PCB for Mini LEDBlind

in Electronic Devices held by gabrialw
Contest Ended, Winner(s) have been selected.
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Description:
I'm looking for a CAD design for a concept I've come up with. My design is to create a small PCB with dimensions not exceeding (if possible) 20mm x 30mm x 6 mm. The small LED is powered by battery and is energized when a button is pressed. The LED connects to a DIP switch to show 1-99. A small button is depressed to turn on and display specific LED numbers.
I'm not an engineer, if this design is not feasible let me know. I'm hoping it's straightforward.
Wants:
The following is the components to include in the CAD design:
• PCB Size: ~30 mm x 20 mm (1.2 in x 0.8 in)
• Height/Thickness: ≤6 mm (0.24 in)
• Total Volume: ~30 mm x 20 mm x 6 mm (3.6 cm³), Component Selection for Compact Fit
1. Battery: CR1220 coin cell (12.5 mm diameter, 2 mm thick, 35 mAh, 3V).
o Use an SMD coin cell holder (~10 mm x 2.5 mm footprint, ~2.5 mm height).
2. Microcontroller: ATtiny20 (QFN-20).
o Size: 3 mm x 3 mm x 0.8 mm (vs. ATtiny85 SOIC: 5 mm x 4 mm).
o 12 I/O pins (sufficient for 7-bit DIP + button + LED).
o Low power, programmable via ISP.
3. LED: 0603 SMD LED (1.6 mm x 0.8 mm x 0.6 mm).
o Ultra-compact, available in various colors.
o Current-limiting resistor: 220Ω (0603, 1.6 mm x 0.8 mm).
4. Push Button: SMD tactile switch (3 mm x 3 mm x 1.5 mm).
o Low-profile, momentary switch for LED activation.
o Pull-up resistor: 10kΩ (0603).
5. DIP Switch: 6-bit ultra-miniature SMD DIP switch (e.g., C&K SDA06H0SBR).
o Size: ~8 mm x 3 mm x 1.5 mm.
o 6 bits cover 1–63; for 1–99, use a 7-bit switch (~9 mm x 3 mm x 1.5 mm, e.g., Omron A6S-7102-H).
o Each switch connects to a GPIO with a 10kΩ pull-up (0603).
6. Capacitor: 0.1µF decoupling capacitor (0603, 1.6 mm x 0.8 mm) for MCU stability.
7. PCB: Custom double-sided FR4 PCB, 0.8 mm thick.
o Dimensions: 30 mm x 20 mm x 0.8 mm.
o SMD components on both sides to optimize space.
o Thin PCB reduces total height.

The designer that meets the overall requirements will be the winner.
Don't Wants:
I need the designer to meet my specifications. If it's not possible, please let me know and I may be able to edit the requirements.
Additional Information
Please ensure the LED’s are two (.75 x .5 x .31 inch) side by side 7-segment LED’s. Please position on the upper right of the PCB and include an 8 position DIP switch.

Lastly, I would like to give this design to a manufacturer to produce a sample. So, all of the resistors, capacitors, etc. need to be included in the design. I prefer a single side PCB please.

Entries

= Buyer's Rating
2nd Winner
#4 NanoDots NinetyNine by humayun
#2 PCB 1.2 by ramins2
#5 PCB 1.3 by ramins2
#12 Display LED by rubertg
#14 Display LED 2 by rubertg

Discussion

khriss

Designer

25 Apr, 2025
Thank you for clarifying. 70x35mm is still a pretty difficult constraint due to the shift registers required for the LED displays, and the size of the displays themselves, but I might be able to make it work.

gabrialw

Buyer

25 Apr, 2025
actually, I originally meant 30x20 mm but I can make 35 mm x 70 mm if you can make that work

khriss

Designer

25 Apr, 2025
One final question before I submit my design. Is the 30x20mm dimension for the maximum board size what you intended? Or did you actually mean 3x2 inches?

gabrialw

Buyer

24 Apr, 2025
Petert5 great question. In this cast the thickness of the led is ok. it will actually pop through a plastic cover. Hope that makes sense.
24 Apr, 2025
Should the overall height requirement be made thicker?
Or should the 7-segment LED height be made thinner?
24 Apr, 2025
Your size specification for the 7-segment LED is the following:
0.750" H x 0.500" W x 0.310" D (19.05mm x 12.70mm x 7.87mm)

This doesn&;t fit within the 6mm high requirement for the overall design.
Should the PCB be made thicker, or should the 7-segment LED be made thinner?

gabrialw

Buyer

22 Apr, 2025
Sorry for the confusion. I posted this under additional information: Please ensure the LED’s are two (.75 x .5 x .31 inch) side by side 7-segment LED’s. Please position on the upper right of the PCB and include an 8 position DIP switch.

khriss

Designer

22 Apr, 2025
Any other information about the board would also be appreciated, i.e. LED preferred colour, preferred position for the DIP switches, etc.

khriss

Designer

22 Apr, 2025
Hey, could you clarify what LED(s) you would like in the circuit? At one point you mention a single 0603 LED, but then mention 7-segment LEDs. Two 7-segment displays would have to be controlled a little differently than a single LED, If using 7-segment displays, that would possibly end up using another IC to handle the LEDs, some shift registers perhaps, or something along those lines. Is this acceptable?
Also, what would you like the dimensions of each LED segment to be?
21 Apr, 2025
I have been working in the construction sector for 11 years, developing strong skills in architectural design and construction management. During this time, I have designed and overseen the construction of two two-story villas, three single-story residential homes, and two five-story commercial buildings.
With my foundational design abilities, I can handle all aspects of architectural formation—both external and internal—and produce various design drawings for reinforced concrete, steel, and wooden structures. I am also proficient in structural design, from initial concepts to roof designs, complete with accurate calculations.
I am skilled in using several software programs, including BIM (Building Information Modeling), Revit, Robot, AutoCAD, ETABS, Advanced Steel, and 3Ds Max.
I take pride in my ability to create buildings that harmonize with the characteristics of the local environment, blending classical and modern styles. Additionally, I am passionate about designing green buildings that promote human health and well-being. I am eager to showcase my design skills by delivering your project in a contemporary and outstanding manner. I am confident that we can forge a lasting partnership.
I look forward to collaborating to achieve great goals for ourselves, our future generations, and our families.
Wishing you best!

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