[Swansea Hackspace] Daily Countdown (but working days not calendar)

[Richard Morgan]

Fantastic Ceri - Lego is about my level of 'maker-fu' skills :-)

Terrific suggestions and advice from all, thanks Justin, Alan, Nathan for
the input and taking the time.

I think I've got a better idea of what I'm after for this project now. Will
go look at components and come back to the list for thoughts before I start
the project.

I love Swansea Hackspace - where else can you get such support, advice,
links, lessons learned and guidance, from specialists and mickey-taking all
within hours of asking!

Cheers all

On 28 January 2016 at 19:15, Richard Morgan <richard.morgan at avocation.co.uk>
wrote:

> Cheers Justin,
> So if I wanted three of these for my 3 digit display:
>
> http://uk.farnell.com/kingbright/sa40-19sekwa/display-4-0-cmn-anode-orange/dp/2080054
>
> Could I still use the LED Display Driver you suggested?
>
> https://www.maximintegrated.com/en/products/power/display-power-control/MAX7219.html
>
>
> You mentioned a 'simple SPI interface' - I don't know what that means and
> didn't want to say on the main list.
>
> In terms of other components - would I just need an Arduino Uno(?) or a
> Raspberry Pi to programme this and run it?
>
> Cheers,
>
> Richard
>
>
>
> On 28 January 2016 at 11:31, Justin Mitchell <
> justin at swansea.hackspace.org.uk> wrote:
>
>> On Thu, 2016-01-28 at 11:08 +0000, Nathan Hackett wrote:
>> > From memory I got about 18 hours from 3 AA batteries, with 3x 2.3inch
>> > high led digits. That was at max brightness though, could get a lot
>> > more running them dimmer. Or pick up some £10 10000mah phone charger
>> > packs, that would help. The other downside of larger displays is they
>> > can have several leds in series per segment, which results in a higher
>> > voltage-drop than the arduino can cope with on its own. Things get
>> > complicated. LCD might indeed be more suitable. :)
>>
>> A chip like the MAX7219 will drive upto 8x 7-segment digits, do alot of
>> the hard work for you, and present a simple SPI interface to the
>> arduino/RPi
>>
>> http://playground.arduino.cc/Main/MAX72XXHardware
>>
>>
>> https://www.maximintegrated.com/en/products/power/display-power-control/MAX7219.html
>>
>> Also, how BIG did you envisage this display being ?
>>
>>
>>
>> _______________________________________________
>> Hackspace mailing list
>> Hackspace at swansea.hackspace.org.uk
>> http://swansea.hackspace.org.uk/mailman/listinfo/hackspace
>>
>
>
>
> --
> Kind regards,
>
> Richard
>



-- 
Kind regards,

Richard
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