Designed specifically as a platform for teaching/learning about the 8051 microcontroller, the NX-51 V2 is based on an in-system programmable NXP P89C51RD2 microcontroller and features LEDs, 7-segment displays, LCD display, pushbutton switches, matrix keypad, piezo sounder, relay and stepper motor driver, RS-232 interface, DS1820 temperature sensor, DS1307 real-time clock, PCF8574A I/O expander, 24C16 serial EEPROM and I2C-based A/D and D/A.