Berlin Uhr Nano

with a new enhancement for the design of the "Berlin Uhr" or "Mengenlehre Uhr"

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Berlin 1975 - the first digital clock in public made by Dieter Binnninger - no one knew how to read it.

I made here a miniature and a wristwatch version of it.

The color pattern rotates every hour once.

Dimensions : 37 x 45 x 14 mm
Battery : 1s, 500 mAh

 "The time is displayed in a base 5 place value system. ... The first two rows use red lights to indicate the hour, with the top stripe having a glowing segment for five hours and the bottom one for one hour. The current hour results from the addition of the values. Accordingly, the minutes are displayed in yellow segments in increments of five and one in the two lower lines. The lights for 15, 30 and 45 minutes are red for better readability. There is a round flashing light above the lines, which is switched on or off every second." -translated Wiki

I wanted to make a (my first in private) PCB with the ws2812 2020 . I have chosen to redo one of my older projects: "Berlin-Uhr remastered". Back then i used a RTC and it drifted quite a bit after 6 Months. 
The time provides a time-Server via NTP (Network Time Protocol). For that a WiFi & PW has to be set. Also i added 2 rows of indicators to show the exact second. 
At the moment i hard-code it, but i am looking for a way including automatically started AP's, to login a new SSID & PW.


The soldering:


.GBR files for the LED carrier PCB

RAR Archive - 36.75 kB - 07/10/2022 at 12:26




plain - 29.92 kB - 07/10/2022 at 12:03


  • Fit-test

    j08/01/2022 at 11:44 0 comments

  • New Wristband

    j08/01/2022 at 11:34 0 comments

    Added a new wristband and switch:

    The switch is just soldered to a rod and i think i have to desolder it again, when i want to recharge it.

    -we'll see about that if this Lipo is empty.

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hubidrei wrote 07/07/2022 at 14:51 point

In the 1990s i built one, self designed, with lots of TTL chips (mainly counters) no microcontroller, no clock chip on "Europakarte".

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j wrote 07/07/2022 at 14:56 point

Did it have micro-controller or did it run only on TTLs and how did it acquire the time ? RTC or did you have to set it and it synced with the netfrequency (50Hz) ?

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davedarko wrote 07/04/2022 at 11:39 point

nice, will ping @Alex  who also made a Berlin Uhr once :)

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j wrote 07/04/2022 at 11:50 point

I know (; 
Back then i also made a bigger desktop version with a drifting RTC. I could use my old a bad code again here and i remember i wanted to see his code, but i never asked. I am not sure, if he published it.

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