# 1.3-inch OLED display module, SH1106, EC11 rotary encoder, I2C

> Module with 0.96 inch OLED display (SSD1306 driver) and EC11 rotary encoder, using an I2C communication interface. Operating voltage 3.3-5V, dimensions 56 x 97mm. Includes dedicated CONFIRM and RETURN buttons for control and visual feedback. Suitable for HMI interfaces, control panels and DIY projects, compatible with Arduino and similar boards. Reference 88126.

- Page: https://sigmanortec.ro/en/module-with-096-inch-oled-screen-and-ec11-rotary-encoder
- Price: 39.98 RON
- Availability: In stock; 1-2 zile
- Reference: 88126 · EAN: 5947357466026
- Category: Mechatronics and IoT > Sensors and Modules > Display and LCD > OLED Displays
- Package (shipping data): 0.027 kg
- Updated: 2026-10-13
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 05:45 (Europe/Bucharest)

## Description

Compact solution for HMI interfaces and DIY projects, it combines a high-contrast 1.3-inch OLED with an EC11 rotary encoder for precise navigation in menus and adjustments. I2C communication reduces wiring and allows quick integration with Arduino and similar boards. It includes encoder push-button and confirm and back buttons for clear control and immediate visual feedback.
The module combines a 1.3-inch OLED display with an EC11 rotary encoder on a single board, accepting both rotation signals and push-button presses, for quickly building a user interface in electronic projects. It is suitable for control panels, configuration menus, parameter adjustments, and any application where clear navigation and immediate visual feedback are needed.
The display is provided by an OLED screen with an SH1106 driver, with a resolution of 128 x 64 pixels, connected via the I2C interface at the default address 0x3C. The EC11 rotary encoder has a plum blossom-style knob and offers 20 positions (pulses) per full rotation, with an integrated push switch, the rotation signals being available separately on the TRA and TRB pins, and the encoder push on the PSH pin.
Among the main features are the 1.3-inch OLED display with SH1106 driver, the EC11 rotary encoder with built-in button, the two additional tactile buttons CONFIRM and BACK, the pin header for I2C and encoder signals, as well as the mounting holes in the board corner. Power is supplied through the VCC and GND pins, at a voltage of 3.3 - 5 V.
Through the I2C interface and the encoder’s digital signals and buttons, the module is compatible with Arduino, ESP32, STM32, Raspberry Pi, and other development boards that have I2C pins and digital inputs.
Specifications:
Supply voltage: 3.3 - 5 V
Display type: OLED
OLED driver: SH1106
Screen size: 1.3 inch
Screen resolution: 128 x 64 pixels
Control type: EC11 rotary encoder
Encoder resolution: 20 pulses per rotation, with built-in switch
Communication interface: I2C, default address 0x3C
Additional buttons: CONFIRM (CON) and BACK (BAK)
Board dimensions: 56 x 97 mm
Pinout:
Connector
Pin
Function
P1 Header pini
CON
CONFIRM button
P1 Header pini
SDA
I2C data line for OLED
P1 Header pini
SCL
I2C clock line for OLED
P1 Header pini
PSH
EC11 encoder push
P1 Header pini
TRA
EC11 encoder A signal
P1 Header pini
TRB
EC11 encoder B signal
P1 Header pini
BAK
RETURN button
P1 Header pini
GND
Ground
P1 Header pini
VCC
Power supply
Module pin
Arduino UNO
Role
GND
Common ground
VCC
3.3V
Module power supply
SCL
A5
I2C clock
SDA
A4
I2C data
TRA
D2
Encoder channel A, recommended on interrupt pin
TRB
D3
Encoder channel B, recommended on interrupt pin
PSH
D4
Encoder push (select)
CON
D5
Optional CONFIRM button
BAK
D6
Optional RETURN button
Usage:
Connect the module’s VCC and GND pins to the power supply and to the common ground with the control board, respecting the 3.3 - 5 V voltage and correct polarity.
Connect SDA and SCL to the microcontroller’s I2C pins, for example A4 and A5 on Arduino UNO.
Connect TRA and TRB to two digital pins, preferably interrupt-capable, for accurate reading of the direction and rotation steps of the encoder.
Connect PSH to a digital pin with a pull-up resistor to read the encoder press.
Optionally connect CON and BAK to separate digital pins if you want dedicated confirm and back buttons, independent of the encoder press.
Program the OLED display as you would for any other module with an SH1106 driver, using a compatible library such as Adafruit_SH110X.h together with Adafruit_GFX and the default I2C address 0x3C.
Read the TRA and TRB signals through an interrupt routine to determine the rotation direction, and PSH, CON, and BAK as digital inputs with software debounce.
Do not reverse the VCC and GND connections and do not exceed the module’s maximum allowed voltage.
For stable results, use short cables between the module and the control board and keep the pull-up resistors active on the encoder and button digital lines.