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The 1st Arduino Playground in Greece - Open Source Hardware

LILYGO® TTGO T-Watch-2020

3/6/2020

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Introdution

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Buy it from Banggood
Last year, Lilygo introduced TTGO T-Watch smartwatch that, due to support for expansion boards, was relatively thick, but at least documentation and Arduino code samples can be found on Github. The company has now launched a slicker version with Lilygo TTGO T-Watch-2000.
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Specifications

  • SoC – Espressif ESP32 dual-core wireless processor with 520KB SRAM
  • System Memory – 8MB PSRAM
  • Storage – 16MB QSPI flash
  • Display – 1.54-inch LCD capacitive touch screen
  • Audio – Class-D amplifier, buzzer
  • Connectivity – 802.11b/g/n WiFi 4 and Bluetooth 5.1 via ESP32
  • Sensors – BMA423 three-axis accelerometer with built-in step counting algorithm, activity recognition / tracking, advanced gesture recognition.
  • Misc – Power button (round),  PCF8563 RTC clock, vibration motor
  • Programming – Via Micro USB port (CP2104 USB to TTL chip)
  • Battery
    • 3.7V Lithium battery
    • Charging – 5V/1A via Micro USB port; AXP202 PMIC
  • Dimensions – TBD
  • Weight – 58.5 grams
  • Temperature Range – -40°C ~ +85°C (TBC…)
More Information
  • Lilygo
  • Github
  • Banggood Store


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Buy it from Banggood
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Easythreed®  Mini 3D Printer - from Banggood

27/5/2020

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Greek Unboxing Video

FLASH SALE -- $144
Description:
Easythreed NANO 3D printer is a consumer-grade 3D printer. It is fully assembled (so no assembly is required). Also, it comes with its slicing software (Easyware) which was specifically madefor this model and has a unique auto slice function based on your time and quality preferences. 

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Features:
  •  Very light, only 1KG net weight. Easy to carry and go.
  • Orange color ABS structure, more shiny colors. If you like more beautiful, you can consider it.
  • Acrylic windows included.It isolates the slight odor of the filament when printed, and is quieter and dust proof.
  • One key printing, press the print button gently after TF card is inserted, NANO prints automatically after warm-up.
  • 90*110*110mm mini printing size. Suit for printing desktop model. This makes the printer more likable.
  • Full assembled machine 3D printer, simple operation and convenient.
  • Suitable for household education use or DIY amateurs, and also suitable for students 10 years and older.
  • For those wanting to use a more advanced software to customize printer behavior and slice models we would recommend Cura.
  • Certificate: CE,FCC,RoHs


FLASH SALE FROM EU WAREHOUSE $144
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Package Included:
  • 1 x Orange NANO 3D Printer
  • 1 x Power Cable
  • 1 x USB Cable
  • 1 x TF Card
  • 1 x Card Reader
  • 1 x User Manual
  • 1 x Scraper
  • 1 x Cross Screwdriver
  • 1 x PLA Filament
  • 1 x Filament Holder Set
Included: Software Accessories
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Printer Specifications can be found in product page at Banggood.com, click here.
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FULCRUM MINIBOT 1.0 Mini Educational 3D Printer - from GEARBEST

27/5/2020

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FLASH SALE - $170
The MiniBot 1.0 Mini, a 3D printer designed for children. The future world belongs to children, how to protect kids’ imagination? MINIBOT 1.0 would be a good choice, the small size does not take up too much space, the printing process has low noise and easy operation. It is very suitable for cultivating children’s three-dimensional cognitive ability, so that they can feel the objective existence of the world, continuously improve their creativity, practical work ability, problem solving ability, etc. It is undoubtedly the market the best mini 3D printer for children and students.
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Description:

Children's Best Enlightenment Education Partner
The future world belongs to children, how to protect kids' imagination? MINIBOT 1.0 would be a good choice, the small size does not take up too much space, the printing process has low noise and easy operation. It is very suitable for cultivating children's three-dimensional cognitive ability, so that they can feel the objective existence of the world, continuously improve their creativity, practical work ability, problem solving ability, etc. It is undoubtedly the market the best mini 3D printer for children and students.

●Small Size
Exquisite appearance design, mini and portable, 210 x 210 x 220 mm, you can carry it or place it anywhere to start creation.

●2.8 inch Color Touchscreen
Humanized 45-degree viewing angle operation, and the interaction is simple and friendly. Touch the screen to experience the interaction from your fingers. 7 language operation interface: Chinese, English, French, German, Japanese, Russian, Spanish.

