Mar 192012
 

Some time ago I got myself a display, which I was thinking of hooking up to my Arduino Uno.
After having read some examples and reference stuff on arduino.cc and on ladyada.net about the 16 x 2 displays with the HD44780 chip, I was thinking about getting me one of those.
Unfortunately, what I got hold of was a ATM1602B Display, which also is a 16 x 2, but a completely different pin out.
And this is where the problem with this module is, the pin out. The documentation is everything, but clear.
This is a link to its manual and the datasheet.
As can be seen in the provided documentation, they do not number their pins as it is usually done. Starting from 1 (or zero) in one end and increasing it as you move along. No, that seems too easy, doesn't it.
After some trial and error, and measurements, I can conclude that the physical marking on the board is the correct one. Pin number one, is the third pin from the right when looking at the display from the front! The first two pins are the A (anode) and K (cathode) for the backlight.

This is the pin list I used to get it to work.

Arduino         LCD  Name
2               6    Enable
3               7    Data Bit 0 (DB0)
4               8    (DB1)
5               9    (DB2)
6               10   (DB3)
7               11   (DB4)
8               12   (DB5)
9               13   (DB6)
10              14   (DB7)
11              5    Read/Write (RW)
12              4    Register Select (RS)
pot.-out        3    Vo
+5V             2    VDD
GND             1    VSS

Please note, that the pin #1 is actually the third pin from the right when you are facing the display (as stated above).
Here is a link to a page that really help me on the way, http://www.arduino.cc/en/Tutorial/LCDLibrary.
Here is what my final setup looks like.

The potentiometer is 10kohm, and connected between Vdd and Vss, with its output connected to pin 3 (Vo) on the LCD.

Using the LiquidCrystalDisplay library does work well, and is a real time saver to get started quickly.
And here are some simple code to get something up on the display.

/* LCD fun
   2012-03-19
   Joakim Wesslen
   LCD = ATM1602B
*/
#include <LiquidCrystal.h>
// 4 bit setup
LiquidCrystal lcd = LiquidCrystal(12, 11, 2, 7, 8, 9, 10);
// 8 bit setup
//LiquidCrystal lcd = LiquidCrystal(12, 11, 2, 3 ,4, 5, 6, 7, 8, 9, 10);
void setup(void){
  pinMode(13, OUTPUT);  // dbg
  lcd.begin(16, 2);  // columns, rows
  lcd.clear();
  lcd.print("Eureka");
}

void loop(void){
  digitalWrite(13, HIGH); // dbg
  delay(1000);
  lcd.scrollDisplayRight();
}

Now when I have the basics up and running, it is time to get into the more interesting stuff to utilize the full potential of the display.

Let's see what we learn in the future!

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