[GreenKeys] Fwd: Old Dog with some New Tricks.

Wed Aug 28 22:46:18 EDT 2024

The RazPi has been an adventure for me. I always wondered why there was 
little information for using the gpio pins that came on the many mini 
itx motherboards I've used all these years. Now I know what I can do 
with them. The RazPi comes with many informative internet sources and 
helpful pieces of code. There is not much you can't do with them in 
software. I will provide much of the software I've assembled eventually 
on my website.

Now a progress report: It's been tough, but oday I was able to get my 
Python coded fsk-gpio pins working which eventually be able to key a 
loop with an optical SSR relay. I have two gpio pins following the fsk 
tones from ITTY and from text/image files. Presently they are only 
flickering LEDs, but I will add some circuitry for a 60ma loop. Also I 
have two more gpio pins to simultaneous create PWM tone outputs with a 
170 shift of 2125/2295 and 850 shift 1575/2425. A little bit of RC 
filtering should make these suitable for our needs.

I am concerned about latency. I'm only able to test on an M15. But I'm 
thinking that 100WPM should work, too.

Any suggestions for additional M/S pairs? I haven't looked at user 
configuration options yet, but I will eventually add to the code to make 
it flexible.

73, John W!AN
--------------------------

Hey John -

This all sounds really cool.  Don't know why I never thought of using BT 
to talk to my TU.  I'm constantly tripping over the audio cable from my 
PC to the TU.  Duh.

Anyway, I have no experience with the Raspberry Pi, but this might be a 
good way to get into it.  Can you make (or do you already have) your 
project documentation/code available publicly?  It sure sounds like a 
neat package.  I'd love to try it with my M15 and ST-5000.

Cheers,
Keith

On Monday, August 26, 2024 at 03:53:43 AM GMT+1, John Spigel 
<w1an.dxusa at gmail.com> wrote:

I thought I'd pass on a quick way to access ITTY and other streaming
audio sources.

I've been developing several Python packages for TTY use on the
Raspberry Pi. To make my tests across the room to my M15 I've been using
bluetooth. Yes, the same bluetooth that's on your smartphone. Any audio
streaming will play well from your phone including the familiar music
from ITTY. No PC needed.

So what do you need?.. A small bluetooth audio module with a big price
tag of two for $6.99. If you want 5, that'll be $10.99, please.

Amazon description:

"MakerHawk 2pcs Bluetooth Audio Receiver Board BT 5.0 Stereo Audio
Amplifier 3.7-5V Car Speaker Amplifier for DIY"

You'll also need a 5V power supply with usb-c connector or cable, if you
look close you can see solder pads on the device where wires can be
tacked on. You probably already have a 1/8" audio patch cable and
adapter to connect to your TU.

Just pair the device with your phone power up your gear and your good to
go.

OK, Now the projects:
I wanted to make demonstrations easier with my M15. So I made a portable
cart with casters to make moving easier. This can be disassembled and go
in the car. The "TU" is The Deramps Interface. The audio source can be
either a local Raz Pi, or optionally bluetooth from a phone for ITTY.
That's a fairly simple setup. No screen necessary. All the devces are
velcroed to the rear of the cart along with a powerstrip.

The key to all of this is the Python code. The Raz Pi is headless. Three
miniature, think C&K, ON-OFF-ON switches control up to 27 audio internet
streams or .pix and .pox image files saved on the PI. The code reads the
pseudo-binary on the Pi's GPIO pins and selects the source by shell
scripts for each! When active there is an output GPIO pin for a relay.

Also, I have a Python Text formatter in the works  the Pi. This is to
help make text files ready for baudot. It will take mixed text files
scanned off the internet, news sources, Wikipedia, etc.. I hope to
eventually use OCR to grab old articles, stories, from archives efficiently.

I have: Line length selectable, word wrap with automatic CR/LF
insertion. Options to Replace LF with Space, LF with CR/LF, a Second CR,
Letters after Space. Also insertion of a choice of Headers and Footers.
I'm still trying to break it to see what bugs may develop. I've also got
it saving the 00011, 01100, etc to a ".5bit" file. That's the best way
to see the edits along with the text. And I may just use this to run
GPIO pins.

Another in the works. Raz Pi with "Polar output" on two GPIO pins and
one GPIO output pin for Autostart when FSK is active. Just add some
external parts to drive a loop.

Too much to do. So little time. At my age.

73, John W1AN

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