Pinouts*

Ya, that was the idea, to use the SPI printouts for a GPS to interface the I2c LCD as well as our other circuitry......ill post my YouTube video of it all later today or tomorrow....

you know it too

look here:

http://www.ebay.com/itm/271019848784?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

Pretty!

I did download a document link just now that includes the "32lcd" library....

I'll see if it has examples in the compiler, but it would be cool to see if anyone has messed with these...

Has anyone attempted to design anything with this LCD? I am watching it on Ebay, but am a little confused on which library I would even start with.....

FM,

Is that you in your picture for your profile? It looks like a girl I went to High school with

I was going to mention...about the sainsmart stuff....forget their 0x27  garbage!  you need to verify the I2C address for the device you're communicating with via this I2C scanner code:

 // i2c_scanner
 //
 // This program (or code that looks like it)
 // can be found in many places.
 // For example on the Arduino.cc forum.
 // The original author is not know.
 //
 // This sketch tests the standard 7-bit addresses
 // from 0 to 127. Devices with higher bit address
 // might not be seen properly.
 //
 // Adapted to be as simple as possible by Arduino.cc user Krodal
 //
 // June 2012
 // Using Arduino 1.0.1
 //
 
#include <Wire.h>
 

void setup()
 {
   Wire.begin();
 
  Serial.begin(9600);
   Serial.println("\nI2C Scanner");
 }
 

void loop()
 {
   byte error, address;
   int nDevices;
 
  Serial.println("Scanning...");
 
  nDevices = 0;
   for(address = 0; address <= 127; address++ )
  {
     // The i2c_scanner uses the return value of
     // the Write.endTransmisstion to see if
     // a device did acknowledge to the address.
     Wire.beginTransmission(address);
     error = Wire.endTransmission();
 
    if (error == 0)
     {
       Serial.print("I2C device found at address 0x");
       if (address<16)
        Serial.print("0");
       Serial.print(address,HEX);
       Serial.println(" !");
 
      nDevices++;
     }
     else if (error==4)
    {
       Serial.print("Unknow error at address 0x");
       if (address<16)
        Serial.print("0");
       Serial.println(address,HEX);
     }   
   }
   if (nDevices == 0)
     Serial.println("No I2C devices found\n");
   else
     Serial.println("done\n");
 
  delay(8000);           // wait 8 seconds for next scan
 }








Then open the serial monitor after uploading and check the address.....mine was 0x3F

FM,

Yes...your Library you were trying to Direct me to was the same Andrew was......and the one sainsmart has you download is the same as well.

Here is what i was doign wrong all along!   So In the beginning I had my I2C scanner running so I knew it was address 0x3F i was communicating with right?

Well when I had first downloaded that new LiquidCrystal Library...I discarded the other liquidCrystal library that is in 1.0.1 but what I was doing wrong:  I didn't discard the LiquidCrystal_I2C library I had downloaded before...it kept wanting to use that one......because the LiquidCrystal_i2c.h  and LCD.h  is already in the new LiquidCrystal library.....Now I just have to tinker with the code to make it say what I want in the loop etc...

But you guys have been so great and patient...I REALLY APPRECIATE it.....

Thanks to FM and Andrew......

Andrew!!!!!!  You are the Man!   I just hooked it up , downloaded library and uploaded and it worked like a champ!   Thank you so much bro!

For arjscott.....in your comments you say don't forget to use the new liquidcrystal library...you're referring to the one sainsmart provides compatible with arduino right?

I appreciate the help guys.....I found a similar thread on a different library a guy used so I'm going to check into that....everything here is close but no cigar......its definitely 0x3F as well....no matter their website......labor day amend.....gonna break for now

Nah its definitely 0x3F...

Here is taken from my serial monitor just now:

I2C Scanner
Scanning...
I2C device found at address 0x3F !
done

Scanning...
I2C device found at address 0x3F !
done



I switched code around a bit:



#include <Wire.h>
#include <LiquidCrystal_I2C.h>




LiquidCrystal_I2C lcd(0x3F, 20, 4);


void setup()
{
 
  lcd.init();                      // initialize the lcd
  lcd.backlight();
 
}

void loop()
{

 
  Wire.begin();
  lcd.setCursor(0,0);
  lcd.print("Hello"); 
  lcd.setCursor (0, 1);       
  lcd.print (" World!");

 
     
}


my backlight will stay on now.....the pixels are fluxuating...adjusted the contrast still no characters....

I am so close I feel it...I just need some new tips....

here is my code:


#include <Wire.h>
#include <LiquidCrystal_I2C.h>




LiquidCrystal_I2C lcd(0x3F, 20, 4);


void setup()
{
 
  lcd.init();
  Wire.begin(0x3F);
  lcd.print("Hello"); 
  lcd.setCursor ( 0, 1 );       
  lcd.print (" World!"); 
  Wire.endTransmission(); 
}

void loop()
{

}



pins 4 and 5 from arduino Uno plugged into I2C board on 20 x 4 LCD...along with ground and power.....just white pixels on LCD still and the LED backlight flashes from time to time.....