On Thu, 7 Feb 2013, Brendan Simon (eTRIX) wrote:
On Wednesday 06 Feb 2013, Brendan Simon (eTRIX) wrote:
I'm looking for a very small and very low cost SBC with a USB host port,
serial port (UART or RS485) and Ethernet (10 or 10/100). The purpose is
to bridge between two systems -- one system is a piece of equipment that
only has a USB device port (serial protocol) and the other is a master
controller which can have Ethernet and/or RS485.
I was hoping to also add other services such as :- web browser, FTP
server, etc, which led me towards an openwrt solution as possibility.
The best board I've come up with is a TP-Link TL-WR703N. It is cheap,
has Ethernet (and wifi) and an internal serial, but the internal serial
is just a couple of pads (I'd prefer a proper connector) and I'm not
sure I can modify it for RS485 (e.g. provision for a Tx/Rx enable
signal). Two serial ports and/or two usb ports would be nice but not
necessary.
I was wondering if anyone could suggest other boards/products to look at :)
The obvious one to me (if you hadn't thought of it already) is the raspberry pi.
at $35 (not counting case, SD card, and USB power source) it's a little more
expensive than the TL-WR703N, and it doesn't include built-in wireless, but as a
computer you get a faster processor, a LOT more memory, quite a few I/O pins
(including a serial port, but you need a level converter to talk RS232 voltage
levels)
It may end up being overkill for you for this project.
David Lang
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