Difference between revisions of "Turntable USB interface"
From Organic Design wiki
m (→Systems) |
m (Caretaker: categories) |
||
| Line 1: | Line 1: | ||
| − | [[Category:Hardware]] | + | [[Category:Hardware]][[Category:USB turntable]] |
I would like to retro-fit my 1970's pioneer turntable to be able to record onto a iPod or other USB device. | I would like to retro-fit my 1970's pioneer turntable to be able to record onto a iPod or other USB device. | ||
| Line 80: | Line 80: | ||
*[http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply Custom power supply project] | *[http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply Custom power supply project] | ||
*[http://www.hynet.umd.edu/research/atemu/downloads.html Good links and downloads] for emulators, libc... | *[http://www.hynet.umd.edu/research/atemu/downloads.html Good links and downloads] for emulators, libc... | ||
| − | |||
Revision as of 16:52, 10 February 2007
I would like to retro-fit my 1970's pioneer turntable to be able to record onto a iPod or other USB device.
Contents
Why?
Because I like to combine technology in unusual ways. And also to bring together analog and digital without a computer getting in the way.
There is a microcomputer involved however.
Operation
- Indicator light is off
- Plug in USB stick or iPod
- Indicator light is green to indicate all is well - iPod or memory stick is detected
- Place stylus on a chosen track
- Press button
- Indicator light is red for record
- You will also see the activity light on the USB device light
- Sound file is written onto the device in WAV/AIFF format
- Press button
- Recording stops and file is closed
- Indicator light is green
- You can press the button to begin recording again to a new file
- Unplug device (only when light is green - your risk if you unplug on red)
- Indicator light goes out
Systems
- Power supply
- Indicator LED and bezel
- plug pack 12V 100mA
- Split from it's case and wired in parallel on the AC side of the turntable's main transformer
- Analogue phono stage (requires ±12V DC)
- to be build on veroboard
- ICSP programmer required to completely rewrite the bootloader - AVRISP mkII
Microcontroller
Blackfin- Arduino NG AVR microprocessor board
- Schematics
Features
- ATmega168 AVR processor
- Digital <-> Analogue converter
- C library and compiler supplied as open source
- AVR emulator
- AVR libC
Board
- 78MO5 voltage regulator
- FT232R USB to serial driver
- S16B0016 clock
- USB D-type connector
Operating system
- Implementing USB 1.1 in AVR assember
- gcc, libc supplied and open source
- No real operating system required
- svn tree
- bootloader supplied and open source
- libipod [tar] program to modify iPod's XML playlist file to add the newly created track to the playlist
- ContikiOS
Main loop
- boot up
- USB device?
- loop
- yes-mount fs and open file descriptor
- no-loop
- set led to Red
- loop
- check A to D for signal input
- check threshhold
- begin recording
- or
- loop
- begin recording
References
- Lots of GNU tools for AVR
- AVR diagrams (good)
- Custom power supply project
- Good links and downloads for emulators, libc...
