NOW you're looking at the almighty kahuna of the PICAXE lineup. With themost pins,most memory, and all the features of the X1 series, you'll be hard-pressed to find a project that this chip can't handle.
The PICAXE-40X1 offers:
1000 lines memory
Hardware I2C support for easy peripheral connecting
Increased variables and separate memory scratchpad
Enhanced mathematical functions
3-7 8/10-bit Analog-to-Digital converters (ADC)
20MHz maximum operation speed (4MHz normally)
12-Bit Digital temperature sensors
Plays user-defined musical tones
PWM Motor control
Input Pulse counting
Serial output & debugging via programming cable
Higher baud rate for serial work
Based on the PIC 16F887 IC
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.