DIY 3D Printed Single Digit Arduino Clock

One Big digit , fully functional Arduino Nano clock

Step 1: Descriptions

Another of a series of unusual clocks, this time made with the help of a 3D printer.

Step 2: Materials

To build this project we need the following components:

- Arduino Nano microcontroller board

- DS3231 Realtime clock module

- SMD5050 Led strip

- 8x 2N2222 or similar Transistors

- 8x 560 Ohm Resistors

- 2X buttons

- Led diode and 220 Ohm Resistor

Step 3: Building

I got the inspiration for making this clock from:

http://8bitmicro.blogspot.com/2012/02/project-clock-two-single-digit-clock.html, but now with DIY 7 segment display made using a 3D printer and 5050 LED strip. The code is modified for DS3231 realtime clock which is also inexpensive but much more accurate than DS1307. The LED strip can be cut on every third diode in series. In this case we should cut it on every second diode. For this purpose was made a small modification that you can see in the video. Each segment of the strip is driven by a 2N2222 or similar low power transistor.

Step 4: Shematic, Code and 3D Printing Parts

For settings time we use two buttons. They are connected to digital pins eight and nine (with 10k pull-down resistors). The LED display segments a~g are connected to Arduino digital pins 0~6 respectively. The decimal point is connected to the pulse output pin of the DS3231 – which will be set to a 1Hz output to have a nice constant blinking LED to show the clock is alive and well.

Arduino and other electronics are housed in a convenient box with a 7 segment display above. Below is a link where you can download the code and .stl files for 3D Print.

Comments

[k1200s]

I'm almost finishing this project.
Can you please explain better how to remove the 3rd led and the resistor of each section? I mean, how the solder connection is made?
If the 3rd led is removed, the remaining two don't light up.
Thanks!

[mircemk]

As shown in the picture, first the insulation should be removed with a scalpel and then the negative pole is soldered to that line

[AlejandroS101]

Nice and simple. This kind of simplicity that make something to be special.