make an arduino with MSP430

dear sirs

is possible to make an arduino circuit MSP430 microcontroller supports?

By arduino circuit do you mean a circuit designed for the arduino that you can control with the MSP430?
The MSP430 can control plenty of circuits designed for the arduino, if you know how to port the sketch
to the MSP430

Or are you talking about making an arduino board using the MSP430? If so, the MSP is an arduino-like board, but it uses a different chip and different programming language.

The TI LaunchPad is TI's "answer" to Arduino..... although hardware specs wise it's just not comparable, with the largest supported chip in the value line only having 16KB flash, but TI designed it to take "BoosterPaks" which are supposed to be like shields.

The main saving grace is the LaunchPad can be purchased for only $4.30. On the software development side the IDEs provided are commercial crippleware except the open source "mspgcc" and "mspdebug" toolchain, and someone is working on an mspgcc-based port of the Arduino IDE called Energia.

Check out http://www.43oh.com/ -- it's the main enthusiast site for the line. A small but tight community IMO.

I personally plan to do some projects with it soon as it does have some nice features for power-miser-oriented designs. I think of the MSP430G2xxx "value line" as a 16-bit analogue to the Atmel ATTiny series.