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Completed the Nixie Clock

13/5/2012

3 Comments

 
It’s been a busy couple of days playing with the Nixie Clock but it’s been well worth it.

The firmware for the PIC is completed and running and the main logic board that contains the PIC, RS232 interface, Audio Amplifier, HT and +5v PSU is complete and working.

I had to make a few “modifications” to the wooden case as the display board PCB was slightly too wide and the 7-way Molex connector was catching on the side, preventing the board from sliding into place. Thank heavens for electric files !!

The chap who will be receiving this is a bit of a change freak and loves things that are configurable, so every parameter can be configured by hooking the clock to a dumb RS232 terminal.

There is provision for two temperature sensors to be connected, and you can set alarms if minimum or maximum temperatures on either channel are exceeded. Alarms are either flashing coloured LED’s and/or an audio alert (frequency configurable of course).

There is provision for the CPU to power down the Nixie tubes during a specified time window. This could be useful during the day when the owner will be at work and should help extend the life of the tubes.

The on board RTC (DS1802) can have its date / time  set via a simple command over the serial port, and is also responsible for trickle-charging the on-board NiMH back up battery.

All that’s left to do is fit everything into the case and possibly make a few alterations to the firmware. I’m using just under 25% of the available program space, so theres lots of room available for additional features. I’ve also added an 8-way Molex connector to the top of the PCB that brings out +5v, 0v and the remaining unused I/O pins from the PIC; this will make hardware expansion simpler when it’s required; and it will be required at some point.
I've marked all the connectors so that when enquiring hands take the darn thing apart, it can be put back to gether... that's going to happen at some point as well I suspect.
Picture
Picture showing back wooden panel with interface connector, logic and driver board.
3 Comments
Dan Ambroise
26/7/2012 02:56:54 pm

so you don't provide any documentation for hobbyists to DIY ??

Reply
Admin
23/9/2012 11:54:50 pm

I do provide documentation if people ask for it and you will see on my website I've documented several projects when people have asked me too. I'd never get anything done if I documented everything.

Reply
Naveed Anjum
3/6/2015 12:23:32 am

kindly send me the pdf and pcb lay out of this project.

Thank you.

Reply

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    A software and hardware engineer who loves retro computers.

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