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Description

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T65 Rotary Phone bought by Sevgi n' Fred

Cookbook

Parts Required

USB interface to 3.5mm

https://www.adafruit.com/product/1475

3.5mm Cables

Old phone (T65)

https://www.marktplaats.nl/v/telecommunicatie/vaste-telefoons-niet-draadloos/m2158407457-ptt-t65-goed-werkende-nostalgische-telefoon

Raspberry Pi

TRS 3.5 Jack x2

Loads of wires

old headphones with a mic (apple earpod works best)

Things we done

- We got one phone from ScrapXL Rotterdam and one from Marktplaats. The first one was a T65

[11 (Neg), 12(Pos) speaker output]

We

- We took the phone apart and got the speaker to work by connecting the blue and red cables from the phone out to the audio jack to the soundcard to the computer. played show me the body, was good.

- Then we tried the microphone but its a carbon mic and it didnt work. so we atttached a battery and hoped. didnt work.

- We took apart wired headphones that had mic in them to see if we could use the mic from it rather than the carbon mic in the telephone.-> didnt work, headphone cable is TRRS not TRS:

spent a day trying to wire up TRRS to an audio cable, turns out the audio jack was the wrong kind.

then wired it directly to a TRS jack, worked!!!!!!!!!!!!!

then cable managed, looks beautiful now. now we have working speakers and working mic.

This is how you could make it work too (Schema 1)

From the headphones you need to...

Connect th Blue (Ground) to the Sleeve of the TRS jack

Connect the Red (mic) to Pin (Ring) 1 or 2 of the TRS jack

MAKE SURE THE HEADPHONES CONNECTION IS CLOSED!

The wiring used

sketch of the wiring of the handset connection (Schema 1)

Next Steps:

We need to work out how to read the keypad input on the raspberrypi. Mark Powers has a snippet of code that supposedly works with this: https://marks.kitchen/blog/rotary_phone_running_linux/

To test our phone we used this GitHub project: https://github.com/ralphcrutzen/PTT-Tafeltjes-Telefoon?tab=readme-ov-file. > This project turns the phone into a math game where a child asks you a times table question and you are supposed to give the correct answer using the rotary keypad. When you dial the answer the py code reads it as 2 separate entires and gives you a Goed zo! if you gave the correct answer.

Fred is translating the code to eng. He also thinks I can't do times tables.

Set up the raspberrypi, named it telephone.(tut here:https://nematicslab.com/how-to-enable-ssh-without-using-a-monitor/)

Fred made me a user(Sevgi) as well and we tested the connections first, adjusted the code accordingly. Fred tested the connections like this (this is the final working version):

import RPi.GPIO as GPIO


GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(24, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(25, GPIO.IN, pull_up_down = GPIO.PUD_UP)

while True:
        
        print('-')
        if GPIO.input(23):
                print('23')
        if GPIO.input(25):
                print('25')
        if GPIO.input(24):
                print('24')

Here is how we set up the wires and the raspberry pi:

This wiring worked for us at first, but then we had to put the ground cables in different Rbpi GND's for it to work again.

Here is the eng version of the dutch code: https://pzwiki.wdka.nl/mediadesign/User:Wordfa/oldphonehack/PTT_Tafeltjes_Telefoon

Fred wrote down a test code which we now lost...

Last login: Mon Nov 11 18:05:41 on ttys000
designworm@Designs-MBP ~ % ssh sevgi@192.168.1.113
sevgi@192.168.1.113's password: 
Linux telephone 6.6.51+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.51-1+rpt3 (2024-10-08) aarch64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Nov 11 17:49:30 2024 from 192.168.1.158
sevgi@telephone:~ $ exit
logout
Connection to 192.168.1.113 closed.
designworm@Designs-MBP ~ % ssh wordie@192.168.1.113
wordie@192.168.1.113's password: 
Permission denied, please try again.
wordie@192.168.1.113's password: 
Linux telephone 6.6.51+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.51-1+rpt3 (2024-10-08) aarch64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Nov 11 17:46:47 2024
wordie@telephone:~ $ cd
wordie@telephone:~ $ ls
Bookshelf  Documents  Music     Public     Videos
Desktop    Downloads  Pictures  Templates  telephone
wordie@telephone:~ $ cd telephone
wordie@telephone:~/telephone $ ls
"08 I DON'T WANT TO FALL IN LOVE AGAIN.wav"   markOne.py   rotary_pi
'Sunday Morning Maroon 5.mp3'                 markTwo.py   test.py
wordie@telephone:~/telephone $ nano test.py
wordie@telephone:~/telephone $ nano test.py
wordie@telephone:~/telephone $ ls
"08 I DON'T WANT TO FALL IN LOVE AGAIN.wav"   capture.py   markTwo.py   test.py
'Sunday Morning Maroon 5.mp3'                 markOne.py   rotary_pi
wordie@telephone:~/telephone $ nano capture.py
wordie@telephone:~/telephone $ nano test.py
wordie@telephone:~/telephone $ nano capture.py

  GNU nano 7.2                       capture.py                                 
    frequency=44100,
    audioformat=AUDIO_F32,
    numchannels=2,
    chunksize=512,
    allowed_changes=AUDIO_ALLOW_FORMAT_CHANGE,
    callback=callback,
)
# start recording.
audio.pause(0)

print(audio)

print(f"recording with '{names[0]}'")
time.sleep(2)


print("Turning data into a pg.mixer.Sound")

sound = pg.mixer.Sound(buffer=b"".join(sound_chunks))
snd = pg.mixer.Sound(sound)

# open new wave file
sfile = wave.open('pure_tone.wav', 'w')

# set the parameters
sfile.setnchannels(NCHANNELS)

# write raw PyGame sound buffer to wave file
sfile.writeframesraw(snd.get_raw())

# close file
sfile.close()

print("playing back recorded sound")
sound.play()
time.sleep(2)
pg.quit()


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