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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →The Lazy 7 Mini is an open DIY clock that uses a continuous WS2812B RGB LED strip behind seven-segment-style openings, so builders do not have to solder a separate LED for every segment. Its printed frame guides the strip into position; the trade-off is careful fitting, a narrow choice of strip, and some unused pixels. The creator recommends the build for people comfortable with 3D printing, wiring, and programming—not beginners.
How the Lazy 7 Mini works
Instead of assembling individual LEDs into four digits, the design routes one addressable strip through a 3D-printed frame. Tabs hold the strip in place, and openings direct its light through diffuser pieces. The route starts at the upper-left data-in point and runs to the lower-right. Jeremy Cook’s Hackster project overview describes the frame-and-diffuser arrangement and the strip’s turns between rows.
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“Minimal soldering” does not mean solder-free: the documented build connects the strip’s three conductors at its data-in end to the controller, and connects a USB cable for power. The approach avoids soldering individual LEDs into a digit pattern, but still involves fitting the strip, wiring electronics, printing parts, and loading or adapting the clock sketch.
The Tool Desk
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Parallyze’s Lazy 7 / Mini build guide specifies a WS2812B strip with 30 LEDs per meter. The guide’s route calls for 37 pixels, while the finished clock uses 30: 28 for the four digits and two for the colon. Four pixels are left unused to avoid soldering across rows, and three more near the separator are unused in the documented layout. The guide says a 30-pixel arrangement is possible if the sketch’s arrays are changed.
#1 Best Overall
- 【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.
- Width and profile: Use a regular, uncoated strip about 10 mm wide and roughly 1 mm thick.
- Coating: Waterproofed or coated strips are not expected to fit the frame; thick adhesive-backed strips may also cause fit problems.
- Bends: Avoid tight bends, especially near solder pads, where bending can damage LEDs.
- Routing: Follow the frame’s path from upper-left data-in to lower-right, checking the row transitions as you seat the strip.
Parts, controller options, and printing
Electronics
The guide recommends an Arduino Nano with an ATmega328P and a DS3231 real-time clock module. Hackster’s coverage shows a different example build using an Arduino Pro Mini and DS3231. The sources do not establish that either controller is better: choose a board you can wire and support in the firmware, and check how its size and connections suit your enclosure.
The guide also lists two 6 × 6 mm pushbuttons with 1.5–4 mm shaft length, a USB cable, and a 5 V USB supply. It notes that the enclosure can accommodate different microcontroller and RTC combinations. The pictured controller and RTC are illustrative; use the separate clock-sketch instructions for wiring and feature details.
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.
Printed parts and build volume
The print set includes the outer case, case clips, LED frame, left and right clips, electronics case and lid or cable cover, and diffuser components. The creator used black and natural PLA, recommending clear or natural material for the diffusers. Material use is estimated at about 100 g for black parts and 30–50 g for diffusers, depending on print settings.
The outer case’s largest piece measures 151.8 × 63.5 × 48 mm. Oriented diagonally, the guide gives a required printer build volume of 148.72 × 148.72 × 48 mm; Hackster rounds this to just under 150 × 150 × 50 mm. Confirm the usable build area of your printer and the orientation before starting.
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.
Assembly points that matter
- Print the case, frame, clips, electronics housing, and diffuser parts. Use natural or clear material for the diffuser pieces if following the creator’s material recommendation.
- Lay the specified strip into the frame from the upper-left data-in end. Press it beneath the tabs and follow the route carefully, avoiding sharp bends near pads.
- Fit the side clips and verify that no section of the strip sits higher than the clips; a raised section can interfere with closing or fitting the case.
- Connect the strip’s three conductors at the data-in end to the microcontroller. Connect the USB power cable, then secure the cable in the case before closing the enclosure.
- Use the separate clock-sketch guide for the controller wiring and software configuration; the build guide’s pictured electronics are not a complete wiring specification.
Power and brightness
The creator’s guide estimates 80–180 mA at low brightness, gives the default sketch limit as 500 mA, and calculates a theoretical maximum of about 2.2 A or 11 W for all 37 specified pixels. These are design figures in the guide, not independent measurements, and actual draw depends on brightness, the sketch, and the electronics. The author warns that the theoretical maximum may be too much for the small PLA enclosure, and cautions against running a sketch that addresses all pixels without power limiting. Keep the sketch’s current limit in mind rather than assuming the supply or enclosure is suitable for full-brightness operation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who should build it?
The project is open DIY: it depends on printed parts, strip routing, electronics wiring, and programming rather than a ready-to-use commercial clock. The creator explicitly writes, “I do not recommend this to beginners.” It is a more suitable project for someone who can troubleshoot a microcontroller build and has access to a printer with the required build area. Availability of a complete commercial kit or finished clock is not established by the cited project materials.
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.
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