●Intelligent Education
Allow children to use their fancy idea to make unique toys, thereby stimulating children's imagination and creativity, and enhancing their ability to deal with various problems such as three-dimensional

●Removable Magnetic Platform
Disassemble the magnetic platform to facilitate the pick-and-place model at any time to achieve humanized care.

●Ultra-transparent Window for Secure Printing
The transparent window prevents children from touching the hot nozzle during printing and ensures clear observation. This upgraded security measure make this 3D printer particularly suitable for children.

●Resume Printing Function
MINIBOT 1.0 can resume printing from the last recorded position after suffering unexpected power outages or any other unexpected stoppage.

●Low Noise
Brings you the quiet printing experience, can used in office, residential areas, and other environments requiring quiet standards.

●Simple Operation
No installation required, can be used out of the box to avoid inaccurate assembly during assembly and affect accuracy.

● Support WiFi connect (WiFi module needs to be purchased separately).
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FLASH SALE --- $170 --- GEARBEST

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Printer Specifications can be found in product page at Gearbest.com, click here
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Stariver circuit introduction

13/1/2020

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Originally established in 1998, Stariver Circuit is a leading PCB manufacturing (PCB),PCB assembly (PCBA) and electronics manufacturing (EMS) company based in Shenzhen that has had an amazing development from its roots to its present state today. Stariver primarily began as a trading company with only four people but quickly built up in its development to then build their first plant located in Shenzhen in 2005. Currently, Stariver has multiple branch plants and corporate offices in Fujian, Huangshi, Shanghai, Beijing, and Hong Kong. Furthermore, with over 1200 employees and more than 700 million in sales last year, it continues Stariver's growth towards the future where further cooperation with its customers, partners, and staff will occur more frequently. This will establish a solid path in order to tackle the incoming obstacles along the way.

In terms of Stariver's services, Stariver focuses on professional, high-quality work while serving customers well and this has been done by gaining full compliance and certifications for CE, RoHS, ISO9001, etc. You can have a look at more of their quality certificates and equipment used, by clicking here. They also have full capability to produce 2-12 layers of small to large quantity PCB orders while serving you, as the customer, with the best service possible.
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​​In addition to Stariver's PCB production services, Stariver offers an amazing electronics component sourcing service in order to assemble your PCB according to your personal preference. They have various personnel with decades of experience to source your components and Stariver offers an incredibly wide variety of both active and passive components at your disposal with brands including Samsung, NXP, Microchip, Texas Instruments, etc. All items purchased by Stariver are guaranteed to be originally sourced from licensed distributors, ensuring quality and safety with your product. Whether your PCB requires through-hole or surface mount component assembling, Stariver has 4 SMT lines which can produce 1,090,000 points a day from small to medium batches in a short time only. Additionally, to guarantee the top quality which Stariver brings, their services, process control, and quality control systems are regularly audited and maintained, especially when dealing with its PCBA service.

​​For Stariver's PCB manufacturing service, you can either select the Standard or Advanced package where their capabilities differ from each other slightly but it all depends on your project and capacity which you require to manufacture. These are Stariver's production capabilities with the Standard and Advanced package difference shown:
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If you are interested, you can have a look at Stariver's PCB production process which shows what every PCB undergoes before it is done by clicking on the link here. Their website displays a diagram accompanied by multiple images to individually walk you through each of the20 steps completed from start to finish.

For Stariver's EMS service, there aren’t any package options like with the PCB service,as it purely depends on your PCB order and the quantity, type, and price of its components but here are the process capabilities for the EMS service.
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If you are interested, you can have a quick glimpse at Stariver's EMS process which hows how your components are assembled before it is completely done by clicking on the link here. Their website displays a diagram accompanied by multiple images to individually walk youthrough each of the 17 steps completed from start to finish.

Speaking of their website, Stariver Circuit's intuitive site provides enough information for you to receive a brief overview of every aspect of their company. You can also receive a quoteon your PCB order with their site by uploading a Gerber file, filling in your desired PCB details and giving your contact information by going to this page with the link here. Their website is perfect for finding out more information regarding specific details about all of their services and any particular details which you have questions about. A unique feature of their website is that it has a News pages which is regularly updated by the Stariver staff to fill you in on the latest news regarding their company, PCB design tips, issues which one may face, etc. A business performance map is also exhibited on Stariver's website which displays the international relationships which Stariver has with other nations' markets as they have a certain marketing strategy of not doing business only domestically, but globally. You can see this map by clicking here.

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​Finally, in terms of methods for contacting Stariver for any inquiries or questions which you may have, their support team is extremely friendly and responsive as they are very active on email and their social media platforms (Facebook, Twitter, Instagram etc). For more urgent inquiries or requests, you can call them via their phone numbers as listed on their website.


