[neonixie-l] Re: Digit Fading / transition effects using HV566 Blanking

[Richard Scales]

Just refining my query:

Having thought about this a little more and only assuming that my pseudo 
code example is anywhere near correct, would anyone be able to suggest what 
the relative timings might be for the period that the static digits are 
displayed and the range of periods for the fading in and fading out digits?

Further more, might it be OK to display things in this order:

Static Digits
Fading In Digits
Fading Out Digits

or perhaps in this order:

Static Digits
Fading In DIgits
Static Digits
Fading Out digits

or am I barking up the completely wrong tree!

Richard



On Friday, 1 May 2020 04:56:06 UTC+1, Richard Scales wrote:
>
> Hello everyone,
>
> I am contemplating having a go at implementing some form of digit cross 
> fade effect of which I have zero experience, knowledge or understanding and 
> I am hoping that someone could point me in the right direction.
>
> I can see that there are established designs using HV5622 drivers which 
> are capable of cross fading digits that change and I'd like to implement 
> this myself.
>
> I already use the blanking signal via a PWM signal to perform overall 
> fading of the display (all tubes) though the trick must be maintaining full 
> brightness for the digits that stay static whilst varying the brightness of 
> the incoming and outgoing changing digits.
>
> If this assumption is correct then I'm also going to assume that, even for 
> the digits that remain static - they cannot be on all the time and there 
> must be some 'off' time during which the changing digits can be faded. 
>
> This all makes use of the persistence of vision thing that makes us think 
> that the display is static.
>
> If I'm still on the right track then I am guessing that there will be a 
> sufficient 'off' time for the static digits to allow the fading digits 
> (incoming and outgoing) to be presented at varying degrees of 'brightness'.
>
> In a very rough pseudo code kind of thing:
>
>
> :start of transition
> Set shift register for static digits, turn all digits on, wait long enough 
> for the 'full display' effect', turn all digits off
> Set Shift register for outgoing digits only, turn on, wait long enough 
> though reduce this period during the course of the transition, turn all 
> digits off.
> Set Shift register for the incoming digits only, turn on, wait long enough 
> for the digits to start appearing and increase this period during the 
> course of the transition, turn all digits off
> Loop back to start until transition is complete
>
> Am I anywhere near close with this?
>
> Is there any published method?
>
> I have yet to point my scope at a working clock to investigate this 
> further - I currently have an inherent reluctance to do this following a 
> recent episode of clumsy probing resulting in the premature expiration of 
> the device that I was investigating :-(
>
> It's really just the concept that I would like to fully grasp, I find that 
> I can stare at sample code segments all day long and not make any 
> meaningful progress, though code segments are most welcome.
>
> All pointers gleefully received.
>
> Richard
>
>

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[neonixie-l] Re: Digit Fading / transition effects using HV566 Blanking

[gregebert]

I have an 8-tube clock with b7971's and whenever I find the time... I will 
add a software routine that calculates which segments will change, and 
instead of changing them all at-once, they will be split into a few groups 
that change every 50-100msec. I think it would be too distractive for every 
second, but definitely ok every 10 seconds.

Technically its not really fading; more like morphing.

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Re: [neonixie-l] 1961 Heathkit Catalog

[Nicholas Stock]

You know they relaunched recently? Limited offerings so far though...

