Aug 03 2007
Some time ago I decided to build a nixie clock. Robert will do the design of the clock. Because he uses AVR microcontrollers I already made an AVR programmer.
For the nixie clock I have made a “high voltage” power supply. This is based on the well known circuit, but I adapted it with an enable input.
(If the enable pin is high the power supply stops, the pin can be left floating without problems)
The pcb layout: PDF with components; PDF without components
Aug 26 2007
Yesterday I received my nixies (Thanks Robert and Pascal!), today I started experimenting with them.
Datasheet:
The socket:
Sep 02 2007
Today I have made a drawing of how the clock is going to look like:
Mar 29 2009
I decided that I’m not going to wait for Robert to have time to make the code and circuit diagram any longer. So I designed something myself. The clock works with a PIC16F628A, the time is kept with a DS1307 and the temperature is measured with a TC74. I have used a couple of 74HC595 ic’s because the 16F628A doesn’t have enough IO pins. This way I create 8 outputs extra per connected 74HC595. I used those outputs to drive the nixie drive ic’s and the transistors that drive the neon’s.
Picture of the pcb:
Video of the clock working:
The code:
Device 16F628A Config INTRC_OSC_NOCLKOUT, WDT_off, PWRTE_off, LVP_off, MCLRE_on ALL_DIGITAL TRUE PORTB_PULLUPS = On 'In en uitgangen 'Nixies en neons Symbol klok = PORTA.1 Symbol ZetVast = PORTA.0 Symbol Data_Pin = PORTA.2 'Temperatuursensor en RTC Symbol SDA = PORTB.4 Symbol SLC = PORTB.3 'Knoppen Symbol KnopR = PORTB.7 : TRISB.7 = 1 Symbol KnopM = PORTB.6 : TRISB.6 = 1 Symbol KnopL = PORTB.5 : TRISB.5 = 1 'Variabelen declareren Dim Teller As Byte Dim Temp1 As Byte Dim Temp2 As Byte Dim BCD_Opt As Byte Dim index As Byte Dim Seconden As Byte Dim Minuten As Byte Dim Uren As Byte Dim Datum As Byte Dim Maand As Byte Dim Jaar As Byte Dim Temperatuur As Byte Dim neon As Byte Symbol Reg_Seconden = $00 Symbol Reg_Minuten = $01 Symbol Reg_Uren = $02 Symbol Reg_Dag = $03 Symbol Reg_Datum = $04 Symbol Reg_Maand = $05 Symbol Reg_Jaar = $06 Symbol Lezen = %11010001 Symbol Schrijven = %11010000 Clear While 1 = 1 Tijd: For index = 0 To 50 I2CIN SDA, SLC, Lezen, Reg_Uren, [Uren] I2CIN SDA, SLC, Lezen, Reg_Minuten, [Minuten] I2CIN SDA, SLC, Lezen, Reg_Seconden, [Seconden] neon = %01111001 SHOut Data_Pin, klok, msbfirst, [neon \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Uren \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Minuten \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Seconden \ 8] High ZetVast DelayUS 20 Low ZetVast If KnopR = 0 Or KnopM = 0 Or KnopL = 0 Then GoSub TijdInst EndIf DelayMS 200 Next Date: For index = 0 To 10 I2CIN SDA, SLC, Lezen, Reg_Jaar, [Jaar] I2CIN SDA, SLC, Lezen, Reg_Maand, [Maand] I2CIN SDA, SLC, Lezen, Reg_Datum, [Datum] neon = %01111010 SHOut Data_Pin, klok, msbfirst, [neon \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Datum \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Maand \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Jaar \ 8] High ZetVast DelayUS 20 Low ZetVast If KnopR = 0 Or KnopM = 0 Or KnopL = 0 Then GoSub DatumInst EndIf DelayMS 200 Next Temp: For index = 0 To 10 I2Cin SDA, SLC,$91,[Temperatuur] Temp1 = Temperatuur / 10 Temp2 = (Temperatuur - (Temp1 * 10)) Temperatuur = Temp2 Temperatuur.7 = Temp1.3 Temperatuur.6 = Temp1.2 Temperatuur.5 = Temp1.1 Temperatuur.4 = Temp1.0 neon = %00100100 SHOut Data_Pin, klok, msbfirst, [neon \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [$FF \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Temperatuur \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [$FF \ 8] High ZetVast DelayUS 20 Low ZetVast DelayMS 200 Next Wend TijdInst: I2CIN SDA, SLC, Lezen, Reg_Uren, [Uren] I2CIN SDA, SLC, Lezen, Reg_Minuten, [Minuten] I2CIN SDA, SLC, Lezen, Reg_Seconden, [Seconden] neon = %01111001 While 1 = 1 SHOut Data_Pin, klok, msbfirst, [neon \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Uren \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Minuten \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Seconden \ 8] High ZetVast DelayUS 20 Low ZetVast DelayMS 200 Inc Teller If KnopR = 0 Then BCD_Opt = Seconden GoSub bcd_tellen Seconden = BCD_Opt Teller = 0 EndIf If KnopM = 0 Then BCD_Opt = Minuten GoSub bcd_tellen Minuten = BCD_Opt Teller = 0 EndIf If KnopL = 0 Then BCD_Opt = Uren GoSub bcd_uur Uren = BCD_Opt Teller = 0 EndIf DelayMS 250 If Teller = 12 Then Break Wend 'Wegschrijven I2COUT SDA, SLC, Schrijven ,Reg_Seconden, [Seconden] I2COUT SDA, SLC, Schrijven ,Reg_Minuten, [Minuten] I2COUT SDA, SLC, Schrijven ,Reg_Uren, [Uren] Return bcd_tellen: Temp1 = BCD_Opt & %00001111 'Xor Temp2 = BCD_Opt - Temp1 Temp2 = Temp2 >> 4 Inc Temp1 If Temp1 > 9 Then Temp1 = 0 Inc Temp2 If Temp2 > 5 Then Temp2 = 0 EndIf EndIf Temp2 = Temp2 << 4 BCD_Opt = Temp2 + Temp1 Return bcd_uur: Temp1 = BCD_Opt & %00001111 'Laagste bits doorlaten Temp2 = BCD_Opt - Temp1 Temp2 = Temp2 >> 4 Inc Temp1 If Temp1 > 9 Then Temp1 = 0 Inc Temp2 If Temp2 > 5 Then Temp2 = 0 EndIf EndIf Temp2 = Temp2 << 4 BCD_Opt = Temp2 + Temp1 If BCD_Opt > 23 Then BCD_Opt = 0 EndIf Return DatumInst: I2CIN SDA, SLC, Lezen, Reg_Jaar, [Jaar] I2CIN SDA, SLC, Lezen, Reg_Maand, [Maand] I2CIN SDA, SLC, Lezen, Reg_Datum, [Datum] neon = %01111010 While 1 = 1 SHOut Data_Pin, klok, msbfirst, [neon \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Datum \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Maand \ 8] DelayUS 20 SHOut Data_Pin, klok, msbfirst, [Jaar \ 8] High ZetVast DelayUS 20 Low ZetVast DelayMS 200 Inc Teller If KnopR = 0 Then BCD_Opt = Jaar GoSub bcd_jaar Jaar = BCD_Opt Teller = 0 EndIf If KnopM = 0 Then BCD_Opt = Maand GoSub bcd_Maand Maand = BCD_Opt Teller = 0 EndIf If KnopL = 0 Then BCD_Opt = Datum GoSub bcd_Datum Datum = BCD_Opt Teller = 0 EndIf DelayMS 250 If Teller = 12 Then Break Wend 'Wegschrijven I2COUT SDA, SLC, Schrijven ,Reg_Jaar, [Jaar] I2COUT SDA, SLC, Schrijven ,Reg_Maand, [Maand] I2COUT SDA, SLC, Schrijven ,Reg_Datum, [Datum] Return bcd_jaar: Temp1 = BCD_Opt & %00001111 'Xor Temp2 = BCD_Opt - Temp1 Temp2 = Temp2 >> 4 Inc Temp1 If Temp1 > 9 Then Temp1 = 0 Inc Temp2 If Temp2 > 9 Then Temp2 = 0 EndIf EndIf Temp2 = Temp2 << 4 BCD_Opt = Temp2 + Temp1 Return bcd_Maand: Temp1 = BCD_Opt & %00001111 'Laagste bits doorlaten Temp2 = BCD_Opt - Temp1 Temp2 = Temp2 >> 4 Inc Temp1 If Temp1 > 9 Then Temp1 = 0 Inc Temp2 EndIf Temp2 = Temp2 << 4 BCD_Opt = Temp2 + Temp1 If BCD_Opt = $13 Then BCD_Opt = 1 EndIf If BCD_Opt = 0 Then BCD_Opt = 1 EndIf Return bcd_Datum: Temp1 = BCD_Opt & %00001111 'Laagste bits doorlaten Temp2 = BCD_Opt - Temp1 Temp2 = Temp2 >> 4 Inc Temp1 If Temp1 > 9 Then Temp1 = 0 Inc Temp2 EndIf Temp2 = Temp2 << 4 BCD_Opt = Temp2 + Temp1 If BCD_Opt = $32 Then BCD_Opt = 1 EndIf If BCD_Opt = 0 Then BCD_Opt = 1 EndIf Return EndThe hex file: Link.
The next step is making the case. But this may take a while.
Dutch 