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Author Topic: HAND HEILD MACHINE  (Read 1435 times)
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If you didn't need a large keypad like 5*6, I'd recommend my serial LCD with keypad connector. It only has 4*4 keypad capability at the moment (capable of 5*6 with some minimal mod). With these many devices, I would keep printer and SD card access on main arduino and possibly set up a second arduino to handle LCD and keypad. That is the easiest path for separating interface from actual functionality. If you mix the two, with all your hardware factors, you will dig a big hole to sink a lot of your time. With a separate interface, you may use serial monitor to simulate it while making the main functions to work. You can then separately develop or purchase a serial lcd keypad and complete the project.
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