hi, im running out of pins on my 328 id like to add a 4 button keypad to it ive seen somewhere you can add extra switches / pins by using an array of different value resistors not sure how it works maby by different voltages to a pin somehow? can someone point me in the right direction or show me …

im, running out of pins

arduinohabib January 25, 2013, 5:42am 8

You can make two ICs communicate with I2C, or you can use a shift register/driver IC

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