LCD i2c

perrault

The first port of call for all these things is the original vendor you purchased it from.

Anyone that doesn't provide support for hardware is not a good source to buy from.

element14 doesn't sell I2C versions (sadly) but I've always used Terry King at YourDuino

He has all the info you need.

https://arduino-info.wikispaces.com/LCD-Blue-I2C

Mark

the arduino is a genuine one, it works well on other use

the lcd comes from Farnell / element 14 , so i thought this was a not so bad place to ask about it

i try to check your link ... hard to connect

the lcd comes from Farnell / element 14

I haven't seen one offered before on element14 but if it's provided as an i2c then there should be some info.

You need to identify the I2C address of the device in order to talk to it.

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

If you can post a link to the device, then we may be able to identify the address they use.

otherwise this sketch may help.

https://brainy-bits.com/tutorials/connect-a-character-lcd-using-the-i2c-bus/

Mark

Four possible device addresses are listed on page 17 of the datasheet:

http://www.farnell.com/datasheets/2051102.pdf

The default is 0x78. There is even initialization code example on page 19.

yes ... but i didn't change the address and when i do an i2c scanner, the answer is 0x3C (sometimes both 0x3C and 0xBC) (no other device than the lcd)

strange

Don't know where 0xBC comes from, but 0x3C is correct. If you remove least significant bit (R/W bit) from 0x78, you will get 0x3C.

Hi perrault

Can you share the code you are using?

about scanner ? here it is , runs on arduino uno rev3

/*=================================================================

Ce sketch est un scanner I2C: il essaye de communiquer avec toutes

les adresses I2C possibles et affiche celle(s) qui réponde(nt).

                      BRANCHEMENT

* Pin SCD du module à scanner  ----------->  SCD de l’Arduino

* Pin SDA du module à scanner  ----------->  SDA de l’Arduino

================================================================ */

#include <Wire.h>

void setup()

{

  Wire.begin();

  Serial.begin(9600);

  Serial.println("\nI2C Scanner");

}

void loop()

{

  byte error, address;

  int nDevices;

  Serial.println("Recherche en cours...");     //search is runing

  nDevices = 0;

  for(address = 1; address < 255; address++ )    // first 255 was 127 , but pb to detect ultrasonic sensor

  {

    Wire.beginTransmission(address);

    error = Wire.endTransmission();

    if (error == 0)

    {

      Serial.print("Equiment I2C trouve a l'addresse 0x");   // i2c device found at

      if (address<16)

        Serial.print("0");

      Serial.print(address,HEX);

      Serial.println("  !");

      nDevices++;

    }

    else if (error==4)

    {

      Serial.print("Erreur inconnue a l'address 0x");   // unknown error at

      if (address<16)

        Serial.print("0");

      Serial.println(address,HEX);

    } 

  }

  if (nDevices == 0)

    Serial.println("Aucun Equipement I2C trouve\n");   //no device found

  else

    Serial.println("Fini\n");   // end

  delay(5000);        

}

It helps if you look back at the original posting ....duuuh.

Guess this shows the benefit of reading the whole thing ...

Sorry, very handy they are stocked now, as the I2C version is much more useful.

I have some code at home for doing the various lines, along with scrolling parts of the display.

You'll need to give me time to extract it as I'm away for a day.

Mark

Hi,

-The for loop try to do it from 1 to 127 (for(address = 1; address < 128; address++ ) ), 7-bit address.

-kulky64 is right, the default address is 0x3C.

Once you are sure it is working you can start to code the writing of the display.

Check also https://arduino-info.wikispaces.com/LCD-Blue-I2C

Regards

Hi,

-The for loop try to do it from 1 to 127 (for(address = 1; address < 128; address++ ) ), 7-bit address.

-kulky64 is right, the default address is 0x3C.

Once you are sure it is working you can start to code the writing of the display.

Check also https://arduino-info.wikispaces.com/LCD-Blue-I2C

Regards