The US2066 driver is used in some EastRising displays like the ER-OLEDM1602 - 4

This is my atempt at writing a library for the US2066 based on the 1602-OLED-Arduino-Library (for the Wide.HK OLED 1602 display)

1. Make sure the hardware hardware switches are 0 1 0 (BS2=0, BS1=1, BS0=0) to make the display talk via I2C.
   The ER-OLEDM1602 came with 8080 parallel as default (1 1 0) which needs to be changed by changing the position of the resistor BS2.

2. Ground pins D7-D3, RD, RW, DC and CS and pull the reset pin HIGH(or connect it to the arduino if you want the arduino to reset it at any time). This is essential for the stability of the display. Setting the DC pin HIGH instead of LOW will change the I2C address from 0x3C to 0x3D.

3. Connect GND (VSS) to Ground.
   VDD to +5v or +3.3v. Connect both D2 and D1 to SDA ( A4 on the arduino uno ). Connect D0 to SCL ( A5 on the uno ). You also should pull both SCL and SDA high (individually!) using two 4.7k resistors.

4. Write the code by beginning to create the US2066 object and calling init(); By running init, the OLED will be initialized with the CGROM A which is required for the bar function to work. (Note: init does not turn off the internal regulator which i don't think is necessary but i could be wrong. If you want to uncomment the code at the beginning of init)

5. print!

#include"US2066.h"
US2066 OLED();
void setup()  
{  
  OLED.init();  
  OLED.print("Hello world!");  
}  
...

US2066();

US2066(uint8_t addr);

~US2066();

void init();

void print(char c);

void print(const char *String);

col - Starting column
row - Starting row

void print(uint8_t row, uint8_t col, const char *String);

col - column in which the bar starts
row - row in which the bar starts
size - size of the bar when full (in number of on screen characters)
value - status of the bar in percentage (0 - 100)
This only works if the CGROM A is selected
(which is selected, by default, by the init function)

void bar(uint8_t row, uint8_t col, int size, int value);  

void clear();

void home();

true - on
false - off

void blinkingCursor(uint8_t state);

void cursor(uint8_t row, uint8_t col);

by pedro11x on Github