Bodet Flip Clock Rebuild

Description

I bought a flip clock on auction the other day. It uses an old system where it need a master clock to provide an alternating square wave of 1 Hz to drive a motor that in turn drives the whole clockwork.

The motor diver was implemented with an arduino and a H-bridge with 12V supply for the motor. There is also a function for date and month. This mechanism is clever enough for skipping days when a month has less than 31 days. There is a large slip wheel that knows which month is shown and if we take February for example it will fast forward at 00:00 when the date turns to 29 and skip 29, 30 and 31. It even takes care for a leap year every fourth year. In the video you can se this mechanism play out. It is not driven by the same motor as the rest of the clock but instead there is a place for two 1.5V batteries driving a small DC motor. I connected a voltage regulator to my 12V supply instead in order to not have to care for batteries.

Details

The whole mechanism:

This is what the date skipping looks like:

Add on Real Time Clock

After running the clock for about a week it was several minutes off. Apparently the code I've written based on millis() in Arduino is not accurate enough. instead added a RTC and wrote a code that flips the output every time a the minute is increased. Even if there is some time lag in the code this will not accumulate and the error is reset every new minute.

Schematic

The LM317 is used just because I did not have any fixed regulators in my workshop. A standard 3.3V regulator would have been fine. Everything is run of a 12V AC/DC converter.

Files

_2021-01-04_BodetClock_RTC.ino

x-arduino - 3.44 kB - 01/04/2021 at 14:48

Download

BODET-BT6.30-BT6.37 Operating Instructions.pdf

Adobe Portable Document Format - 1.81 MB - 12/21/2020 at 21:58

Preview

Discussions

philyne wrote 01/04/2024 at 07:21

Hello, I use your sketch to make my clock work, it's fine ! Thank you !

I'd like to introduce a high speed in the code to adjust time easily. But I not a pragrammer....

does somme one can write it ? Whith a switch ?

thank you

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luvnotvor wrote 12/13/2022 at 18:19

Did you by any change measure the coil on the motor? I have a Boselli flip clock that is missing the coil (and the iron core that goes with it) from its Lavet-type motor. I suppose that with some specs (coil resistance and wire gauge) from a similar clock I could fashion a replacement part.

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bustarox wrote 01/05/2021 at 20:22

Thank You very Much for your answer and your scheme. I use this old technology on my work with chronotop bodet or Gorgy timing (but here it's for personal uses ) but in memory you must limit the current to 100mA to avoid spoil the clock and put a resistor in parallel to the coil (the value must be 2/3 of the R of the clock -> you must measure it with multimeter). I will search this information and post it. have a good day.

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bustarox wrote 01/03/2021 at 08:10

Hello,

Very interesting project. I Had the same Bodet Clock.
Is it possible to have your electronic scheme and the program?

Have a good day.
Thank you.
Busta

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iSax wrote 01/04/2021 at 15:01

Thanks!

I've added the code to 'Files' and you can find a schematic in the description now! I've added a RTC since the video to make it more accurate. It's also in the schematic.

Good luck with yours!

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bustarox wrote 01/11/2021 at 14:13

Dear,

I try to upload your sketch but when I saw the serial Monitor the chip reboot every 9 seconds and it's writing that.

15:10:40.543 -> ets Jan 8 2013,rst cause:4, boot mode:(3,6) 15:10:40.543 ->
15:10:40.543 -> wdt reset 15:10:40.543 -> load 0x4010f000, len 3584, room 16
15:10:40.576 -> tail 0 15:10:40.576 -> chksum 0xb0 15:10:40.576 -> csum 0xb0 15:10:40.576 -> v2843a5ac 15:10:40.576 -> ~ld

I Use an ESP866 and i try to use another program to display the date in the serial monitor in arduino ide and it's Ok.

Is the date is display on you serial monitor in arduio?

thank you in advance.

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Ken Yap wrote 12/21/2020 at 22:14

Cute cat. Very important equipment for detecting sudden noises. 👍😄

The leap year mechanism is impressive. But how come you didn't use the Feb-Mar transition to demonstrate it? What you have in the video seems to be skip 31 for Apr-May.

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iSax wrote 12/21/2020 at 23:05

Yes a cat is a very important instrument indeed, a must in any lab!

I was lazy because it takes a long time to manually flip through the days in a whole year and I messed up the video I recorded just before this one with the Feb-Mar skipping... When the build is done I'll make a walkthrough of the clock and make sure to do it for February. 😄

Are you sure? yes | no

Bodet Flip Clock Rebuild

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Description

Details

Files

_2021-01-04_BodetClock_RTC.ino

BODET-BT6.30-BT6.37 Operating Instructions.pdf

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