3 Player===
http://www.bobblick.com/techref/projects/mp3book/mp3book.html
"a computer I built for my car"
(runs Linux)

=== MP3Car ===
"MP3Car.Com - Home of the Car Computer Forums - Build your own Carputer"
http://mp3car.com/

=== MP3 Player ===
http://www.codepuppies.com/~ben/sens/pic/mp3/
(open-source hardware and software)
"the MAS3507D chip, from Micronas Intermetall, ... You simply clock a serial MP3 bitstream in one side, and digital audio gets clocked out of the other side."
So, we have
* Microchip PIC in the middle
* IDE interface (supports *both* hard drive *and* CD drive)
* MAS3507D chip ... to analog amplifiers ... out to headphone jack
* IR remote control.
* parallel port ... to PC, for downloading MP3s.

Stores the MP3s on the hard drive in a funky (but well documented) proprietary format,
to simplify the PIC playback code.

=== butterfly MP3 ===
An open design for a portable MP3 player.
It is designed to be easy / possible to make for a beginner and cheap as well.
An AVR Butterfly is used to simplify construction and minimise component count. The decoding is handled by a VS1001 decoder/DAC/amplifier.
The design supports the original Butterfly LCD as well as NOKIA 3310 cell phone displays. The project includes PCBs in eagle format for the player and also
an adapter board to replace the original LCD of the Butterfly with a BW Nokia 3310 or Color Nokia 6100 display.
The player uses MMC cards with a standard FAT16 file system.

http://butterflymp3.sourceforge.net/rev05Nokia02_TN.jpg

http://butterflymp3.sourceforge.net/

===yampp: Yet another MP-3 Player===
http://myplace.nu/mp3/

=== yampp Industrial III ===

The "SPE020 MP3 Player"
http://rev-ed.co.uk/picaxe/software.htm
, when you look at the .pdf, says in big letters
"yampp Industrial III
http://www.yampp.com/ "
and in smaller, hard-to-read letters, something like "Jesper Hansen -- 2003" (?).

=== CarPuter ===
[http://www.nslu2-linux.org/wiki/HowTo/CarPuter NSLU2-based CarPuter]
seems to use less power than other Linux-based MP3 players. (?)

== iPod ? ==

"Open Source Hardware"
http://www.nivi.com/blog/article/open-source-hardware
"The Bill of Materials for the 30 GB Video iPod from Jefferies &
Company's Video iPod Teardown is fascinating."
http://www.tuaw.com/2005/10/19/stock-brokers-crack-open-an-ipod-5g-so-you-dont-have-to/

== discussion ==

Rather than commercially selling yet another MP3 player,
I am
more interested in commercially selling something that has almost
identical hardware, but does something that none of these do.
--[[User:DavidCary|DavidCary]] 15:28, 25 April 2006 (PDT)

----

The article
[http://www.wired.com/news/technology/0,1282,64963,00.html "High-Tech Hearing Bypasses Ears"]
by Laila Weir begins: "A wristwatch phone that lets you listen by sticking a finger in your ear, an MP3 player that vibrates the bones in your skull to play music that only you can hear ..."
So how does this "bone-conduction technology" work?

That article also mentions that "student ... Sam James created Soundwaves -- an underwater MP3 player".

-----

[http://xess.com/faq/M0000141.HTM MP3 decoding on a FPGA ?]

-----

Music Player

2006-08-11T00:27:14Z

70.189.73.224: MP3 decoding on a FPGA ?

Quite a few people have released the schematics and source code for their music player.
Such open-source music players include:

== at Open Circuits ==

* [[TRAXMOD]] Digital Audio Player

== elsewhere ==

''Some of these web sites are very difficult to post comments to. I suppose posting comments about these music players here -- at Open Circuits -- is the next best thing.''

=== PIC audio player ===

People at the Microchip PIC forum are batting around ideas:
[http://forum.microchip.com/tm.aspx?m=166133 dsPic audio player],
[http://forum.microchip.com/tm.aspx?m=166337 data compression techniques],
[http://forum.microchip.com/tm.aspx?m=162048 saving an audio file to a memory].