https://shop.heathkit.com/shop

Sent from my iPhone

> On Apr 30, 2020, at 21:06, Michail Wilson  wrote:
> 
> 
> Count me in.
>  
> I’d like to group buy for a price break.
>  
> I’m thinking the garage door opener on page 23.
> Sorry, no need for the extra remote for $25.  No one is rich enough to have a 
> second car, but a nice option for those super rich.
>  
> Ok,,…ok… On a serious note.
> I’ll take the scope on page 94.  I hear in about 40 years, you can convert to 
> a clock.
>  
> Michail Wilson
> 206-920-6312
>  
> From: neonixie-l@googlegroups.com  On Behalf Of 
> martin martin
> Sent: Thursday, April 30, 2020 8:42 PM
> To: neonixie-l 
> Subject: [neonixie-l] 1961 Heathkit Catalog
>  
> Since we all seem to have time on our hands... 
> Let's order some Heathkits!
>  
> Time to go on the "Way Back Machine" and make your orders!
>  
> https://www.americanradiohistory.com/Archive-Catalogs/Allied-Catalogs/Heathkit_1961_Fall_Winter.pdf
>  
>  
> -- 
> You received this message because you are subscribed to the Google Groups 
> "neonixie-l" group.
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> To view this discussion on the web, visit 
> https://groups.google.com/d/msgid/neonixie-l/4300122e-515c-418a-9cb4-7d17102fe9c7%40googlegroups.com.
> -- 
> You received this message because you are subscribed to the Google Groups 
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> https://groups.google.com/d/msgid/neonixie-l/MW2PR0102MB343545CF70DA59FCA018039F82AB0%40MW2PR0102MB3435.prod.exchangelabs.com.

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RE: [neonixie-l] 1961 Heathkit Catalog

[Michail Wilson]

Count me in.

I’d like to group buy for a price break.

I’m thinking the garage door opener on page 23.
Sorry, no need for the extra remote for $25.  No one is rich enough to have a 
second car, but a nice option for those super rich.

Ok,,…ok… On a serious note.
I’ll take the scope on page 94.  I hear in about 40 years, you can convert to a 
clock.

Michail Wilson
206-920-6312

From: neonixie-l@googlegroups.com  On Behalf Of 
martin martin
Sent: Thursday, April 30, 2020 8:42 PM
To: neonixie-l 
Subject: [neonixie-l] 1961 Heathkit Catalog

Since we all seem to have time on our hands...
Let's order some Heathkits!

Time to go on the "Way Back Machine" and make your orders!

https://www.americanradiohistory.com/Archive-Catalogs/Allied-Catalogs/Heathkit_1961_Fall_Winter.pdf


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[neonixie-l] Digit Fading / transition effects using HV566 Blanking

[Richard Scales]

Hello everyone,

I am contemplating having a go at implementing some form of digit cross 
fade effect of which I have zero experience, knowledge or understanding and 
I am hoping that someone could point me in the right direction.

I can see that there are established designs using HV5622 drivers which are 
capable of cross fading digits that change and I'd like to implement this 
myself.

I already use the blanking signal via a PWM signal to perform overall 
fading of the display (all tubes) though the trick must be maintaining full 
brightness for the digits that stay static whilst varying the brightness of 
the incoming and outgoing changing digits.

If this assumption is correct then I'm also going to assume that, even for 
the digits that remain static - they cannot be on all the time and there 
must be some 'off' time during which the changing digits can be faded. 

This all makes use of the persistence of vision thing that makes us think 
that the display is static.

If I'm still on the right track then I am guessing that there will be a 
sufficient 'off' time for the static digits to allow the fading digits 
(incoming and outgoing) to be presented at varying degrees of 'brightness'.

In a very rough pseudo code kind of thing:


:start of transition
Set shift register for static digits, turn all digits on, wait long enough 
for the 'full display' effect', turn all digits off
Set Shift register for outgoing digits only, turn on, wait long enough 
though reduce this period during the course of the transition, turn all 
digits off.
Set Shift register for the incoming digits only, turn on, wait long enough 
for the digits to start appearing and increase this period during the 
course of the transition, turn all digits off
Loop back to start until transition is complete

Am I anywhere near close with this?

Is there any published method?

I have yet to point my scope at a working clock to investigate this further 
- I currently have an inherent reluctance to do this following a recent 
episode of clumsy probing resulting in the premature expiration of the 
device that I was investigating :-(

It's really just the concept that I would like to fully grasp, I find that 
I can stare at sample code segments all day long and not make any 
meaningful progress, though code segments are most welcome.

All pointers gleefully received.

Richard

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[neonixie-l] 1961 Heathkit Catalog

[martin martin]

Since we all seem to have time on our hands... 
Let's order some Heathkits!

Time to go on the "Way Back Machine" and make your orders!

https://www.americanradiohistory.com/Archive-Catalogs/Allied-Catalogs/Heathkit_1961_Fall_Winter.pdf


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