ESP8266 Community Forum

Posted: **Fri Mar 04, 2016 8:01 am**

Hello everyone.

I'm having toruble connecting my ESP8266 (E12-E) with OLED via I2C using this library: https://github.com/somhi/ESP_SSD1306

This is my display:

To which pins on ESP-12E should I connect SDA and SCL pins from my display?
Also, do I need to connect RST pin? Or just pull it up to VCC with a resistor?

The example from this library contains following code:

Code: Select all

/*
HardWare OLED ESP8266 I2C pins
Pin 17,   GPIO14   SCL
Pin 19,   GPIO15   SDA
*/

// Pin definitions
#define OLED_RESET  16  // Pin 15 -RESET digital signal

How do I understand this?
According to documentation GPIO15 should be always connected to GND..

This is my module:

Posted: **Fri Mar 04, 2016 4:06 pm**

Your didplay is configured for 4-wire spi, not i2c.
Look in the example sketches for the weather display, it uses this oled in spi mode

Posted: **Fri Mar 04, 2016 4:39 pm**

The display is configured as I2C already. Tested with arduino Uno and it worked. The problem is still with ESP-12E

Posted: **Fri Mar 04, 2016 6:45 pm**

with

Code: Select all

  Wire.begin(0, 2);

in setup() you initialize the i2c library and define wich pins to use for sda,scl
the same pins will be used in xxx_SSD1306 library.
RST can be defined in init of xxx_SSD1306 library or handled as usual reset pin: 10nF to gnd and 10k to Vcc to reset at power-on.

p.s.: if allready modified why post misleading picture and not mention mod???

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