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[Reply #15 on:]

this is my change in your code:
- in the main sketch: 2x8character and my i2c

Code:

//LCD_C0220BIZ lcd = LCD_C0220BIZ ( );
ST7036 lcd = ST7036 ( 2, 8, 0x3E );

in the ST7036.cpp i changed the LCD Initialization, copied from the working sketch

Code:

void ST7036::init ()
{
   size_t retVal;
   // Initialise the Wire library.
   Wire.begin();
   
   Wire.beginTransmission ( _i2cAddress );
   Wire.write ( 0x00 );   // Send command to the display
   Wire.write ( FUNC_SET_TBL0 );
   delay (10);
   Wire.write ( FUNC_SET_TBL1 );
   delay (10);
   Wire.write ( 0x14 );  // Set BIAS - 1/5
   Wire.write (0x70 | (contrast & 15));  // Set contrast low byte ex 0x73
   Wire.write (0x5c | (contrast >> 4 & 3));  // ICON disp on, Booster on, Contrast high byte  ex 0x5E
   Wire.write ( 0x6C );  // Follower circuit (internal), amp ratio (6) ex 0x6D
   delay(300); // aggiunto
   Wire.write (0x38); // function set aggiunto
   Wire.write ( 0x0C );  // Display on
   Wire.write ( 0x01 );  // Clear display
 //  Wire.write ( 0x06 );  // Entry mode set - increment
   _status = Wire.endTransmission ();
   
   if ( _status == 0 )
   {
      _initialised = true;
   }
}

But....nothing, do not work
if you want try other i may make a test for you. for now i continue my project on the Japanease code

[Reply #16 on:]

Code:

   Wire.write (0x38); // function set aggiunto
   Wire.write ( 0x0C );  // Display on
   Wire.write ( 0x01 );  // Clear display

If this is supposed to be LCD initialization code you should be aware that its sequence does not follow the recommendations put forth in the data sheet.  It doesn't matter how many libraries do it this way, it is still incorrect.  No matter how many times it 'works', do not be surprised if you come across a situation where it fails.

Don

[Reply #17 on:]

thanks floresta for the answer,

the init process are the entire void that i posted:

Code:

void ST7036::init ()

not only the part that you post.
I add your 3 lines for test, because on the japanease sketch my display work, and the difference from it and the original fm library are this 3 lines.

fm library (not working): https://bitbucket.org/fmalpartida/lcd_c0220biz-display-driver/wiki/Home
japanease sketch (working): http://morimori2008.web.fc2.com/contents/Arduino/i2cLCD_Arduino.html

[Reply #18 on:]

I am trying to Pull the data that is being sent to from a furnace control board to a new haven display via the serial RX pin and get a nice clean output that is sent to a computer via the serial TX on the USB. Does anyone have any suggestions?

[Reply #19 on:]

on your control board is there rx output ?
do you know the protocol ?

on electronic side do you need only a "ttl/usb" adapter

[Reply #20 on:]

After a struggle i have managed to get this library working with a newhaven COG LCD NHD-C0216CiZ-FSW-FBW-3V3

http://www.newhavendisplay.com/specs/NHD-C0216CiZ-FSW-FBW-3V3.pdf
the only part i am now struggling with is the Contrast setting.
The specified command
lcd.setContrast(14);
seems to do nothing. Supposedly it has a range between 0-15 but there is no change.
I do not understand the implementation in the data sheet of the follower circuit as this seems to be tied to the follower settings.
Has anyone got any experience using this library successfully that may have an answer?

Thanks