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[Arduino] LCD Display HJ1602A

Posted on March 5, 2012

One of the most important things when dealing with micro-controllers is the ability to output

data. With the Arduino, this can be accomplished easily with the Serial class /

console, transferring the data back to the computer through the USB cable. However, what if

you are developing a product that is supposed to be portable? Well, you will need a LCD

Display panel.

Heres how I set mine up:

(Note the right side is to Arduino)

pin 1 [VSS] Ground

pin 2 [VDD] 5V Power Supply

pin 3 [V0 ] Resistor then to Ground (Contrast Control)

pin 4 [RS ] D12

pin 5 [RW ] D11

pin 6 [E ] D10

pin 7 [D0 ] N/A

pin 8 [D1 ] N/A

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pin 9 [D2 ] N/A

pin 10 [D3 ] N/A

pin 11 [D4 ] D5

pin 12 [D5 ] D4

pin 13 [D6 ] D3

pin 14 [D7 ] D2

pin 15 [A ] Resistor then to 5V Power Source (Backlight Source)

pin 16 [K ] Ground

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This entry was posted in Arduino, Engineeringand tagged Arduino, Display, HJ1602A,

LCD, Sourceby Billwaa. Bookmark the permalink

[http://billwaa.wordpress.com/2012/03/05/arduino-lcd-display-hj1602a/] .

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#include //Initialize LCDLiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);voidsetup(){//Set LCD Display Sizelcd.begin(16,2);lcd.clear();}

voidloop(){//Set Cursor and Displaylcd.setCursor(0,0);

lcd.print("Hello World");}

ou ese a s

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3 T HOUGHTS ON [ARDUINO] LCD DISPLAY HJ1602A

Bulat

on March 27, 2012 at 1:50 AMsaid:

Thank you for useful explanation of HJ1602A working! But it is still not clear, which

backlight and contrast resistors must be used in this circuit?

Billwaa

on March 27, 2012 at 9:14 AMsaid:

Hey there. The backlight source (pin 15) is optional, if you input a 5V on that

pin, the backlight LED will be on, or else it will be off. It will still display text

regardless though. It just provide better view-ability with the backlight on. If

could attach that to an Arduino digital pin if you want, so you can directly

control the backlight like how you would with a normal LED. As with normal

LED, you always want to attach a resistor in series in order to limit the current

and have a longer LED service life. For the resistor itself, since I am not an

Electrical Engineering major, I dont really know which value to use. But

anyone that is not too strong should work (aka it still allow the LED to turn

on).

As for the contrast control, similar deal. With different value for the resistor,

the text appear to be either stronger or not as strong. You just have to play

around to see which resistor work best for you. It is sometime different from

board to board. Some people just use a potentiometer, which you can adjust

the resistance. Hope that helps!

Bulat

on March 27, 2012 at 11:07 AMsaid:

Really appreciated with so quick response.

Following your advice, after quick experimentation, I realized 2k

resistors are suitable both for backlight supply and contrast control.

This may be orientation figures. Anyway, as you mentioned, each

display, even with standard controller, needs different resistors. So

experiment is a key for success in this case.

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