===MintyMP3===
MP3 player in an Altoids can.
includes FM transmitter.
Uses compact flash card (reads FAT16), PIC18F452, STA013 mp3 decoder chip, FT232 USB chip.
"compact flash card. ... Cheaper & faster than multimedia cards (MMC) and can be accessed via a PCMCIA slot, as all PC laptops have, using a $5 adaptor (although you can read/write using the Java program MintyComm program talking through the serial port)"
http://ladyada.net/make/minty/
(There's a nice forum at ''[FIXME: LINK]'' for discussing this).

==="MP3 Player"===
http://www.microsyl.com/mp3/mp3.html
based on Atmel AVR
... The MP3 decoder is a VS1001k ...
The USB interface is done via FT232MB ...
... standard hard drive with MP3s stored in FAT
...
includes Infrared bi-directional interface
...
includes source code in C.

===Yet Another Mobile MP3 Player===
http://www.bobblick.com/techref/projects/yammp3/yammp3.html
"basically a personal computer that runs in a car"
(runs Linux)

===BookPC Car MP3 Player===
http://www.bobblick.com/techref/projects/mp3book/mp3book.html
"a computer I built for my car"
(runs Linux)

=== MP3Car ===
"MP3Car.Com - Home of the Car Computer Forums - Build your own Carputer"
http://mp3car.com/

=== MP3 Player ===
http://www.codepuppies.com/~ben/sens/pic/mp3/
(open-source hardware and software)
"the MAS3507D chip, from Micronas Intermetall, ... You simply clock a serial MP3 bitstream in one side, and digital audio gets clocked out of the other side."
So, we have
* Microchip PIC in the middle
* IDE interface (supports *both* hard drive *and* CD drive)
* MAS3507D chip ... to analog amplifiers ... out to headphone jack
* IR remote control.
* parallel port ... to PC, for downloading MP3s.

Stores the MP3s on the hard drive in a funky (but well documented) proprietary format,
to simplify the PIC playback code.

=== butterfly MP3 ===
An open design for a portable MP3 player.
It is designed to be easy / possible to make for a beginner and cheap as well.
An AVR Butterfly is used to simplify construction and minimise component count. The decoding is handled by a VS1001 decoder/DAC/amplifier.
The design supports the original Butterfly LCD as well as NOKIA 3310 cell phone displays. The project includes PCBs in eagle format for the player and also
an adapter board to replace the original LCD of the Butterfly with a BW Nokia 3310 or Color Nokia 6100 display.
The player uses MMC cards with a standard FAT16 file system.

http://butterflymp3.sourceforge.net/rev05Nokia02_TN.jpg

http://butterflymp3.sourceforge.net/

===yampp: Yet another MP-3 Player===
http://myplace.nu/mp3/

=== CarPuter ===
[http://www.nslu2-linux.org/wiki/HowTo/CarPuter NSLU2-based CarPuter]
seems to use less power than other Linux-based MP3 players. (?)

== iPod ? ==

"Open Source Hardware"
http://www.nivi.com/blog/article/open-source-hardware
"The Bill of Materials for the 30 GB Video iPod from Jefferies &
Company's Video iPod Teardown is fascinating."
http://www.tuaw.com/2005/10/19/stock-brokers-crack-open-an-ipod-5g-so-you-dont-have-to/

== discussion ==

Rather than commercially selling yet another MP3 player,
I am
more interested in commercially selling something that has almost
identical hardware, but does something that none of these do.
--[[User:DavidCary|DavidCary]] 15:28, 25 April 2006 (PDT)

----

The article
[http://www.wired.com/news/technology/0,1282,64963,00.html "High-Tech Hearing Bypasses Ears"]
by Laila Weir begins: "A wristwatch phone that lets you listen by sticking a finger in your ear, an MP3 player that vibrates the bones in your skull to play music that only you can hear ..."
So how does this "bone-conduction technology" work?

That article also mentions that "student ... Sam James created Soundwaves -- an underwater MP3 player".

-----

[http://xess.com/faq/M0000141.HTM MP3 decoding on a FPGA ?]

-----

Projects

2006-08-10T04:14:57Z

70.189.73.224: the Open Graphics Project

=== [[Programmable Chip EEG]] ===
The Programmable Chip EEG is a Multi-channel electroencephalograph that could be a brain-computer interface.

=== [[Open Mobile Gadgets]] ===
An open source, open hardware mobile phone in its preliminary development.

