==== Microchip MCP2221 ====
<wrap right>
{{:interfaces:mcp2221.jpg?200}}
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These are USB I2C/UART/GPIO bridges which can achieve 115200 baud.

Since they are available as a dual in-line package they are very
easy to utilise.
=== Schematic ===

The MCP2221 can be used on a breadboard like this.

{{:interfaces:dougal.png?200}}


=== LED demo ===

A simple utility named Dougal has been written to query the MCP2221
and also demonstrate how to bit-bang the GPIOs.

<code>
hg clone http://hg.kewl.org/pub/Dougal
cd Dougal/src
make
sudo ./mcp2221 -b
</code>

=== Resources ===
[[http://ww1.microchip.com/downloads/en/DeviceDoc/20005292B.pdf|Data-sheet]]