Big wall mounted 7-segment LED clock

I am still working on the software for this project, the 3D model is ready.

More information, instructions, fotos and video will be added “soon”.

I have printed most of the parts in PETG with 0.2mm layer size, only the white parts are printed with 0.15mm (my first layer still is 0.2mm though)

ps: this project is reusing (my own) wemos D1 mini holder, see: [https://www.printables.com/model/607124-wemos-d1-mini-holder](https://www.printables.com/model/607124-wemos-d1-mini-holder)

Total size : 18.5cm x 50cm

Bill of Material:

Wemos D1 mini
LEDstrip WS2812B 60leds/m (86 leds needed)
M4 threaded rod (you need +/- 42cm)
M4 nuts (32x)
Power socket
LDR (I used GL5539) + 100k resistor
Wire (I used 22 AWG solid core : red, black, green and some flexible 22 AWG)
3D prints in black, white and gray (I have used PETG)
2 bolts for wall mounting

What to print:

filename	nb	color	layer height	Remarks
bottom_left.stl	1x	black	0.2mm
bottom_mid.stl	2x	black	0.2mm
bottom_right.stl	1x	black	0.2mm	is actually same as bottom_left.stl
top_frame.stl	4x	black	0.2mm
top_leddot_frame.stl	2x	black	0.2mm
top_segment.stl	28x	white	0.15mm	Check there are 2 layers at the bottom after slicing
leddot_top.stl	2x	white	0.15mm
bottom_power_box.stl	1x	gray	0.2mm
bottom_wemos.stl	1x	gray	0.2mm
top_power_box.stl	1x	gray	0.2mm	Updated: top_wemos_v2.stl
top_wemos.stl	1x	gray	0.2mm	Updated: top_power_box_v2.stl
bottom_connection_1.stl	2x	gray	0.2mm
bottom_connection_2.stl	2x	gray	0.2mm
top_connection_block.stl	4x	gray	0.2mm
led_support.stl	2x	gray	0.2mm

Instructions:

1. Cut the ledstrip : 28 pieces with 3 LEDs and 2 pieces with one LED each

2. Add some solder to each connection pad of those pieces

3. Glue the pieces into the bottom_xxx printed parts, check for the correct orientation !

4. Solder and connect as much wires as possible (it is easier when the pieces are not yet connected) For the green (data-line) see picture above. Also connect the power and ground.

5. Cut the threaded rod: 8 pieces of 34mm, 8 pieces of 13mm

6. Check that the wemos D1 mini fits inside “bottom_wemos”

7. used threaded rods to connect the bottom_wemos and bottom_power boxes to digit 2

8. Connect the power and ground of the power connection to the ledstrip.

9. Connect the LDR and resistor and connect wires from the wemos (3.3V and A0)

10. Connect the single LEDs on top of the "led_support" (one for the power box, one for the wemos box). I used flexible wire for these connections

11. Connect the third digit to the power and wemos box (and the wires)

12. Connect the first digit to the second digit, with bottom_connection_1 and bottom_connection_2 in between.

13. Connect digit 4 in the same way to digit3

14. Glue the white top_segments to the top_frame (put the visible side on baking paper)

15. Put the leddot_top inside the top_leddot_frame (I did not had to use glue for this)

Firmware:

A first version of the software can be found at: [https://github.com/gvtienen/7_segment_LED_clock](https://github.com/gvtienen/7_segment_LED_clock)

Descrição

Bill of Material:

What to print:

Instructions:

Firmware: