Nixie Clock #2 IN16

My second nixie clock design.
This clock is compared with my other Nixie clock much simpler, it uses less components and the code is kept simple and short.
The segments are multiplexed to increase lifetime of the tubes and simplify the 170V power supply.
Due the separate tube pcb it’s possible to use it with other tube’s. I have used IN-16 tubes for this clock, bought them on ebay.

To-do: Wooden enclosure with aluminum top and bottom.

Schematic
PlayPause
previous arrow
next arrow
Schematic
Schematic
3D Design Front
3D Design Back
Finished top pcb
Finished bottom pcb
Finished tube pcb
It's working
Result2
previous arrow
next arrow

The clock in action.

Multiplexing in action, shot with 1000fps camera

 

Icon

Eagle pcb and Bascom Source code

1 file(s) 108.58 KB
Eagle pcb cad files and bascom source code

 

view source
print?
1'============================================================================
2 
3'=  Simple IN-16 nixie tube clock with multiplexed segments, low part count =
4'=             Shortest Nixie Bascom code available on the net              =
5'=                                                                          =
6'=                    Copyright Evertdekker.com 2011                        =
7'=                    Code Created with Bascom 2.0.7.1                      =
8'============================================================================
9 
10$regfile = "M88pdef.dat"
11$crystal = 1000000                                          'Internal 8mhz div/8
12$hwstack = 32
13$swstack = 64
14$framesize = 16
15 
16Config Clock = Soft                                         'Use the softclock, 32.768KHz crystal connected to tosc1/2
17Config Date = Dmy , Separator = -
18Enable Interrupts
19Date$ = "15-03-11"
20Time$ = "12:15:45"
21 
22'== Setup hardware ==
23Digit Alias Portc
24Config Digit = Output                                       'Set up portc as output for the digit
25Ddrd = &B00111111                                           'Setup portd as output for the segment and keep bit6&7 free for other use
26Button_hr Alias Pinb.0
27Button_min Alias Pinb.1
28Config Button_hr = Input
29Config Button_min = Input                                   'Set buttons as input
30Set Portb.0
31Set Portb.1                                                 'Switch on the pullup for the buttons
32 
33Dim Multiplex As Byte
34Multiplex = 1                                               'Multiplexer starts with 1
35 
36Do
37 
38Select Case Multiplex
39 Case 1 : Digit = _sec Mod 10                               'Seconds
40 Case 2 : Digit = _sec / 10                                 'Seconds tens
41 Case 4 : Digit = _min Mod 10                               'Minute
42 Case 8 : Digit = _min / 10                                 'Minute tens
43 Case 16 : Digit = _hour Mod 10                             'Hour
44 Case 32 : Digit = _hour / 10                               'Hour tens
45End Select
46 
47Portd = &B11000000 Or Multiplex                             'Switch on one tube
48Waitms 2                                                    'Some delay to slow down the multiplexer
49 
50If Multiplex < 32 Then                                      'Shift the multiplexer one bit to the left until all 6 segments are done
51 Shift Multiplex , Left , 1
52Else
53 Multiplex = 1                                              'Start over again at segment 1
54End If
55 
56Debounce Button_min , 0 , Setminute , Sub                   'One of the buttons pressed, jump to the sub to change the time
57Debounce Button_hr , 0 , Sethour , Sub
58 
59Loop
60End
61 
62'=== Subs ===
63Setminute:
64 Incr _min
65 If _min > 59 Then _min = 0
66Return
67 
68Sethour:
69 Incr _hour
70 If _hour > 23 Then _hour = 0
71Return