A specially designed dot matrix LCD module which is use for displaying letters, numbers and symbols etc.

1602 LCD Expansion Shield Board

• Consists of several 5X7 or 5X11 other dot matrix character bits.The interval exists between each line or each bit to creatE a good character spacing and row spacing effect.
• Based on HD44780 LCD chip and adopts standard 16-pin interface.
• It has a contrast adjustment knob, backlight selection switch, but also with four directional buttons, a selection button And a reset button.
• This 1602 LCD expansion board in the true sense of the circuit will be simplified, directly to the board inserted Arduino Duemilanove controller can be.

1602 LCD Expansion Shield Board

1: clear display, instruction 01H, cursor reset to address 00H position.

2: The cursor is reset and the cursor returns to address 00H.
3: Cursor and display mode setting I /

D: cursor movement direction, high level shift right, low left shift S: whether all the text on the screen left or right. High level is valid, low level is invalid.
Instruction 4: Display switch control

D: control the overall display of the open and close, high level that open display, low level that off display C: control the cursor on and off, high level that has a cursor, low level that no cursor B: control whether the cursor Flashing, high level flashing, low level does not blink.

5: Cursor or display shift S / C: Move the displayed text at high level, move the cursor at low level.

6: Function setting command DL: 4-bit bus at high level, 8-bit bus at low level N: Single-line display at low level, double-line display at high level F: 5×7 dot matrix character when low level is displayed, High-level display of 5×10 dot matrix characters.

7: Character generator RAM address setting.
8: DDRAM address setting.
9: read busy signal and cursor address BF: busy flag, high level that busy, then the module can not connect Receive the command or data, if the low level that is not busy.
10: Write data.
11: Read data.