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Inexpensive USB port saver! Simple, tiny USB to UART converter with digital isolator working between 2.5V and 5V up to 3Mboud
Inexpensive USB port saver! Simple, tiny USB to UART converter with digital isolator working between 2.5V and 5V up to 3Mboud
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113 backers pledged €2,387 to help bring this project to life.

About

Isolated USB to UART Converter for Arduino pro mini

€2,387

113

What is a prototype?

A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:

Proof of Concept

Explorations that test ideas and functionality.

Functional Prototype

Demonstrates the functionality of the final product, but looks different.

Appearance Prototype

Looks like the final product, but is not functional.

Design Prototype

Appearance and function match the final product, but is made with different manufacturing methods.

Production Prototype

Appearance, function, and manufacturing methods match the final product.

C8ddbae2d1afb781c1c9703501ad8229 original.jpg?ixlib=rb 1.1

Prototype Gallery

These photos and videos provide a detailed look at this project’s development.

Introduction

There are many types of cheap USB - Serial converters on the market, but sometimes they have some issue with drivers since they use fake chip.
So we had decided to make our version of USB - Serial converter, plus we added a digital isolator. The first project was the Debug Board, and later we made this new variant.

Description

It's a USB to UART converter with a digital isolator at the UART side.
It has a micro USB for connecting to the PC and a 6 pin header with the same pin-out of the Arduino Pro mini board.

The chip FT231XQ is used as interface between the USB and the UART protocol, while the Si8642 is used for isolate the board from the PC.
This converter is very useful if you are working on some projects and worrying about short circuit with the main power supply. Because the isolator isolates the two sides therefore there is no electrically connection.

Advantages

  • You don't burn your PC in case of some accidents between your project and the main power supply. Check our test!
  • The noise from your PC doesn't enter in your project.
  • Your project and the PC have isolated ground.
  • Voltage levels of the UART are the same of the power supply of your project.
  • Your project is not powered from the USB of the PC, so you don't have power issue when you power off your project.

Technical data

  • Original FT231XQ: Compatible with almost all the operating systems and capable of variety baud rates from 300 baud up to 3 Mbaud
  • Original Si8642BB-B-IS1: Low-Power Quad-Channel Digital Isolators with isolation rating up to 2.5kV
  • Size of 40 x 17 mm
  • 4.1 mm isolation between the two sides guarantee an electrical isolation up to 1kV
  • Working between 2.5V to 5V.
  • TX and RX LEDs indicators.
  • Micro USB connector.
  • Standard 2.54mm 6 pins female header.
  • Protected by a transparent heat shrink sleeve.
Board components description
Board components description

 

Clearance between the two sides
Clearance between the two sides

Pinout

Pinout
Pinout

 Project File

Schematic and PCB layout are available on my CircuitMaker account.

Our component suppliers 

Our component suppliers
Our component suppliers

 

Risks and challenges

We already have some experience on selling this type of products on-line, as well as experience on the industrial production.
We have a fully tested working prototype.
The only problem might be few days of delay of shipping in case of more than 500 orders.

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Support

  1. Reward no longer available

    Pledge €10 or more About $11

    Get 1 USB - UART converter

    LIMITED you will receive one USB - UART converter at special price!

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    Reward no longer available 50 backers
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    Pledge €12 or more About $14

    Get 1 USB - UART converter

    You will receive one USB - UART converter with standard shipping

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  3. Select this reward

    Pledge €23 or more About $26

    Get 2 USB - UART converter

    You will receive 2 USB - UART converter with standard shipping

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  4. Select this reward

    Pledge €34 or more About $38

    Get 3 USB - UART converter

    You will receive 3 USB - UART converter with standard shipping

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  5. Select this reward

    Pledge €55 or more About $62

    Get 5 USB - UART converter

    You will receive 5 USB - UART converter with discounted express shipping

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  6. Select this reward

    Pledge €100 or more About $113

    Get 10 USB - UART converter

    You will receive 10 USB - UART converter with discounted express shipping

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Funding period

- (30 days)