LCD1602 and Nano problem - Smells like something burned

Other Hardware Displays
1

Hi,

I've looked through this forum and couldn't find any posts similar to what I'm experiencing.

I've been trying to run the classic "hello world" program, but I have 3 screens and I've tried 2 so far. Each time I try to run the program, the screen flickers a bit, and I can smell something burning. It seems to be coming from the Nano.

Here is the wiring I am using:

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And the standard code:
/*
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.

*/

// 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);
}

Does anyone have an idea what could be causing this?

2

Go and read the instructions, then go back and modify your post to mark up the code as such so we can examine it comfortably and reliably.

Then post a perfectly focused photograph of your set-up with all wires clearly visible as they terminate on the modules and show that as a link in the text, not an attachment.

The best way to do this is to take it outside in full daylight but not direct sun and use a digital camera at least a metre away from directly above (or very slightly offset to ensure all the connections are able to be distinguished) using the (actual) zoom to just include all parts of the assembly.

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3

...but I have 3 screens and I've tried 2 so far.

We have to know exactly which LCD modules you are using, preferably with a link to their datasheet(s). The pin connectgions are not all the same, especially if the pins are below and toward the left of the display.

Here is the wiring I am using:
https://www.arduino.cc/en/uploads/Tutorial/LCD_bb.png

That is a drawing of the wiring that you are attempting to use. We need the photograph mentioned by Paul in order to determine the wiring that you are actually using.

Don