![]() ![]() ![]() This project assumes that you know the basics of Arduino programming, otherwise follow our guide on getting started with Arduino. So, in this guide we’rd going to be looking at a way in which you can connect your entire 4×4 keypad to a single Arduino input and still read each button individually. If you’re using one of the smaller Arduino boards such as the Uno or Nano, you’re not going to be able to connect something like an LCD display, TFT display or Ethernet shield to it as well, making it difficult to display the code which has been input and really limiting the functionality you could bring to your project. This is obviously more efficient than connecting the 16 buttons individually but it’s still using up the majority of your Arduino’s IO. One of the problems with using the keypad however, is that you’re going to be using up 8 of your Arduino inputs just to read all of the buttons. A 4×4 keypad is a really useful Arduino project component, particularly for security access projects or projects requiring code inputs. ![]()
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