The PICAXE-28X2 builds on top of the X1, improving on the already impressive specs and adding more features.
The 18F25K22 version of the PICAXE-28X2 is the newest revision of the popular 28 series, this new chip replaces both of the discontinued PIC18F2520 (28X2-5V) and the PIC18F25K20 (28X2-3V). This new revision adds more great specs on top of additional PWM channels, and new support for touch sensors and RFIN & RFOUT commands. Now you're working with a even more powerful micro, and still not having to crack a book on "C" programming!
Almost all existing 28X2-5V and 28X2-3V programs can be used immediately on the new 28X2 chip. The only change that may be required is editing the format of any 'let adcsetup = ' command, as the new part has the more versatile 'individual masking' method instead of the original 'sequential masking' method used on t he 28X2-5V. See the 'adcsetup' command in part 2 of the PICAXE manual for more details.
The 'PICAXE' system is a powerful, low cost microcontroller programming system designed to simplify educational and hobbyist use of microcontrollers. PICAXE chips can be programmed in a graphical flow-chart environment or in easy to understand BASIC.