[GreenKeys] Raspberry pi

epvgk at limpoc.com epvgk at limpoc.com
Mon Jan 11 15:04:39 EST 2021 

On Mon, Jan 11, 2021 at 01:51:23PM -0600, John, W9DDD wrote:
> I've done this with a Linux PC and I have several Pies, so I was just
> looking to see is anyone has been able to either use the Volpe board or
> other way of getting actual serial bits out of the Pi.
> 
> John, W9DDD

Yeah, it works fine for me. I use mplayer to play the itty stream and
a straight-through audio cable from the pi to the demod board. 

mplayer http://internet-tty.net:8000/ITTY

If you don't want to go to analog FSK audio and back to bits, you can do 
the demodulating in software on the pi itself and then send the ascii data to 
a loop via a USB-tty interface: 

curl -N -s http://internet-tty.net:8000/ITTY | lame --decode --quiet --mp3input - - | minimodem rtty -i -a -q --rx-one -R 11025 -f /dev/ttyACM0

Of course you can also use fldigi or whatever as well if you want a GUI. I think 
it has an option to write decoded text to a file, which you can then "tail -f" and
redirect into a usb interface or something else. 

> 
> On 1/11/2021 1:42 PM, Paul Heller wrote:
> > In my case, because I wanted to use the TU, the Raspberry PI captures
> > the ITTY stream, decodes it and sends it out its audio port (jack). That
> > is then fed into a TU.
> > 
> > When I set mine up, I used MPD (music player daemon) and daemontools-run
> > to automatically start PMD each time the Raspberry PI was plugged in.
> > 
> > As Duncan said, it can be set up with your wifi credentials or just used
> > a wired Ethernet connection.
> > 
> > If there is interest, I could make a few SD cards available for sale at
> > cost, set up and ready to go. You would have to furnish the raspberry PI
> > and case. I could set things up so the default stream is ITTY, and if
> > you want to invest in a momentary push button and an LED you could
> > switch to the other streams. I won’t be able to work on this until late
> > February, however, due to other commitments.
> > 
> > Someday I am going to try using one of those small LCD screens on the PI
> > to display what feed is being played.
> > 
> > Paul
> > W2TTY
> > 
> > ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY <HTTP://internet-tty.net:8000/ITTY>
> > AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
> > <HTTP://internet-tty.net:8030/AUTOSTART>
> > EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE
> > <HTTP://internet-tty.net:8040/EUROPE>
> > 
> > > On Jan 11, 2021, at 8:17 PM, John, W9DDD <w9ddd at tapr.org> wrote:
> > > 
> > > So are you these to get audio out to a TU, or some other way to
> > > drive the printer.  Possibly fldigi and running into a Volpe board
> > > and skipping audio out.
> > > 
> > > I can certainly see using a Pi separate from the PC, since anytime I
> > > bump the mouse on the PC, the printer skips a beat.
> > > 
> > > John, W9DDD
> > > 
> > > On 1/11/2021 9:20 AM, Paul Heller wrote:
> > > > I have a made and given away a few raspberry PIs to receive the
> > > > various ITTY stations. Over time they began to work better, but
> > > > all versions (the first ones were pretty crude) have the same
> > > > basic features: a momentary push button to change the channels
> > > > among the ITTY channels and a flashing LED that indicates what
> > > > channel is being listened to. It was all driven by python and
> > > > gave me a chance to experiment with the PI and provide something
> > > > useful.
> > > > They all run headless without the need for a keyboard or display.
> > > > If you only want one ITTY channel, you don’t need the push
> > > > button nor the LED.
> > > > Have fun!
> > > > Paul
> > > > W2TTY
> > > > > On Jan 11, 2021, at 3:51 PM, Duncan Brown
> > > > > <duncanancy at earthlink.net> wrote:
> > > > > 
> > > > > RasPi works great for bringing in ITTY for your TTYs!
> > > > > 
> > > > > The AWA Museum has one (thanks to Paul, W2TTY) for copying
> > > > > the main ITTY stream. It powers up when we turn on the TTY
> > > > > display, connects to our WIFI, and in a few seconds is
> > > > > providing AFSK background "music". It also drives a Dovetron
> > > > > (with real CRT display). Whenever we want to show a TTY in
> > > > > action, we just take the Dovetron out of standby and start
> > > > > printing ITTY.
> > > > > 
> > > > > At the end of the day, we just kill all the power to the
> > > > > display. It does not seem to bother the RasPi to be shut
> > > > > down that way.
> > > > > 
> > > > > Have fun,
> > > > > 
> > > > > Duncan
> > > > > K2OEQ
> > > > > 
> > > > > 
> > > > > > On 10-Jan-21 18:58, Daniel Jones wrote:
> > > > > > I have just acquired a RPi that is set up to feed my
> > > > > > machine the autostart channel.  It’s a heck of a lot
> > > > > > easier then leaving my computer hooked up all the time.
> > > > > > 
> > > > > > Gary Lopes WA6MEM set it up.  We are planning on using
> > > > > > the same thing at the battleship Iowa to have allow the
> > > > > > teletypes to occasionally operate while tours are going
> > > > > > on.
> > > > > > 
> > > > > > Daniel
> > > > > > 
> > > > > > K6YIC
> > > > > > http://K6YIC.com
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> > > > > 
> > > > > > > > Jordan Spencer Cunningham's GreenKeys Search
> > > > > > > > Tool: https://teletype.net/gksearch
> > > > > > > > 2002-to-present greenkeys archive:
> > > > > > > > http://mailman.qth.net/pipermail/greenkeys/
> > > > > > > > 1998-to-2001 greenkeys archive:
> > > > > > > > http://mailman.qth.net/archive/greenkeys/greenkeys.html
> > > > > > > > Randy Guttery's 2001-to-2009 GreenKeys Search
> > > > > > > > Tool:
> > > > > > > > http://comcents.com/tty/greenkeyssearch.html
> > > > > 
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> > > > > > > Jordan Spencer Cunningham's GreenKeys Search Tool:
> > > > > > > https://teletype.net/gksearch
> > > > > > > 2002-to-present greenkeys archive:
> > > > > > > http://mailman.qth.net/pipermail/greenkeys/
> > > > > > > 1998-to-2001 greenkeys archive:
> > > > > > > http://mailman.qth.net/archive/greenkeys/greenkeys.html
> > > > > > > Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> > > > > > > http://comcents.com/tty/greenkeyssearch.html
> > > > This list hosted by: http://www.qsl.net
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> > > 
> > > > > > Jordan Spencer Cunningham's GreenKeys Search Tool:
> > > > > > https://teletype.net/gksearch
> > > > > > 2002-to-present greenkeys archive:
> > > > > > http://mailman.qth.net/pipermail/greenkeys/
> > > > > > 1998-to-2001 greenkeys archive:
> > > > > > http://mailman.qth.net/archive/greenkeys/greenkeys.html
> > > > > > Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> > > > > > http://comcents.com/tty/greenkeyssearch.html
> > > 
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> ______________________________________________________________
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> 
> > > > Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
> > > > 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> > > > 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> > > > Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
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