Master Clock contact duration?


Darren Conway
 

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



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Frank Chadwick
 

Hi Darren,

Have you thought of buffering the synchronome pulse with a monostable circuit? There are two benefits from doing this; you get a repeatable clean pulse as your input and you can set the pulse width to what ever you wish.

Frank C

Sunny Saddleworth UK.


On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


neil
 

Ive done this already Darren, using an Atmega, and a P FET driver. Just make the pulse width a variable in your software. Ill have a lookntokorrow snd see how many ms i ended up with.
Neil.
Nz

On Wed, 17 Mar 2021, 9:36 PM Frank Chadwick via groups.io <fr4nk.chadwick=tiscali.co.uk@groups.io> wrote:
Hi Darren,

Have you thought of buffering the synchronome pulse with a monostable circuit? There are two benefits from doing this; you get a repeatable clean pulse as your input and you can set the pulse width to what ever you wish.

Frank C

Sunny Saddleworth UK.


On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


John Hubert
 

Here are 3 oscilloscope captures - which shows how much the impulse duration can vary.  Trace 1 is an early clock running a largeish system via a distribution board.  Despite the master movement running at a relatively low current (about 300 mA from memory), the clock has a noticeable ’snappy’ action and the impulse is short at 27.6 mS (see cursor measurements box at the top left hand side for Delta T)



Nest trace following in next post.

John

On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


John Hubert
 

Trace 2 is a later clock, running alone and having No 1 (i.e. small) slave movement.  This clock also has a seconds switch, though that is an entirely separate circuit.  The duration is 89 mS (again seen from the cursor measurement for Delta T at the top left)



My apologies for the poor image - the location has poor lighting and the ‘scope had to be balanced on a step ladder to allow the probe to reach!

John

On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


John Hubert
 

The third and final trace is a ’triangle movement’ Synchronome, running alone with a standard slave movement.  The duration here is 35.6 mS



The triangle movement is slightly different to the normal Synchronome movement, but was used with the same slave movements.

John

On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


John Hubert
 

On 17 Mar 2021, at 09:34, John Hubert via groups.io <jfphubert=gmail.com@groups.io> wrote:

<IMG_2523.heic>


Simon Taylor
 

.heic  ?
You a mac or ipad too! YAY!

(opened for me!)


--
Simon GPO Clocks

http://www.lightstraw.uk/gpo/clocksystems/index.html


John Hubert
 

It was taken (the photo) on an iPhone and mailed via a Mac.  For some reason, the first two photos (all 3 were taken today) appear as photos, the third as a .heic file.  The purpose was to illustrate the wide variation in impulse durations.

On 17 Mar 2021, at 09:49, Simon Taylor <smktaylor1@...> wrote:

.heic  ?
You a mac or ipad too! YAY!

(opened for me!)


--
Simon GPO Clocks

http://www.lightstraw.uk/gpo/clocksystems/index.html



Simon Taylor
 

.heic, is a much more compressed format,about half the size of a JPG which still produces full quality images. A bit like jpg was to bmp.

here is a screenshot of heic vs. jpg.

I expect microsoft will catch up in the next update...





--
Simon GPO Clocks

http://www.lightstraw.uk/gpo/clocksystems/index.html


John Hubert
 

I was puzzled about why the first two images posted in jpg and the third in heic.  I posted all by dragging the image from “photos” into the e mail being written.  I think probably the reason may be that I cropped the first two images in “photos” on the Mac, but cropped the third in “photos” on the iPhone.  That is the only thing I can think of that I did differently.  The key message is that the Synchronome system doesn’t have particularly closely controlled impulse duration, which varies considerably from master clock to master clock.  I an not sure if there is a particular reason, but I have noticed that early clocks usually have a more ’snappy’ action.  The pallet shape is slightly different …….

The triangle movement clock has a different pallet altogether.  This is the early clock;

and this (below) is the later clock;


On 17 Mar 2021, at 10:46, Simon Taylor <smktaylor1@...> wrote:

.heic, is a much more compressed format,about half the size of a JPG which still produces full quality images. A bit like jpg was to bmp.

here is a screenshot of heic vs. jpg.

I expect microsoft will catch up in the next update...

<Screenshot 2021-03-17 at 11.43.35am.png>



--
Simon GPO Clocks

http://www.lightstraw.uk/gpo/clocksystems/index.html



Simon Taylor
 

I guess the duration depends on how long the gravity arm takes to reset? I would imagine that different clocks would have small differences, maybe power supplied, type of reset arm, strength of coils, the gap between them and the armature, etc. I don't really know them well, but I can imagine that different individual clocks could have a range of impulse durations between them.

I have the same difference on GPO hipp toggle clocks, but it depends on the decay of the pendulum arc. If the contacts operate just after a hipp driving impulse, then the duration is longer than if the contacts operate just before the toggle operates. Indeed, the specification for a pulse is between 200-500mS .
--
Simon GPO Clocks

http://www.lightstraw.uk/gpo/clocksystems/index.html


Darren Conway
 

Hi

Thanks for all the info.

The problems with the 555 timer option for me are:

  • it would need a custom PCB or a strip board for mounting the components.
  • the Solidine clock requires a bipolar pulse.

So for me, the simplest/cheapest option is to use a Arduio Uno and a 2 channel motor drive shield.  To reduce noise sensitivity and switch bounce, I am using opto-isolators between the Sychronome master and the electronic interface.  This is combined with a couple of cheap switch mode power supplies will provide the system I need to drive both standard slaves and the Solidine.

In addition, I will add a couple of switches that will allow me to advance/retard the clocks either a minute or an hour at a time.

I will print an electronics enclosure on my 3D printer. 


Regards

Darren Conway
New Zealand


On 17.03.21 9:36 pm, Frank Chadwick via groups.io wrote:
Hi Darren,

Have you thought of buffering the synchronome pulse with a monostable circuit? There are two benefits from doing this; you get a repeatable clean pulse as your input and you can set the pulse width to what ever you wish.

Frank C

Sunny Saddleworth UK.


On 17 Mar 2021, at 02:23, Darren Conway <darren.conway@...> wrote:

Hi

I am making an Arduino interface between a Synchronome master clock, slave clocks and a slave Solidine Cifra 12 flip clock that requires a bi-polar 48V pulse.

Does anyone know the typical pulse ON duration of  Synchronome?    That info will be relevant for software programing.


Regards

Darren Conway

New Zealand



Virus-free. www.avast.com


cicastol@...
 

Hi,
here is mine later Nome trace, contact duration last 130mS , running at 300mA .