Difference between revisions of "Coinvox 22"

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(keypad and display update)
(added snippets of information everywhere. added image. small typo fixes)
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|Description=Get an old payphone to work again
 
|Description=Get an old payphone to work again
 
}}
 
}}
−
[[Image:Coinvox 22 front.jpg|thumb|185px]][[Image:Coinvox 22 inside.jpg|thumb|185px]]
+
[[Image:Coinvox 22 front.jpg|thumb|185px|Coinvox 22 looks complete..]]
 +
[[Image:Coinvox 22 inside.jpg|thumb|185px|..but is stipped empty :(]]
 +
[[Image:Coinvox 22 keypad.jpg|thumb|185px|Keypad I<sup>2</sup>C interfaced]]
 
== synopsis ==
 
== synopsis ==
 
I got myself a Coinvox 22, reasonably cheap.
 
I got myself a Coinvox 22, reasonably cheap.
−
The downside is: the inner workings have been stripped out, so it's just a metal box with keypad and display, a handset with hookswitch and a smalltransformer.
+
The downside is: the inner workings have been stripped out, so it's just a metal box with keypad and display, a handset with hook-switch and a small transformer.
  
 
No coin mech, no ringer, no phone.
 
No coin mech, no ringer, no phone.
  
 
== inside ==
 
== inside ==
−
=== handset / hookswitch ===
+
=== handset / hook-switch ===
−
* 2 differend reed switches
+
The handset is tested and is in good shape. It is connected to a PCB.
 +
* 2 different reed switches
 
* 4 coils
 
* 4 coils
−
* 2 3-pin SOT 23 (smd) diodes(?) (D1, D2: A7 P 45)
+
* 2 3-pin SOT 23 (SMD) diodes(?) (D1, D2: A7 P 45)
  
 
'''J1'''
 
'''J1'''
 +
Handset connector. Layout is (male) PCB connector side.
 
  |o  spk
 
  |o  spk
 
  |o| mic -
 
  |o| mic -
Line 24: Line 28:
  
 
'''J2'''
 
'''J2'''
 +
Connector which ought to go into the main PCB. Layout is (female) connector side.
 
  mic+ 2 |oo| 1 spk
 
  mic+ 2 |oo| 1 spk
 
   spk 4 |oo| 3 mic-
 
   spk 4 |oo| 3 mic-
Line 30: Line 35:
 
   P2 10|oo| 9 NO2
 
   P2 10|oo| 9 NO2
  
−
Note: SW1 switches first (about 2mm) when hanging up
+
Note: SW1 switches first (about 2mm) when hanging up, probably used for muting the microphone.
  
 
=== keypad / display ===
 
=== keypad / display ===
Line 38: Line 43:
  
 
'''J'''
 
'''J'''
 +
Display/keypad connector. Layout is (female) connector side. Int needs pullup, and print is found working at 5V.
 
  SCL 2 |oo| 1 SDA
 
  SCL 2 |oo| 1 SDA
 
     4 |oo| 3  
 
     4 |oo| 3  
Line 45: Line 51:
  
 
'''Display'''
 
'''Display'''
−
* 8 &times; 14 segment display, charachters are filles from the right
+
* 8 &times; 14 segment display, characters are filled from the right
 
* 52 pins with the only the outer 9 connected (36)
 
* 52 pins with the only the outer 9 connected (36)
−
* uses 4 backplane mode (all corners)
+
* uses 4 back-plane mode (all corners)
  
−
Segment layout
+
Segment layout. Note that bit 3 is not used, which aligns the characters to 16 bit.
 
<pre>
 
<pre>
 
       15
 
       15
−
  _________  
+
    _________  
 
   
 
   
 
   | \11 |  / |
 
   | \11 |  / |
Line 63: Line 69:
 
   __________
 
   __________
 
         0      o12
 
         0      o12
−
  pin 3:N/C
+
  bit 3: not used
 
</pre>
 
</pre>
  
Line 102: Line 108:
 
To read out the keypad (on interrupt pullup), set one row low and read the column nibble. Repeat for each row. Low bit means key pressed.
 
To read out the keypad (on interrupt pullup), set one row low and read the column nibble. Repeat for each row. Low bit means key pressed.
  
