This Arduino Uno-powered project is ... need an I2C module to convert your LCD into an I2C device (so it uses fewer pins), a motor driver for your fan, a breadboard to hold the components together ...

The upper range of the LCD’s input voltage is 3.3V, and these added parts make it possible to drive the device using 5V hardware like the Arduino Uno pictured above. While he was adding in parts ...

That is because the Arduino part frees the FleaFPGA Uno from the breadboard: you can easily program, control and interface with the FPGA over a serial line or a wireless link using the Arduino IDE.