The main reason to limit it to 8 is to keep the controller small, since going beyond 8 would require space to put another IC and additional terminal blocks. The Arduino ShiftOut tutorial has an example (see Example 2). You can cascade a second shift register to expand that to 16 and still using only 3 MCU pins. The controller uses a 74HC595 shift register to allow 8 outputs from only 3 MCU pins. Because it’s open-source, you can feel free to build it, program it, modify it, or hack it! The design, including schematic, PCB, and parts list can be found in the Download section.īill, yes that’s possible. If you are a technical developer, you can easily customize and extend its functionality, both software and hardware. There is a strong educational aspect of it.
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