−
 
+
Text on the PCB:
 
:LGCO-CH BTC15 DESKII
 
:LGCO-CH BTC15 DESKII
 
:4 431 4223 0 22
 
:4 431 4223 0 22
  
−
Sticker
+
Text found on some stickers:
 
:Landis & GYR
 
:Landis & GYR
 
:412197580 A
 
:412197580 A
 
:Version.mec: A
 
:Version.mec: A
−
Date fab : 02/95
+
:Date fab : 02/95
  
 
== plans ==
 
== plans ==
Line 119: Line 125:
  
 
== todo ==
 
== todo ==
−
* identify ICs, obtain datasheet, determine pinouts
+
* upload display/keypad initialization commands
 +
* write a library for the display/keypad (fix the hacky code)
 +
* see if the serial protocol of a Cisco phone is of any use
 +
* find an old mechanical phone bell
 +
* <s>identify ICs, obtain datasheet, determine pinouts</s> Success!

Revision as of 11:35, 26 October 2015

Project: Coinvox 22
Featured:
State Active
Members xopr
GitHub No GitHub project defined. Add your project here.
Description Get an old payphone to work again
Picture
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Coinvox 22 looks complete..
..but is stipped empty :(
Keypad I2C interfaced

synopsis

I got myself a Coinvox 22, reasonably cheap. The downside is: the inner workings have been stripped out, so it's just a metal box with keypad and display, a handset with hook-switch and a small transformer.

No coin mech, no ringer, no phone.

inside

handset / hook-switch

The handset is tested and is in good shape. It is connected to a PCB.

  • 2 different reed switches
  • 4 coils
  • 2 3-pin SOT 23 (SMD) diodes(?) (D1, D2: A7 P 45)

J1 Handset connector. Layout is (male) PCB connector side. 

|o  spk
|o| mic -
|o| mic +
|o  spk

J2 Connector which ought to go into the main PCB. Layout is (female) connector side. 

mic+ 2 |oo| 1 spk
 spk 4 |oo| 3 mic-
 NC1 6 |oo |5 n/c
 NO1 8 |oo| 7 P1
  P2 10|oo| 9 NO2

Note: SW1 switches first (about 2mm) when hanging up, probably used for muting the microphone.

keypad / display

  • IC2: PCF8576T (Universal LCD driver for low multiplex rates, I2C address 38h)
  • IC3: PCF8574T (Remote 8-bit I/O expander for I2C-bus with interrupt)
    Addresses tied to ground; address 20h.

J Display/keypad connector. Layout is (female) connector side. Int needs pullup, and print is found working at 5V. 

SCL 2 |oo| 1 SDA
    4 |oo| 3 
GND 6 |oo |5 VCC
    8 |oo| 7 
Int 10|oo| 9

Display

  • 8 × 14 segment display, characters are filled from the right
  • 52 pins with the only the outer 9 connected (36)
  • uses 4 back-plane mode (all corners)

Segment layout. Note that bit 3 is not used, which aligns the characters to 16 bit. 

       15
    _________ 
 
  | \11 |   / |
 2|  \  |7 /6 |14
  |   \ | /   |
 10----  -----5
  |   / | \   |
 1|  /  |  \4 |13
  | /9  |8  \ |
   __________
        0       o12
 bit 3: not used


Keypad

col1 (P7) col2 (P4) col3 (P5) col4 (P6)
row1 (P1) n/c 1 2 3
row2 (P1) n/c 4 5 6
row3 (P2) N 7 8 9
row4 (P3) Vol * 0 #

To read out the keypad (on interrupt pullup), set one row low and read the column nibble. Repeat for each row. Low bit means key pressed.

Text on the PCB:

LGCO-CH BTC15 DESKII
4 431 4223 0 22

Text found on some stickers:

Landis & GYR
412197580 A
Version.mec: A
Date fab : 02/95

plans

  • upload reference material of the Coinvox phones (hacktic, 't klaphek, telephone museums ([1][2][3][4][5][6][7])
  • experiment with my (front fed) coin mech (or look for a top fed mech that fits)
  • experiment with a cisco phone (see if I can use the softkeys and the AUX port to read quarters or just Euro coins
  • connect an ATA to an old phone

todo

  • upload display/keypad initialization commands
  • write a library for the display/keypad (fix the hacky code)
  • see if the serial protocol of a Cisco phone is of any use
  • find an old mechanical phone bell
  • identify ICs, obtain datasheet, determine pinouts Success!
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