The 16×2 character LCD module in my LCD Keypad Shield (mine resembles a counterfeit) has one 110Ω (111 SMD) resistor in series with the Anode (A) pin (Pin 15) trace. The value was verified by a ...

Meanwhile, pre-provided shield templates allow your smartphone’s display to emulate a switch, slider, keypad, or LCD display without you actually having to wire anything up.