If you move to using a 4-bit interface (trivial in the code), then it’s 4 more displays – 12 LCDs! However I suspect the rest of the wiring might be somewhat challenging… Wiring is described at the end of the this page. In 8-bit mode, the first display needs 10 GPIO pins and each additional display needs just one more pin, so with a maximum of 17 GPIO pins, that’s 8 displays. It is possible to wire up more than one display. The library is simple to use in your own programs, however wiring the displays up may be challenging, so do take care. The following Fritzing diagrams describe how to connect the displays directly to the on-board GPIO of a Raspberry Pi in both 8 and 4-bit modes: See this page for more details of the Adafruit display setup using wiringPi Top: standard 16×2 LCD display connected directly to a Raspberry Pi and (below) an Adafruit RGB back-lit LCD plate with control buttons. The displays can be connected directly to the Pi’s on-board GPIO or via the many GPIO expander chips supported by wiringPi – e.g. It allows you to connect multiple displays to a single Raspberry Pi. The wiringPi LCD devLib allows you to drive most of the popular 1, 2 and 4-line LCD displays that are based on the Hitachi HD44780U or compatible controllers.
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