User:Wordfa/oldphonehack: Difference between revisions
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After putting everything back together, there seems to be a tone of connection issues. | After putting everything back together, there seems to be a tone of connection issues. | ||
We still have rest of the to-do list to go through | |||
[[File:Output-11.11.2024.mp3|thumb|Our first recording]] | [[File:Output-11.11.2024.mp3|thumb|Our first recording]] | ||
Revision as of 19:46, 13 November 2024
Press #1 For:
Description
From getting your BSN to installing internet in your new home to renting a car, rigid mazes of bureaucratic systems hold us all hostage. In the spirit of collective catharsis 'Press One For' invites you to share and listen to stories of how these systems frustrated you, or how you frustrated them.
Cookbook
Parts Required
USB interface to 3.5mm
https://www.adafruit.com/product/1475
3.5mm Cables
Old phone (T65)
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
- 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!
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
We now reverted back to writing the code Ralph Crutzen's way, using pygame. We pulled this code from: https://github.com/pygame/pygame/blob/main/examples/audiocapture.py
""" pygame.examples.audiocapture
A pygame 2 experiment.
* record sound from a microphone
* play back the recorded sound
"""
import pygame as pg
import time
import wave
from pygame._sdl2 import (
get_audio_device_names,
AudioDevice,
AUDIO_F32,
AUDIO_ALLOW_FORMAT_CHANGE,
)
from pygame._sdl2.mixer import set_post_mix
# sound length (seconds, a float)
SOUNDLEN = 2.0
# sound frequency (in Herz: the number of vibrations per second)
SOUNDFREQ = 1000
# maximal amplitude
MAXAMP = 32767 / 2
# sampling frequency (in Herz: the number of samples per second)
SAMPLINGFREQ = 44100
# the number of channels (1=mono, 2=stereo)
NCHANNELS = 2
pg.mixer.pre_init(44100, 32, 2, 512)
pg.init()
# init_subsystem(INIT_AUDIO)
names = get_audio_device_names(True)
print(names)
sounds = []
sound_chunks = []
def callback(audiodevice, audiomemoryview):
"""This is called in the sound thread.
Note, that the frequency and such you request may not be what you get.
"""
# print(type(audiomemoryview), len(audiomemoryview))
# print(audiodevice)
sound_chunks.append(bytes(audiomemoryview))
def postmix_callback(postmix, audiomemoryview):
"""This is called in the sound thread.
At the end of mixing we get this data.
"""
print(type(audiomemoryview), len(audiomemoryview))
print(postmix)
set_post_mix(postmix_callback)
audio = AudioDevice(
devicename=names[0],
iscapture=True,
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()
This didn't really work, just worked for us to record the sound and play it back on the handset.
We gave up on pygame and used pyaudio. Fred found this snippet of code which we will try to translate into our test.py:
import RPi.GPIO as gpio
from recorder import Recorder
gpio.setmode(gpio.BCM)
class ButtonRecorder(object):
def __init__(self, filename):
self.filename = filename
gpio.setup(23, gpio.IN, pull_up_down=gpio.PUD_UP)
self.rec = Recorder(channels=2)
def start(self):
gpio.add_event_detect(23, gpio.FALLING, callback=self.falling, bouncetime=10)
def rising(self, channel):
gpio.remove_event_detect(23)
print 'Button up'
gpio.add_event_detect(23, gpio.FALLING, callback=self.falling, bouncetime=10)
self.recfile.stop_recording()
self.recfile.close()
def falling(self, channel):
gpio.remove_event_detect(23)
print 'Button down'
gpio.add_event_detect(23, gpio.RISING, callback=self.rising, bouncetime=10)
self.recfile = self.rec.open(self.filename, 'wb')
self.recfile.start_recording()
rec = ButtonRecorder('nonblocking.wav')
rec.start()
try:
raw_input()
except KeyboardInterrupt:
pass
gpio.cleanup()
We managed to get a recording with this code:
We made a first recording with this. (We were discussing if having a limited time to record is okay instead of hanging the phone to stop recording and its a second of that convo)
We combined these 2 snippets together but had errors, we had to install a bunch of audio related python scripts and Joseph told us to download sox (in his words: Swiss army knife Audio python scripts) :
sudo apt install sox
We had to do some troubleshooting for sox because it also didn't work perfectly of course.
To do list from 13/11/2024 on:
- discuss the intro in detail : maybe a connecting sound(?) at first, then hold music, then intro, then press 1 for: etc, beep sound before the recording, etc. , before the recording: disclaimer,
- decide whether we have different audios for each pickup
- what is the detailed version of the 'annoying' bureaucratic protocol? make it a detailed question.
- discuss decor after the giveaway shop visit
- collect forms / print forms
- (eventually) make the pi go into the phone and fix the wiring (take everything out, solder the wires, )
13/11/2024
We went to the weggeefwinkel to grab some office related decor. Which was amazing, we got a desk lamp, plastic transparent folder, an old picture of some business people and a frame to go with it and a briefcase to put them all in.
Today everything went wrong... We discovered that the little metal tabs need to be warmed up by the solder machine and then get a bit of lead on them to make them work. Joseph told us we need to let the machine warm up the tabs until they are both ~325 °C, then let some solder into the tab. After the warm up, the solder should stick to the tab. Martina tried really hard and managed to connect 3 wires (without knowing any of this), Fred and Sevgi couldn't manage the other and gave up on that. We wired everything with different ways and took the case off of the pi to make it fit inside the telephone.
We took out the bells to be used in the jam session.
Fred cleaned the rotary part and the spiral came out which took him forever to put back. Eventually he figured out it is easier to attach the inner bit and then coil the rest of the spiral inside. Now the rotary is clean and it works smoother.
After putting everything back together, there seems to be a tone of connection issues.
We still have rest of the to-do list to go through
Refs and resources
Microphone from handset
https://www.youtube.com/watch?v=rIkIkbOw3OQ&t
Rotary Pi
- Really good write up with code:
- https://marks.kitchen/blog/rotary_phone_running_linux/
- Linking Video
- https://www.youtube.com/watch?v=M4eCrctDMEc
Lofi Mic
https://www.youtube.com/watch?v=7gorBkdk8zY
Schematic (v scary)
https://easyeda.com/editor#id=7d0350ec43844219912695cec1a0e156
Rotary MP3 Player
https://www.whizzbizz.com/en/gpo746-t65-rotary-dial-phone-mp3-wav-player
Info on the T65
https://www.cryptomuseum.com/phone/t65/index.htm(there is a wire list here as well)
Carbon Mic
https://www.youtube.com/watch?v=cwPPoVvljOw
https://www.youtube.com/watch?v=pb-Lu2kzKYc&t=221s
Dutch guide on rotary dail
https://github.com/ralphcrutzen/PTT-Tafeltjes-Telefoon?tab=readme-ov-file
Guide on getting Keypad Working (Matrix should be tried)
https://web.archive.org/web/20130919160654/http://www.keesvanweert.nl/blog/?p=1
Weird Stuff
how does a carbon mic work
https://wonderfoon.jimdosite.com/
https://www.youtube.com/@ruudshangout/search?query=t65
Event Rider:
Items Needs
- Table [ ] - from XPUb studio
- Chair [ ] - WORM
- Phone [x]
- Lamp [ ] - Fred has a lamp
- Calendar [ ]
- Forms on table? [ ]
- Assorted Desk Items [ ] - from giveaway shop - bring the cups from studio
Space Needs
- 2m x 2m (UBIK)
- Power (UBIK)
- Low light preferred
Time Needs
- Async/ All day