=== [[Music Player]]s including MP3 players ===

[[TRAXMOD]] Open source MOD music player for dsPIC/ARM microcontrollers.

=== [[PG31 GPS RS232 Dev Board]] ===
A simple RS232 example project that takes 3.3V TTL serial and outputs to a super-common RS232 connection. Insto-NMEA!

=== [[PG31 GPS USB Dev Board]] ===
A great example project using the CP2102 USB to TTL UART IC as well as some basic battery holder info.

=== [[Chalk Roach]] ===
Ultra simple microcontroller development board for Atmel ATmega32 = 16MHz, 2KB SRAM, 16KB Flash

=== LED displays ===

* [[24" Wall Clock]] A really big wall clock. Why? Well, cause it might look cool? Probably not. But we do use GPS to get the time! Groovy.

* [[POV display]] that spins around, giving the illusion of a large display. ([[User:DavidCary|DavidCary]])

=== [[Cellular Rotary Phone]] ===
An indepth breakdown of the Port-O-Rotary. Some clues to help you avoid audio problems with the GM862.

=== [[Das Brewmeister!]] ===
An attempt to wirelessly monitor temperatures of fermentation vessels

=== [[Fermenter Controller]] ===
A web available fermenter vessel controller. Uses PICs, i2c, Rs232 and python.

=== [[Home controller]] ===
Program your appliances to operate automatically in conjunction with your weekly and daily schedule, manually turn them on/off from your PC or use the controller as a process ON/OFF controller to regulate some kind of physical variable to the desired value.

=== [[Interactive Lock Box]] ===
An interesting project using an accelerometer and capacitive touch ICs.

=== [[Motor driver]] (H-bridge) ===

=== [[Atomic Microscope]] ===
An atomic-resolution microscope.
* STM (scanning tunnelling microscope)
* AFM (atomic force microscope)

=== [[BlueICE]] ===
A bluetooth JTAG ICE debugger for AVR's!!!

=== [[Sortof-Networked RFID Reader]] ===
A 125Khz RFID Reader with a simple RS232 based ring network - to allow connection of multiple units to the same control computer.

''Consider using [http://zytrax.com/tech/layer_1/cables/tech_rs232.htm#rj45 "RS-232D", aka "EIA/TIA-561"]. It has all the same wires and voltages as RS-232, but specifies a RJ45 connector.''

''Also consider RS-485.''

(What is the name of the standard for RS-485 on RJ14 ("4 wire RJ-11") or RJ45 ?)

=== Battery charger ===

See [http://elecdesign.com/Article/ArticleID/1823/1823.html "Build A Smart Battery Charger Using A Single-Transistor Circuit"] by Ejaz ur Rehman.
But be sure to read the "Reader Comments" at the end.
The suggestion to add a zener diode is a good idea.

=== the Open Graphics Project ===

[http://linux.wordpress.com/2006/07/19/introducing-the-open-graphics-project/ the Open Graphics Project]
a project started by chip-designer Timothy Miller.
His goal, along with the rest of the project, known as the “Open Graphics Foundation” is to make a 3D accelerated video card which is fully documented, free-licensed, and open source.
See [http://wiki.duskglow.com/tiki-index.php?page=Open-Graphics the Open Graphics wiki].

----

User:DavidCary

2006-04-30T23:19:03Z

70.189.73.224: PC Card FAQ: PCMCIA

Welcome to my little corner of Open Circuits.

I think I first stumbled across Open Circuits on 2006-03-01.
I had been starting to set up a electronics-related wiki,
but since this one was already here, why bother?

Feel free to leave a note on [[User_talk:DavidCary|my talk page]].

Electronic projects:

== electronics workbench ==

What exactly do I need for "normal" electronics development?
I have a pile of stuff, and I have a wishlist of more stuff ...
I hope to document which things are important to have, which things are useful but not immediately necessary, and which things ended up just gathering dust.

== data collection network ==

I'm building a "data collection network" that may end up with hundred of microcontroller sensor nodes,
piping data into a PC.
This may turn into a serious medical diagnosis tool.

== POV display ==

I'm building yet another "POV display".

I plan on putting a few features into my display that I haven't seen in any other so far:

* bright blue LEDs (even though blue is usually the most expensive color ... although
sometimes "true green" is even more expensive than blue).
* no slip rings -- just pumping energy across an air gap
* ... and a few other features that I'm keeping hush-hush.