With all of this said, I do highly recommend Stariver Circuit for your next project when you require PCB manufacturing and assembly as they can provide competitive, affordable prices while ensuring high-quality products customized to your preference. Click here to check out Stariver Circuit's website!
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How To Choose The Right Material For You HDI PCBs

26/11/2019

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​High-Density Interconnect (aka HDI) technology is gaining market approval lately as many electronics designers are trooping to get it. It is of note that HDI sales double that of its conventional lines based on the latest market trends. Ordinarily, any electronics designer must select the correct HDI PCB materials regardless of which application they are building. But with HDI, choosing the right equipment is particularly important because you are working with light, small, and powerful PCBs. The pitch is often below eight mils (equiv. 200um) while its aperture is usually below ten mils (equiv. 250um).

1. What is an HDI Stack-Up ?

This section briefly outlines the definition of HDI stack and its role in determining its performance.
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2. ​The Dielectric Material Properties To Consider Before Choosing

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​This section describes that the best performance of HDI depends on the correct choice of dielectric materials, and is introduced from the following aspects:
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  • 2.1: Decomposition Temperature (Td)
  • 2.2: Glass Transition Temperature (Tg)
  • 2.3: Coefficient of Thermal Expansion (CTE)
  • 2.4: Delamination Time

3. What are the Material Requirements for HDI Flexible PCB ?

This section mainly lists the technical material requirements of HDI flexible PCB from the following subsections:
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  • 3.1: Dimensional Stability of Flexible Materials
  • 3.2 Fluidity Control of Cladding Adhesive
  • 3.3 Low and Thin Profile Copper Foils
  • 3.4 Material ’s Resistance to Electron Migration of Binders
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4. ​Different HDI Materials Can be Used for Different

This section mainly describes PCB materials with low loss factor (Df) or dielectric loss tangent to reduce energy loss at high frequencies. For this reason, at least four types of HDI materials are suitable. Check them in the following sections.

  • 4.1: Moderate speed and loss
These are currently the most popular PCB materials. They belong to the FR-4 family. Their ratio of dielectric constant to frequency response is not flat and therefore suffers from higher dielectric losses. Consequently, it can be found useful only for analog or digital applications that do not require high GHz.

  • 4.2 High speed, low loss
This category of HDI materials has a Dk. to frequency curve flatter. The result is a significant low dielectric loss, which is up to half of what is obtainable with Medium Speed materials. Applications with approximately 0 GHz requirements will find it most useful.

  • 4.3 High speed, low loss, high signal integrity
Dk's curve. The frequency is equally flat, and the dielectric loss is also quite small. Another advantage is that they eliminate unnecessary electrical noise common in other material categories.

  • 4.4 High speed, shallow loss, high signal integrity, RF and microwave
Of all the HDI materials discussed, this type of Dk.to frequency curve is the flattest. Also, they have the lowest dielectric loss. This material category is most suitable for applications with GHz requirements up to 20.
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5.  Functional cost of HDI material

​In principle, materials with lower Dk and Df. Values with excellent SI capabilities are the best choice for excellent HDI performance. Besides, the higher the quality of the required materials, the more money you are prepared to spend. Generally, high speed, a slight loss, high signal integrity, RF, and microwave materials are the most expensive categories.

6. Where can I find materials suitable for HD

You can order directly from Amazon, and it would get to your doorstep.

7. The Future of HDI PCB Based on Recent Market Trend

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​Although HDI can indeed be improved, its advantages and applications are endless. HDI PCBs are now being adopted in almost all sectors, including the military, which has further increased their acceptability.

6. Conclusion

HDI technology is rapidly developing globally, and many applications are running on it. However, choosing the right dielectric material for it can be a daunting task. There are a few factors you need to consider before making your choice, and this is what we are trying to help you in this article. We do hope you find this information useful.

About WellPCB

WellPCB is focusing on PCB Prototype and PCB Assembly Turnkey Services. All PCBs products are compliant to ISO, UL, IPC Standard.

Customwiringloom.com and OurPCB.com and WeLLPCB.com are brother companies.
CloomTech. Ltd has been manufacturing and exporting Custom Cable Assembly and Wire Harness for years with professional teams.

OurPCB Tech Limited was founded in 2005, Focusing on PCB manufacturing and assembly, we provided professional services for more than 2,500 customers around the globe.

Media Contact:
Contact Person:
Hommer Zhao (General Manager)
Email: [email protected]
Tel: +86-31186935221
Website: https://www.wellpcb.com


​Source: WellPCB
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