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16  Using Arduino / Displays / Re: LCD03 i2c problem (only displays i2cmode@0xc6) on: April 07, 2014, 11:11:52 am
This is like pulling teeth....  
Now identify the MD03 (or is it MD3)?

Have you looked at this -->

17  Using Arduino / Displays / Re: LCD03 i2c problem (only displays i2cmode@0xc6) on: April 07, 2014, 08:58:11 am
You might get some responses if you identified what an LCD03 is.

18  Using Arduino / Displays / Re: Can't get my LCD screen to work. Help? on: April 06, 2014, 10:06:59 pm
It's possible that you damaged one or both of the LCD controllers when you had the improper wiring.  Try sending 80 characters to the display and see what happens.

Use this program as a guide:

#include <LiquidCrystal.h>

//LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
  LiquidCrystal lcd(12, 11, 5, 4, 3, 2);       // put your pin numbers here

void setup()
    lcd.begin(20, 4);                          // put your LCD parameters here
    for (char i=47; i<127; i++)                // send 80 consecutive displayable characters to the LCD
        delay(100);                            // this delay allows you to observe the addressing sequence

void loop()

19  Using Arduino / Displays / Re: lcd display on: April 02, 2014, 09:41:53 pm
Buy a replacement and get it working.   Then substitute your questionable one for the working one.

20  Using Arduino / Displays / Re: LCD displays only blocks when I upload the Hello, World Example Code on: March 31, 2014, 10:07:52 pm
Is there another reason for the LCD  to display only blocks?
Basically this display usually results from a problem with the wiring and/or a problem with the program code.  You could, however, have a display that is horribly out of specification and in that case there could be a timing issue.

There is a library that was written to deal with 40x4 displays which have two HD44780 type controllers.  It will also handle normal single controller displays.  During the development of that library the author made an effort to adjust the time delays to accommodate the worst displays he could get his hands on so you might want to try it.

To get a copy start here:--> and follow the Downloads link to get to the latest version.

21  Using Arduino / Displays / Re: LCD displays only blocks when I upload the Hello, World Example Code on: March 31, 2014, 04:21:50 pm
Why should he mess with code that works for everyone else?

Of course the tutorial code would be better for troubleshooting if it displayed static information on both lines in setup() and if loop() had no code.

You have adjusted the potentiometer that controls the contrast?
He wouldn't see the blocks if the contrast wasn't set somewhere near where it should be.

Link to DataSheet: 
Well the first two support answers do not relate to the LCD display and the diagram shows a voltage dropping diode where there should be a current limiting resistor.  Otherwise it is perfect.

Wired Exactly Like the example code says
I've heard that before.  We need to see a photograph of your connections to verify what you are saying.  Are you sure you didn't miss connecting LCD pin 5 to GND?

22  Using Arduino / Displays / Re: LCD problem+video+code on: March 31, 2014, 08:21:47 am
Here the code, just before the function wich leads to the error is called:
Have you considered turning your phone 90 degrees when you take your videos?

You really should show all of the code.

You should also show an in-focus picture of your entire setup.

Right now we have no idea which Arduino pins you are using for your display.  For example if you are using pin 1 then the serial.print() can affect your LCD.

23  Using Arduino / Displays / Re: LCD with Sensor Shield v5.0 on: March 30, 2014, 07:12:54 pm
Your LCD appears to have an I2C adapter.  This means that you cannot use the regular LiquidCrystal library that comes with the Arduino IDE.

Have you considered trying the example code on the Sainsmart web page?

24  Using Arduino / Displays / Re: Menu Example Sketch on: March 30, 2014, 01:54:47 pm
If you could point me in the direction of a good basic example of a menu for an lcd/keypad I'd really appreciate it, or a tutorial on how to write one from scratch would be great too.
The 'Phi-menu' at this site --> is specifically designed for the shield that its author sells.  You may get some ideas by looking at his library or you may just decide to replace your Sainsmart LCD keypad shield with his.

25  Using Arduino / Displays / Re: wiring VFD to Arduino Duemilanove on: March 30, 2014, 01:49:07 pm
Please, can someone help me with wiring this VFD to Arduino Duemilanove ?
Wiring the display to your Arduino is the least of your problems.

You really should be asking if anyone can give you help with locating some software to actually control the display with your Arduino.

26  Using Arduino / Displays / Re: PROBLEM WITH MY LCD on: March 30, 2014, 11:23:34 am
The problem was the pin 3, i didn't connect it to ground. The problem is resolved.
You can probably get a better display by hooking up the recommended potentiometer.

27  Using Arduino / Displays / Re: PROBLEM WITH MY LCD on: March 30, 2014, 08:41:16 am
Hi, i have a problem. I plug my LCD PC1602AR-HWA-A (there is a attached picture and the datasheet) with jumpers to Arduino Mega 2560 but it not works.
The display may not be doing what you expect but you haven't told is what it is doing. 
Do you see anything on the display?
Does the contrast potentiometer have any effect?

By the way you haven't mentioned the contrast pin (LCD pin 3) in your connection list. 
If you leave that pin unconnected then the display will always be blank.
If you haven't got a potentiometer then connect LCD pin 3 to GND and you may get a useable display.

28  Using Arduino / Displays / Re: Base Program Language on: March 29, 2014, 03:56:23 pm
29  Using Arduino / Displays / Re: Strange Character on LCD when using bash to send over serial on: March 28, 2014, 05:36:31 pm
I had the same strange character   and it was the serial monitor
must be set to   "  no line ending  "
His problem was with the LCD display not the serial monitor and the answer in reply #2 is still the correct one.

30  Using Arduino / Displays / Re: Help with Adafruit SPI LCD display code. on: March 28, 2014, 05:33:12 pm
Does anyone have a begginers / idiots guide to getting this thing working
Have you tried the guide in the tutorial tab on the page you linked to?

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