LCD doesn't work

Other Hardware Displays
1

Hi, I bought an arduino nano and a lcd that model (PC1602F datasheet(1/1 Pages) POWERTIP | OUTLINE DIMENSION & BLOCK DIAGRAM)

http://img9.imageshack.us/img9/3628/9zg6.jpg

I conected everything on it's right place and then loaded the program to arduino. Nothing worked. Then I noticed that a black dot on the rar of the LCD turns very hot when conected to power. Is that normal? could the lcd be damaged? if not what could be wrong?

http://imageshack.us/a/img856/551/yznz.jpg

2

Seems like there is still something wrong with the connection/wiring - can you show us the code you used and maybe post a higher resolution photo of the wiring done?

3

Thanks for the reply, here is the code, tomorrow I will try to upload High resolution photos.

/*
  LiquidCrystal Library - Hello World
 
 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.
 
 This sketch prints "Hello World!" to the LCD
 and shows the time.
 
  The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)
 
 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe
 
 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}
4

Sounds like messed up the connections to the LCD. Make sure you have these two correct:
Pin1 = GND
Pin2 = VCC
Did you connect these wires correctly? Try connecting:
Pin1 --> GND
Pin2 --> VCC
Pin3 --> GND
Leave all other LCD pins disconnected. You should see the top line with black blocks. And the 'blob', which is the LCD controller should not get hot.

5

Your LCD module has a non-standard pinout. Make sure that you are not blindly following the pictures of the wiring for a device with a standard pinout.

Most devices have pin 1 near the edge of the board, yours has pin 14 at that location.

Standard: 1, 2, 3 ...  13, 14, 15 ,16
Yours:    14, 13, 12 ...  2, 1, 16, 15

Don

6

Thanks a lot!!! now it's working!!! The problem as you said, was that my LCD has a diferent pinout :sweat_smile:

7

Now that you have the right pinout for that board, please share it with all of us. Next guy using that board will surly appreciate it.
Thanks, Jack

8

Now that you have the right pinout for that board, please share it with all of us. Next guy using that board will surly appreciate it.
Thanks, Jack

The pinout information is right there in reply #4. If you are using a tutorial or a diagram based on a more standard display you just have to follow the pin numbers or the pin names rather than following a picture of the pins. The pins all have the same functions, they are just in a different physical location.

Don

9

Thanks Don.