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The Lazy 7 Mini is a DIY RGB clock that uses a continuous WS2812B LED strip routed through a 3D-printed frame to form four seven-segment digits and a colon. The frame positions LEDs behind diffuser pieces, so the build avoids soldering separate LEDs into each segment. It still requires 3D printing, wiring, programming, and careful strip placement; its creator says it is not recommended for beginners.
How the Lazy 7 Mini makes seven-segment digits
Instead of assembling individual LEDs into each digit, the design bends one addressable strip through a printed frame. Tabs hold the strip in place, and openings in the frame let selected pixels shine through diffuser pieces. The route begins at the upper-left data-in point and ends at the lower-right. The result is less LED soldering, not a solder-free project: wiring the strip to the controller and power remains part of the build. Hackster’s project overview describes the frame-and-tab arrangement.
The documented layout specifies a WS2812B strip with 30 LEDs per meter and calls for 37 pixels along the route. In the completed clock, 30 pixels are used: 28 for the four digits and two for the colon dots. The guide leaves four pixels unused to avoid soldering across rows and notes that three more pixels beside the separator are unused in its layout. A 30-pixel arrangement is also possible if the sketch arrays are changed. These counts describe the guide’s routing, not a general requirement for every possible modification.
Parts and materials to prepare
- LED strip: A thin, regular, uncoated WS2812B strip, 30 LEDs per meter, about 10 mm wide and roughly 1 mm thick. Waterproofed or coated strips, and thicker adhesive-backed versions, may not fit the frame.
- Controller and clock: The guide recommends an Arduino Nano with an ATmega328P and a DS3231 real-time clock module. Hackster’s pictured example uses an Arduino Pro Mini with a DS3231 instead. The sources do not establish one board as universally better; choose a combination you can wire and support in the sketch.
- Controls and power: Two 6 × 6 mm pushbuttons with 1.5–4 mm shaft length, a USB cable, and a 5 V USB power supply.
- Printed components: The case, case clips, LED frame, left and right clips, electronics case and lid/cable cover, and diffuser components. The creator used black PLA for the case parts and natural PLA for diffusers.
The guide estimates about 100 g of black filament and 30–50 g for diffusers, depending on print settings. Those are the creator’s material estimates, not independently measured consumption.
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- 【3-COLOR VARIETY PACK】Includes 1 Red, 1 Green, and 1 Blue 32x8 dot matrix LED display module (256 LEDs each, single fixed color per module — not full-color RGB). Mix modules for animations, status indicators, scrolling messages, retro game displays, or layered pixel art.
- 【3D-PRINTED ENCLOSURES INCLUDED】Three color-matched custom-fit 3D-printed PLA cases (Red, Green, Blue) protect each module from dust and scratches with a finished look. Suitable for desktop, wall-mount, or embedded installations.
- 【CASCADABLE DAISY-CHAIN DESIGN】Standard MAX7219 chaining via DOUT to DIN ports lets you build wider displays (64x8, 96x8, or larger). Suitable for scrolling text banners, music visualizers, large pixel animations, or game graphics.
- 【MAX7219 DRIVER + SPI CONTROL】Onboard MAX7219 IC with 16-level software-adjustable brightness, constant-current LED drive, and low-power shutdown. Simple 5-pin SPI control (VCC 5V, GND, DIN, CS, CLK). Works with ESP32, ESP32-S3, ESP8266, Raspberry Pi Pico, STM32, Micro:bit, C++, MicroPython, and CircuitPython.
- 【COMPLETE DIY KIT】Includes 3 × 32x8 MAX7219 modules (Red/Green/Blue), 3 × 3D-printed enclosures, plus pin headers (1 long male strip + 3 female sockets) for soldering, breadboard, or wired use. Build clocks, scrolling tickers, scoreboards, audio visualizers, or educational demos. Sample code on Lonely Binary GitHub.
Check the printer and strip fit before assembly
The largest case piece is 151.8 × 63.5 × 48 mm. The guide gives a required print volume of 148.72 × 148.72 × 48 mm when that piece is rotated 45 degrees; Hackster rounds this to just under 150 × 150 × 50 mm. Confirm the usable build area of your printer and slicer orientation before starting.
Fit is also sensitive to the LED strip. The frame is designed for a thin, regular 10 mm strip and the guide says waterproofed or coated strips will not fit. Avoid tight bends, especially close to solder pads, where bending can damage LEDs. Test the strip against the frame route before committing to assembly.
Rank #2
- [Colorful Digital Clock Kit] The finished soldering kit is a colorful RGB clock with a cool look. It is a perfect gift for beginners and DIY enthusiasts. When you finish it. It will be a cool ornament in your bedroom/living room/office.
- [Multi-function Alarm Clock] 4-digit digital clock displays time/date/temperature. In addition, it has light control, memory, alarm function and four alarm music selections. Color RGB display can be set for random color display or specified color display. Temperature calibration is required for first time use.
- [Simple Soldering] The principle of this DIY soldering kit is simple, we've already done the ones that need to be patched. You just need to solder the remaining components. We will provide detailed instructions in English, so that you can successfully solder the finished product. But you still need to have some soldering experience. (We don't have button cell batteries included. You need to buy CR1220 coin cell battery separately.)
- [DIY Hobbyist's Gift] This electronic digital clock kit can be used to learn soldering skills, electronic principles, experiments, also suitable for soldering DIY enthusiasts and people who want to learn soldering. The finished alarm clock is a very meaningful gift for your family and friends.
- [Service] We pay more attention to your experience and the quality of our products. We also pay close attention to the fun of the kit, the ease of assembly, as well as the appearance of the finished product and the quality of the components. Any questions. Please contact us.
