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1  Using Arduino / Displays / Re: Help Needed in lcd JHD 162A interfacing with arduino2560 on: April 18, 2014, 09:08:56 am
Hi Friends.. when i connect my JHD 162A lcd with arduino2560 i just want to test contrast but it not working i connect pot with pin 3 and also use led to cnfirm thats the pot is working. pot work good but contrast not changed  smiley-sad-blue

any suggestion??
My first suggestion would be for you to rewrite your post using coherent sentences.
Explain how you have connected your potentiometer and explain just how you used an LED to confirm that the pot is working.


Don
2  Using Arduino / Displays / Re: LCD Display 16X2 needs the Arduino Board to be reset now and then on: April 18, 2014, 09:04:51 am
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Any help please
It's a little tough to help without seeing the code that is causing the problem.

Don
3  Using Arduino / Displays / Re: ecran B0802A on: April 16, 2014, 11:47:37 am
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Hello
I want to display information on the screen that I just bought but I do not. I searched a lot on the internet but mine is a 8 * 2 character which is not common.

    So I do not really know how to connect. (pin 1 to 14) ...

                                                            thank you

The connections are exactly the same as for the 16x2. 

In the program change   lcd.begin(16, 2);  ==>    lcd.begin(8, 2);


Don
4  Using Arduino / Displays / Re: Help w/ Display (Drivers SPLC780D OR ST7066U) on: April 14, 2014, 10:12:36 pm
You aren't providing much information.  Are you sure that the current drain of the backlight isn't causing your supply voltage to sag?

Don
5  Using Arduino / Displays / Re: Help w/ Display (Drivers SPLC780D OR ST7066U) on: April 14, 2014, 09:20:35 pm
According to the data sheet that you linked to this is a 3.3v device.  Have you taken that into account?

Don
6  Using Arduino / Displays / Re: I2C Display issues, can't get it to work... on: April 14, 2014, 01:09:17 pm
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Hi, I purchased an I2C display from eBay.
You might have better luck if you get a bit more specific.

Have you looked at any of the other forum posts concerning I2C LCD adapters?


Don
7  Using Arduino / Displays / Re: text extraction from arduino uno on: April 14, 2014, 11:49:55 am
Recognizing a voice command to activate an output and translating voice to text are two different capabilities.  Are you sure that whatever voice recognition device you are using has the capability to output text?

Don
8  Using Arduino / Displays / Re: lcd 20x4 problem on: April 11, 2014, 02:46:00 pm
The backlight has nothing to do with the LCD controller and hence the LiquidCrystal library or its associated code are irrelevant. 

Have you connected pins 15 and 16?


Don
9  Using Arduino / Displays / Re: LCD 20x4 to arduino uno on: April 11, 2014, 02:39:03 pm
You have a display that can operate over an extended temperature range.  Typically these devices need a negative voltage between LCD pin 3 and GND unless the ambient temperature is very high.

To check this out you can use a 9V battery.  Disconnect the end of the potentiometer that is currently going to GND and connect it to the negative side of the battery.  Connect the positive side of the battery to GND.  You should now be able to vary the voltage at LCD pin 3 from -9V to +5V.


Don
10  Using Arduino / Displays / Re: Problem with LCD? on: April 08, 2014, 09:56:43 am
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But actually, one will suffice in general as the internal divider chain already totals 11k ...
Where have you been able to find information about the internal workings of the controller?  I have been looking for this.

Don

11  Using Arduino / Displays / Re: Can't get my LCD screen to work. Help? on: April 07, 2014, 09:55:27 pm
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Is that possible? that I need to  connect other pins?
No.  But you do need to connect the required pins correctly.  Since your LCD module has a non-standard pinout you will not be able to just follow the pictures in most tutorials. 

I suggest that you disconnect everything and start over following this generic outline:


(1) If the module has a backlight then get it working properly.  This involves only pins 15 and 16 on most LCD modules.  Make sure to use a current limiting resistor if there is none on the LCD module.

(2) Get the power and contrast working properly.  This involves only pins 1, 2, and 3 on most LCD modules.  You should be able to just barely see blocks on one row of a two row display and on two rows of a four row display. 

NOTE:  The Arduino has not been used yet, except as a possible source for the power needed for the first two steps.  Do not try to go any further until this is working.  If you don't see the blocks then no amount of program code will help.

(3) Connect the LCD R/W pin (pin 5) to GND.

(4) Connect the six control and data wires between your LCD module and your Arduino.

(5) Upload your sketch and it should work.


Troubleshooting:

If you have a 16x1 display and there are blocks only on the left half of the row in step 2 then use lcd.begin(8, 2); in your sketch.

If you still don't get a display then make sure that your wiring matches the numbers in the descriptor (or vice versa).


Code:
//LiquidCrystal lcd(RS, E, D4, D5, D6, D7);
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);      // put your pin numbers here

If you get a display but it is garbled or has some other problems then try again with a 'static' sketch, one that displays a simple message on the top row of the display and then stops.  All of your code should be in setup() and loop() should be empty between the brackets.

Code:
#include <LiquidCrystal.h>

//LiquidCrystal lcd(RS, E, D4, D5, D6, D7);
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);      // put your pin numbers here

void setup()
  {
  lcd.begin(16, 2);                          // put your LCD parameters here
  lcd.print("hello, world!");
  lcd.setCursor(0,1);
  lcd.print("it works!");
  }

void loop()
  {
  }

If you are still having problems then we need to see a photograph of your setup that clearly and unambiguously shows all of the connections between your Arduino and your LCD module.  We also need a copy/paste version of the code that you are actually using, not a link to the code that you think you are using.

Don


12  Using Arduino / Displays / Re: Can't get my LCD screen to work. Help? on: April 07, 2014, 07:54:49 pm
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...  but try connecting the second half of the control pins, like my hitachi has 8 control pins looks like you only have four. in some lcds the other four is the other half of the screen. good luck
If you believe this then I have a bridge you might be interested in purchasing.

Don
13  Using Arduino / Displays / Re: Problem with LCD? on: April 07, 2014, 06:37:16 pm
You might just as well connect LCD pin 3 to GND rather than use a resistor, but to provide the contrast voltage correctly you need a voltage divider, ie two resistors. 

A resistance near 1K ohms between GND and LCD pin 3 and about 10K ohms between +5V and LCD pin 3 will typically be a good starting point.


Don
14  Using Arduino / Displays / Re: [Solved] LCD03 i2c problem (only displays i2cmode@0xc6) on: April 07, 2014, 02:11:24 pm
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Sorry if you feel that this topic is like pulling teeth. If I have misused the “posting instructions”; I’m sorry.
It's not that you misused anything, you just did not post enough information for anyone other than those who are already familiar with 'robot-electronics' part numbers to help you.

Don
15  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 --> http://forum.arduino.cc/index.php?topic=149018.0


Don
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