Connecting 1602 LCD to Arduino 2560

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1

Dear All

Please advice any one should have experience connecting 1602 LCD to arduino 2560 digital pins

Please see the attached picture for more understand

Can we connect LCD like this way?
I decided to supply power through I/O pins

Thanks in advance

IMAG0527.jpg
IMAG0527.jpg3264×1840 1.01 MB

2

You can't connect it that way.

  • Pin 15 is the backlight LED anode and pin 16 is the cathode. The current required by the backlight can be higher than the pin can provide, a transistor should be used to switch the backlight on or off, for "Always On" a direct connection to a 5v line is needed.

  • Pin 3 is the contrast pin, it needs a voltage output of between 0 - 5 volts, the arduino can't output voltage levels. It has PWM support, but that needs an RC circuit to create a stable voltage.