Assemble and wire the clock
- Print and identify the pieces. Print the listed case, frame, clips, electronics enclosure, lid/cable cover, and diffuser parts. Use clear or natural material for the diffusers as the creator recommends.
- Route the strip. Starting at the upper-left data-in end, seat the strip under the frame tabs and follow the route toward the lower-right. Bend carefully at row transitions and near solder pads.
- Install the clips and inspect the fit. Add the left and right clips. Check that no part of the strip rises above them before closing the case.
- Connect the electronics. Connect the three conductors at the strip’s data-in end to the microcontroller, and connect the USB cable for power. Use the separate clock sketch guide for wiring details and features; the illustrated controller and RTC in the build guide are examples, not a complete universal wiring diagram.
- Secure the cable before closing. Place the cable in the case’s intended position and secure it before fitting the lid or cable cover.
Choose between the documented controller options
| Configuration | Where it appears | What to consider |
|---|---|---|
| Arduino Nano (ATmega328P) + DS3231 | Recommended by the Lazy 7 Mini guide | Use it if this matches the board and firmware setup you are comfortable wiring. The sources do not provide a performance comparison. |
| Arduino Pro Mini + DS3231 | Shown in Hackster’s featured example | This is a documented alternative. Check the wiring and sketch requirements for your specific board and setup. |
The guide says the enclosure can accommodate different microcontroller and RTC combinations. That flexibility does not guarantee every board will work with the same wiring or firmware unchanged.
Keep brightness and power in bounds
The guide estimates 80–180 mA at low brightness, gives the sketch a default 500 mA limit, and estimates a theoretical maximum of about 2.2 A or 11 W for all 37 pixels. These are the author’s design figures, not independent measurements. The guide warns that running a sketch that addresses all pixels without power limiting could draw too much for a small PLA enclosure. Keep the sketch’s power limit in place unless you have verified that your supply, wiring, and enclosure can safely handle the load.
Rank #3
- Digital tube led color:green. clock function:Voice timekeeping function, hourly timekeeping function, temperature display (correction), alarm clock, night light, automatic brightness adjustment, date/week display, power-off memory.
- Single chip microcomputer:STC15W408AS DIP-28,Clock IC:DS1302 DIP-8.32867hz crystal oscillator,CR1220 button battery with power off memory function,USB turn 5V power input.
- Tutorial: The product contains a paper manual. Scan the QR code on the manual to enter the web manual, including detailed welding step diagrams and welding step videos, and instructions for setting the clock
- Light sensor function: when the light is low at night, the digital tube becomes dark automatically; when the light is strong, the digital tube becomes bright. If the photoresistor is short-circuited, the digital tube can be lit all the time.
- widely used in schools to help students learn basic mechanical and electronic skills.Through the analysis of the circuit, understand the working principle of the circuit, learn to train electronic skills, welding training.
Is this build suitable for you?
The Lazy 7 Mini reduces the most repetitive part of a seven-segment LED clock—soldering individual LEDs into the digits—but it remains an electronics and fabrication project. You need a suitable 3D printer, a strip that fits the frame, basic wiring and programming ability, and patience to route the strip without damaging it. Its creator explicitly says, “I do not recommend this to beginners.”
The underlying project is documented as an open DIY build with printable parts, wiring, and programming instructions. The sources cited here do not establish current availability of a complete commercial kit or finished clock.
Quick Recap
Best Value
- 【2 Pack DIY Kits】: The package includes 2 sets diy kit, and has more affordable price. Build your own electronic clock by yourself, a cool project and challenging enough to be fun and entertaining. Not only to improve your soldering skills, you will also will be more familiar with electronic components and learn more interesting electronics things.
- 【Colorful Digital Clock Functions】: The diy electronic clock can display Time, Date (year, month, day, week), Temperature. The brightness can be set to automatically adjust, or you can manually adjust the brightness. 12H/24H, ℃/℉ can be switched at will, with a 1.36-inch digital tube, the screen display clear. Colorful RGB LED, 3 sets of alarm Settings, support to ring every day/Monday to Friday/Monday to Saturday. 2 adjustment buttons for addition and subtraction greatly increase convenience.
- 【Light-controlled Temperature Clock Functions】: The diy electronic clock can display Time, Date (year, month, day, week), Temperature. The brightness can be set to automatically adjust, or you can manually adjust the brightness. With power-off memory and alarm clock function, the alarm clock can be turned on or off by yourself and contains 4 music adjustable. The 4-digit digital electronic clock can also accurately measure temperature.
- 【Easy Soldering】: In addition to teaching basic mechanical and electronic principles, the diy kit is easy to build and the principle is simple. The connection that was clearly mapped and labeled on the board. The diy soldering project is often used to teach basic soldering skills. A great diy electronics kit for any STEM student. The soldering practice kits are also suitable for DIY electronics enthusiasts and can be used as school education practice kits.
- 【English User Manual】: The package comes with a paper instruction manual. You can scan the QR code on the instruction manual and download the PDF document before installation. Or you can download the User Manual before installing (We have uploaded the user manual on the Amazon page at Product guides and documents).
Rank #4
- Please refer to the Product guides and documents below for product installation documentation
- This product is a 24-hour digital circuit clock, using CD4518, CD4511, CD4081, CD4013, CD4060 and other chips, the circuit does not contain a microcontroller, so there is no program, hours, minutes and seconds can be calibrated, without alarm function.
- This kit mainly consists of a second signal generator, counter, decoding display and time calibration circuit. The second pulse is a 1HZ square wave signal obtained by precise frequency division of a high frequency signal generator, which is more accurate in timekeeping.
- Can be used for teaching practical training welding, very suitable for DIY enthusiasts
- Stable product performance, long service life
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