I want lots of lumens.
Unfortunately, when I go to pick LEDs out of the catalogs, they're not
rated in lumens, they're rated in candelas.

Is it even possible to estimate "lumens" from the catalog information?

Do you know what the difference is? Does your flashlight really
produce 10 times the light ( in lumens)? Or does the flashlight merely
focus its light on a tiny spot, so that that spot gets 10 times as
many candelas ?

For example, check out these 2 LEDs:
$8.75 SSP-LX6144C7UC : 4000 mcd at 120 mA
$8.75 SSP-LX6144D7UC : 1800 mcd at 120 mA

From the mcd rating, it appears that the first one is more than 2wice
as bright -- and it is, if you're directly in front of it when you
look at it.
However, if you're even the tiniest bit off-center, the second one is
much brighter -- in fact, the total lumens that second LED puts out
(2500 mlm) is slightly more than the total lumens than the first one.
If you diffuse the light and try to light up a whole room with an
array of them, the second one will make the room brighter.

I'm currently planning on using these in my first POV display:
* $1.32 Telux TLWB7900 : blue : 330 mlm, 231 mcd at 50 mA. (price in ones from http://Newark.com/ )

Other LEDs I considered using in my POV display (and may re-consider for my next one):

* $18.89 "Lamina light engine" BL-22B1-0140 : 22000 mlm at 420 mA. (this price includes the required heat sink -- price in ones from http://Digikey.com/ ). This has the most lumens per dollar I've found so far (for blue LEDs).

* $8.750 Sunbrite LuxLEDs SSP-LX6144D7UC blue: 120 mA, 2500 mlm, 1800 mcd (Odd that the red Sunbrite LuxLEDs are cheaper at Newark, the other colors cheaper at Digikey.) cheapest $/lumen blue LED, except for the "light engine"

* $2.550 Lumex "DSP LED" 67-1876-ND: blue, 5 mm, 2500 mcd ( DigiKey ) apparently have some kind of internal chip. All colors run at 2.0 V nominal (1.5 V minimum) (rather than running on current like most LEDs. unfortunately, the data sheet doesn't suggest how much current they take -- I presume more than 20 mA).

* $1.600 Sunbrite "based LED" SSP-01TWB7UWB12 (441-1007-ND) blue 10 mm 20 mA 7000 mcd

* $5.980 GM5WA06270A SMT RGB (35 mA red, 35 mA green, 35 mA blue) 3000 mcd (full color range -- apparently used for digital camera flash ?) (Digikey)

Spoke-POV and propeller clocks links:

* An entire discussion forum devoted to POV displays http://ladyada.net.nyud.net:8090/forums/viewforum.php?f=11
** In particular, lots of nice pictures http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?p=4712
** 'no-microcontroller-programmer-needed' minipov http://ladyada.net.nyud.net:8090/forums/viewtopic.php?t=32

* Ian’s Spoke POV http://www.ianpaterson.org/projects/spokepov20050704/index.htm

* "Propeller Clock" Mechanically Scanned LED Clock: by Bob Blick http://www.bobblick.com/techref/projects/propclock/propclock.html (I think this is the original)

== Full-color LED lighting ==

I'm planning to build a silly little toy with 3 LEDs -- one for red, green, and blue --
to show how "additive colors" work (a "color wheel").
(I might just extend it to have a whole spectrum of visible and infrared LEDs, and a prism to show the little spikes in the spectrum that LEDs generate).

"Red, Green, and Blue LED based white light generation"
by Muthu, Schuurmans, and Pashley (2002)
http://www.advancetransformer.com/uploads/resources/LED_White_Light_Issues&Control_-_White_paper.pdf

LED illumination applications
http://en.wikipedia.org/wiki/Light-emitting_diode#Illumination_applications

"How Many Red, Green, and Blue LEDs to make White"
by Don Klipstein 2001
http://members.misty.com/don/ledrgb2w.html

LED Color Shifting
http://hackedgadgets.com/2006/02/14/wireless-led-color-shifting/

== "PC Card" PCMCIA ==

I maintain the
[http://david.carybros.com/html/pc_card_faq.html unofficial PC Card FAQ].

I'd like to move it to a wiki.
What would be the best wiki to put it on?
Open Circuits?

--
DavidCary