Sitronix ST7066U Demonstration Code

This is Arduino sample code for any display that uses the Sitronix ST7066U controller. The data sheet for this controller is available here. The code can be used for both 2 and 4 row displays.

These displays are part of the CFAH character family and operate at 5V. Please refer the display datasheet before connection to a power source. Further, a variable resistor connection is required for contrast adjustment and its connection scheme has been outlined in the datasheet of the respective part.

Connection Guide

//---------+-------+--------------+------------------------------------------+
// Arduino | Port  | Display pin* |  Function: 8-bit parallel                |
//---------+-------+--------------+------------------------------------------+
// Power                                                                     |
//---------+-------+--------------+------------------------------------------+
// 5V      |       | 5V           |  POWER 5V                                |
// GND     |       | GND          |  GROUND                                  |
//---------+-------+--------------+------------------------------------------+
// Control Lines                                                             |
//---------+-------+--------------+------------------------------------------+
// D8      | PORTB | RS/DI        |  Register Select                   (RS)  |
// D9      | PORTB | R/W          |  Read/Write                        (RW)  |
// D10     | PORTB | EN           |  Enable                            (EN)  |
// D11     | PORTB | EN2          |  Enable (second half of display)   (EN2) |
//---------+-------+--------------+------------------------------------------+
// Data Lines                                                                |
//---------+-------+--------------+------------------------------------------+
// D0      | PORTD |  DB0         |  DATA BUS LINE                     (DB0) |
// D1      | PORTD |  DB1         |  DATA BUS LINE                     (DB1) |
// D2      | PORTD |  DB2         |  DATA BUS LINE                     (DB2) |
// D3      | PORTD |  DB3         |  DATA BUS LINE                     (DB3) |
// D4      | PORTD |  DB4         |  DATA BUS LINE                     (DB4) |
// D5      | PORTD |  DB5         |  DATA BUS LINE                     (DB5) |
// D6      | PORTD |  DB6         |  DATA BUS LINE                     (DB6) |
// D7      | PORTD |  DB7         |  DATA BUS LINE                     (DB7) |
//---------+-------+--------------+------------------------------------------+

* Actual pinout varies by display, consult the display's datasheet to confirm

Display Information

Here are links to our active displays that use the Sitronix ST7066U controller:

8 characters by 2 rows

12 characters by 2 rows

16 characters by 1 row

16 characters by 2 rows

16 characters by 4 rows

20 characters by 1 row

20 characters by 2 rows

20 characters by 4 rows

24 characters by 2 rows

40 characters by 2 rows

40 characters by 4 rows

More information

For more inforamtion about other character LCD display offerings, please see our full list here.

crystalfontz/ST7066U