GitHub - rschlaikjer_in12-wifi_ Nixie clock with IN-12s with NTP support.pdf

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Nixie clock with IN-12s with NTP support
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on Sep 10, 2017
README.md
Wifi-enabled clock with IN-12 nixies
Nixie clock that synchronizes over Network Time Protocol
Relatively simple Nixie clock, but with an automatic time detection twist. On boot, and then
every hour after, the clock will synchronize with a network time server to ensure that it is still
correct. No need to manually set the time, no need to worry about RE-setting the time for
daylight savings. The core components are the MCU (ATMEGA328P), WiFi chipset
(ATWINC1500) and boost converter for the nixie tubes (MAX1771).
This project builds on a
previous clock
, which was also NTP-powered but required a wired
internet connection. After the ethernet chipset on that clock died after a few years
continuous service, I resolved to build a second generation design with two improvements -
a seconds place, and wifi enabled to avoid yet another cable snaking across the desk.
The design is split into three PCBs:
The control board has three sections - one for the boost logic (12V -> 170V), one for
the wifi logic (at 3.3V), and one for the MCU itsef at 5V.
The shift register board, middle, simply converts the serial output from the MCU on the
control board into a parallel output enabling various sinks on the nixie pins through
MPSA42 transistors.
The front PCB simply breaks the nixie pins out into even rows at the edges, so that it
meshes well with the shift register board. Dealing with routing the shift registers,
current limiting resistors and transistors all on the same board as the nixies was too
troublesome compared with simply adding another layer.
BOMs
Control board
Part
C1
C2
10uF
10uF,25V
Value
CAP0805
CAP_POLPTH2
Device
Package
0805
CPOL-
RADIAL-
10UF-25V
CPOL-
RADIAL-
10UF-25V
CAP-PTH-
SMALL
CAP-PTH-
C3
10uF/250V
CAP_POLPTH2
C4
C5
100n
100n
CAPPTH
CAPPTH
Part
Value
Device
Package
SMALL
C6
C7
100nF
10nF
CAP0805
CAP0805
0805
0805
C8
CPOL-USE2,5-6E
E2,5-6E
C9
CPOL-USE2,5-6E
E2,5-6E
CPOL-
C10
C11
C12
C13
C14
100uF,35V
100nF
22pF
22pF
10uF
CAP_POLPTH2
CAP0805
CAP0805
CAP0805
CAP0805
RADIAL-
10UF-25V
0805
0805
0805
0805
C15
CPOL-USE2,5-6E
E2,5-6E
C16
10uF
CAP0805
0805
C17
CPOL-USE2,5-6E
E2,5-6E
D1
FTDI
H1
H2
1N4007
1N4004
ARDUINO_SERIAL_PROGRAMPTH
DO41-10
1X06
STAND-OFF
STAND-OFF
STAND-OFF
STAND-OFF
STAND-OFF
STAND-OFF
Part
H3
H4
IC1
Value
STAND-OFF
STAND-OFF
7805T
STAND-OFF
STAND-OFF
7805T
Device
Package
STAND-OFF
STAND-OFF
TO220H
IC3
ATWINC1500
ATWINC1500
ATWINC1500-
MR210
IC4
LD117AV33
LD117AV33
TO220L1
ISP1
J1
AVRISP-6
AVRISP-6
M04PTH
AVRISP
1X04
J2
M02PTH
1X02
J7
M02PTH
1X02
J9
M02PTH
1X02
L1
LED_ACT
100uH
L-SMT-POWER-B82479
LED0603
L-B82479
LED-0603

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