MINI Back to the Future Clock

I decided to make a mini version, for all those who have 3D printers a bit smaller or want to have a more discreet model.

The dimensions are : 160x55x100 mm (length x width x height)

I tried to make it as simple as possible to make, but you have to know how to solder and send an arduino code.

Follow every step and everything should go well !

What you need is:

1. 9 displays 0.36" (3 Reds, 3 Greens and 3 Yellows)
2. Resistors (about 200 / 400 ohms)
3. 1 ESP32
4. 1 power supply 5V 2A + connector
5. 3 mm led (Red, Green, Yellow)
6. Terminals (wago or other)
7. Wires

Buy the components: https://jeje-linge.fr/en/products/back-to-the-future-mini-clock

You should have these parts:

• 1 top
• 1 middle
• 1 bottom
• 2 sides
• 3 back covers

I use superglue to assemble all the printed parts.

I use metal grey spray paint.

2 or 3 layers are generally enough.

You have to "chained" each display line (red, green and yellow).

You have to prepare 4 leds with resistors and wires.

2 greens, 1 red and 1 yellow.

Be carefull : the leds diameter is 3mm NOT 5mm

Glue the leds into the holes.

To put them in place, you just have to force them a little.

You should hear a little "clip" noise when it's in place.

Solder the red and yellow leds on the displays (5v and GND).

Connect all the 5V and GND together with terminals.

To get some room is you have to cut the ESP32 pins off.

Connect the DIO, CLK and green leds to the ESP32.

You can choose between theses 4 code files : 12h or 24h display, with or without automatic change daylight saving time.

Libraries :

TM1637 by Avishay orpaz

Wifimanager by Tablatronix

Ntpclient By Fabrice Weinberg

ArduinoJson by Benoit Blanchon

The clock will provide an access point named "BTTF_CLOCK". I explain every step in the video above.

I used a self adhesive sheet to stuck the labels.