Difference between revisions of "Turntable USB interface"
From Organic Design wiki
(add link to c library docs) |
(add gnu tools) |
||
| Line 53: | Line 53: | ||
=References= | =References= | ||
| + | *[http://savannah.gnu.org/search/?words=avr&type_of_search=soft&Search=Search&exact=1#options Lots of GNU tools for AVR] | ||
*[http://wiring.org.co/learning/tutorials/diagrams.html AVR diagrams] (good) | *[http://wiring.org.co/learning/tutorials/diagrams.html AVR diagrams] (good) | ||
*[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 23:38, 1 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
Operation
- Plug in USB stick or iPod
- Press record-pause
- Place stylus on a chosen track
- Signal level threshold trigger changes to record when the stylus hits the record
- Sound file is written onto the device
- Signal level threshold trigger stops recording after a few seconds pause (manual pause provided also)
Systems
- Power supply
- 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
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
Operating system
- 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
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...
