The LCD Rucksack Kit provides a simple interface to a standard LCD display. It is based upon an AVR Mega328p controller chip - you can communicate with the LCD Rucksack Kit using USART, I2C or SPI. It is highly versatile adapter that permits the easy addition of a LCD to any project.
It is the flexible way to connect an LCD to a microcontroller with the LCD Rucksack supporting I2C, SPI and Serial communications. You set a few jumpers to choose the communications protocol.
It is a simple kit you can build and then use. Provided with documentation and example code.
Easy. See this video https://youtu.be/RgG92GN0DfY the build should take about 40 minutes.
This user guide explains the LCD Rucksack User Documentation