#531 ATtiny SSD1306 I²C
Basic demonstration using an ATtiny85 to drive an SSD1306 OLED over I²C
Here’s a quick demo..
Notes
In LEAP#530 SSD1306 OLED Bareback I²C, I drive an I²C OLED display with an Arduino. This is the same idea, but using an ATtiny85.
For this test, I’m using a “1pcs 0.91 inch OLED module 0.91” white OLED 128X32 OLED LCD LED Display Module 0.91” IIC Communicate” (aliexpress seller listing) purchased for US$2.75 (Apr-2017), currently listed for SG$1.79 (Jan-2026).
OLED Module Specs
- OLED display, self-illuminating (no backlight), also lower consumption.
- Driver IC: SSD1306
- Size: 0.91 inch
- OLED Resolution: 128 x 32
- I²C interface
| Pin | Description |
|---|---|
| GND | Power Ground |
| VCC | Power + (DC 3.3~5v) |
| SCL | Clock Line |
| SDA | Data Line |
Example Sketch
BasicDemo.ino demonstrates the basics of bringing up the OLED display and running some graphics and text routines.
Since most OLED drivers require the Arduino Wire library, they can’t be used with the ATtiny.
As a replacement, I’m using the Tiny4kOLED driver, which uses the Adafruit-TinyWireM I²C library for the ATtiny.
The ATtiny85 is programmed using an Arduino Uno as described in LEAP#070 Programming an ATtiny With ArduinoISP.
Construction
Designed with Fritzing: see BasicDemo.fzz.
Credits and References
- ATtiny85 datasheet
- “1pcs 0.91 inch OLED module 0.91” white OLED 128X32 OLED LCD LED Display Module 0.91” IIC Communicate” (aliexpress seller listing)
- Purchased for US$2.75 (Apr-2017)
- Currently listed for SG$1.79 (Jan-2026).
- SSD1306 datasheet
- Tiny4kOLED
- Adafruit-TinyWireM
- LEAP#070 Programming an ATtiny With ArduinoISP