Re: Tiny universal clock PCB

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7 years 11 months ago #5498 by mjsangster
I'm 80% complete with the board design:
- size 2.5" x 2" x .25" (inches)
- requires 200 -300 mA at 9 - 15 V, 3 pin Molex connector
- 180V at 10 mA generated on the board
- 3x2 multiplexing (2 on at once)
- supports 2 colon sets

Now I'm wondering what I should have for I/O, possible items:
- 2 time/date/option switch inputs
- alarm enable switch
- GPS input
- alarm output (open collector transistor)
- temperature sensor (could be 9700 sensor, cheap and easy to interface)
- ambient light sensor, either on board or off
- any other items?

What kind of connector? Inline 10 pin .100" connector?

- Michael Sangster
Cold War Creations

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7 years 11 months ago #5499 by Pacman223
I would vote for temperate, light sensor myself.. if possible humidity sensor

If have seen a few nixie thermometers with humidity, and think that sounds very cool for a clock

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7 years 11 months ago #5503 by kay486
Replied by kay486 on topic Re: Tiny universal clock PCB
Dont over do the clock, for something like this (small as possible board) you do not need any fancy features. Like humidity sensor, that just sounds stupid to me. Even the GPS is little bit excessive imo.
One thing im not sure about is the ratio of the board dimensions (1,25:1) its close to sqare, i think it would be much more efficient to have it rather longer and slimer. So it would be only deep as the tube diameter and it could rest just under (or behind) the tubes without the pcb sticking out at all. You could make very nice slim clocks this way.

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7 years 11 months ago #5506 by Pacman223
I think I agree about keeping it small and simple , for interesting clock case ideas.. I

like the idea of humidity, but only if everything can be kept small:) but that's me...

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7 years 11 months ago #5509 by mjsangster
Possible I/O:

* 2 switch inputs for setting time/date/options
* 1 analog for temperature
* 1 analog for light sensor
* 2 (1 input, 1 output) for alarm


Also, possible sizes for the board:

* 2.00" x 2.5"
- or -
* 1.2" x 3.4"

Any thoughts?

- Michael Sangster
Cold War Creations

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7 years 11 months ago #5510 by Nisei
Replied by Nisei on topic Re: Tiny universal clock PCB
Sent you an email :)

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