Berlin Clock - Mengenlehreuhr replica V2

This is a miniature replica of the Berlon clock "Mengenlehreuhr" designed by Dieter Binninger.

 

• Working principle :
  • There are 24 light signals arranged on 5 levels.
  • The round box at the top shows the seconds (by flashing once every second).
  • The first led raw contains 4 led and each box represent 5 Hours.
  • The 4 boxes below each represent 1 hour.
  • The third row contains 11 boxes which represent each 5 minutes. (note that the third, sixth and ninth led of this row are red to represent three quarters of an hour more easily).
  • The 4 boxes in the last row each indicate 1 minute.
  • The clock reads top to bottom.

Print Settings

Printer Brand:

Prusa

Printer:

I3 MK3S

Rafts:

Doesn't Matter

Supports:

No

Resolution:

200

Infill:

20
Filament:
[Prusament PLA ](http://www.amazon.com/s?url=search-alias&field-keywords=Prusament+PLA&tag=thingiverse09-20)

How I Designed This

• Second version optimized and with shapes closer to the original clock

• A view of the prototype, at 17:58
• [The backplate has changed]

Global structure

• I used a MAX7219 for the LED control, à DS3231 for the real-time clock and an Arduino board
• The model has been modelized in order that the front face is on the heatbed.

By printing with a Prusa i3 Mk3s+ (or earlier) with a textured PEI Powder-coated Steel Sheet, it is possible to get a "mat" effect.

Category: 3D Printing

Electronic (new)

Here are the different diagrams allowing you to reproduce this miniature :

LED schematic

Arduino, RTC and pins of the MAX7219 schematic

MAX7219 schematic

Last version code :

//Version finale
#include <Wire.h> //Pour la communication I2C
#include <RTClib.h> //librairie DS3231
#include "LedControl.h" //librairie Max7219
RTC_DS3231 RTC; //modèle de la RTC (RTC DS3231)
LedControl lc=LedControl(12,11,10,1); // LedControl(DataIn, CLK, LOAD, Nb_de_Max7219)
int min_1 = 0;
int min_5 = 0;
int heu_1 = 0;
int heu_5 = 0;
void setup () {
    Serial.begin(57600); //nombre de bauds: définir le même nombre sur le moniteur série (Ctrl - Maj - M)
    Wire.begin();
    RTC.begin();
    RTC.adjust(DateTime(DATE, TIME)); //Ajuster l'heure et la date de la clock avec celles de l'ordinateur
lc.shutdown(0,false); // réveiller le MAX7219, endormi par défaut
lc.setIntensity(0,4); // Définir intensité des leds
lc.clearDisplay(0); // éteindre toutes les leds

DateTime now = RTC.now();

}
void loop () {
DateTime now = RTC.now();
min_1 = (now.minute()%5);
min_5 = (now.minute()/5);
heu_1 = (now.hour()%5);
heu_5 = (now.hour()/5);
Serial.print("heu_5 : "); //test de conformité
Serial.println(heu_5);
Serial.print("heu_1 : ");
Serial.println(heu_1);
Serial.print("min_5 : ");
Serial.println(min_5);
Serial.print("min_1 : ");
Serial.println(min_1);
Serial.println();

for (int i=0; i&lt;heu_5; i++)// les cinq heures
{
  lc.setLed(0, 0, i, true);
}


for (int i=4; i&lt;4+heu_1; i++)// les une heures
{
  lc.setLed(0, 0, i, true);
}


if (min_5 &gt; 0) {  // les huit cinq premières minutes
  for (int i=0; i&lt;min_5 ; i++) {lc.setLed(0, 1, i, true);}
} 
else {
  lc.setRow(0,1,B00000000);
}


if (min_5 &gt; 8){   // les trois cinq dernières minutes
  for (int i=0; i&lt;-8+min_5 ; i++) {lc.setLed(0, 2, i, true); }
}
else {
  for (int i=0; i&lt;3 ; i++) {lc.setLed(0, 2, i, false);}
}


if (min_1 &gt; 0) {  //les une minutes
  for (int i=0; i&lt;min_1 ; i++) {lc.setLed(0, 2, 3+i, true);}
} 
else {
  for (int i=0; i&lt;4 ; i++) {lc.setLed(0, 2, 3+i, false);}
}

lc.setLed(0, 2, 7, true);
delay(1000);
lc.setLed(0, 2, 7, false);
delay(1000);

}