Building a USB UART Serial Adapter

RE: Building a USB UART Serial Adapter

dougw — Sun, 19 Mar 2017 22:10:27 GMT

I like the use of stripboard, that stuff is a truly great invention.

RE: Building a USB UART Serial Adapter

keaaw — Sun, 19 Mar 2017 12:17:15 GMT

I'd really like to try making this! I get pretty much most of the schematic except for the RC circuit connecting to the shield at the lower left -- what this for, eliminating noise from the USB cable?

RE: Building a USB UART Serial Adapter

DAB — Mon, 16 Nov 2015 19:58:18 GMT

Great post.

One caveat though, be careful using this interface with older serial devices.

Some of the serial UART chips pushed a lot of current down the lines, which could overwhelm your newer devices.

DAB

RE: Building a USB UART Serial Adapter

michaelkellett — Mon, 16 Nov 2015 15:15:41 GMT

Thanks for the heads-up re. the MCP2221 - this looks like a really handy low cost part. I'm just re-reading Axelson's HID to VB notes and think I might put one in a board I'm about to start.

RE: Building a USB UART Serial Adapter

balearicdynamics — Mon, 16 Nov 2015 12:10:28 GMT

Your project is very interesting because it is adaptable to a lot of different microcontrollers. When integrated to custom microcontroller designs (like the last I wrote programmable with Arduino), can make the differente. I plan to include this piece of hardware in the board design for a new enhanced version. Not so important for the programming options but with a serial USB availability on the board it is possible a more complete feedback with the controlled circuit, especially when it is a server. This means that the bare power-off button can launch a server command for regular shutdown and use the server the same to make the normal activity logs to the administrators on the network.

Enrico

RE: Building a USB UART Serial Adapter

CrazyFace — Mon, 16 Nov 2015 11:10:01 GMT

Nice project, Reminds me of the pic programmer I made following a tutorial a few years back, you may want to edit your first diagram, because I'm sure on the raspberry pi you have the 0v ground connected to a 5v pin, nothing major but just thought I should mention it.

RE: Building a USB UART Serial Adapter

Problemchild — Mon, 16 Nov 2015 09:51:25 GMT

With so many adaptors around for a quid or so it's hardly worth doing for the basic cases. However I'd see it as a good way of getting a custom design going especially if you needed level shifting or direct connect to an I2C device with out an intervening MCU. The through hole parts make it easy to rough out a prototype Thingy-ma-jig (tm) using a bit of pad board.

The MCP devices seem to be quite well thought out both in functionality and price!

RE: Building a USB UART Serial Adapter

mcb1 — Mon, 16 Nov 2015 06:55:26 GMT

Nice project [mention:b0bc65b9ecdc4307bd967592f00e340a:e9ed411860ed4f2ba0265705b8793d05]

I presume the PID and VID are the generic ones from Microchip and can be used by anyone.

If you were to make more than one of these, you can set the serial number the same so that window doesn't load a new driver and new port number for every device.

If you want to use these on Picaxe, you'll need to be able to invert the Tx/Rx output, which I'm not sure I saw on the setup page.

Mark

RE: Building a USB UART Serial Adapter

balearicdynamics — Sun, 15 Nov 2015 21:01:44 GMT

Great project Shabaz!

I was not aware of the existence of this IC DIL, one of the problems that making USB to serial was almost impossible with my available "technology" [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-c6220dce-9d2c-44fa-93cf-d068d95627d4/contentimage_5F00_2516.png:16:16]

Thank you for sharing

Enrico