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frienda-oled-091-i2c-ssd1306

4 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

Frienda 0.91” I2C OLED Display Module

Details

Description

Frienda 5 pieces I2C OLED display module with 0.91 inch screen size and 128x32 pixel resolution. Features SSD1306 driver chip with I2C interface for easy connection to microcontrollers. Self-illuminated OLED technology provides excellent contrast and visibility.

Specifications

  • Display Size: 0.91 inch diagonal
  • Resolution: 128x32 pixels
  • Driver IC: SSD1306
  • Interface: I2C (SDA, SCL)
  • Display Color: Blue
  • Operating Voltage: 3.3V to 5V
  • Current Consumption: ~20mA (typical)
  • Viewing Angle: >160°
  • Operating Temperature: -40°C to +85°C
  • Package: PCB module without pin headers

Image

Frienda 0.91 inch I2C OLED Display Module

Features

  • Self-Illuminated: No backlight required, each pixel emits light
  • High Contrast: Excellent visibility in various lighting conditions
  • Low Power: Efficient OLED technology with low current consumption
  • Wide Voltage Range: Compatible with 3.3V and 5V systems
  • I2C Interface: Simple 2-wire communication (SDA, SCL)
  • Compact Size: Small form factor perfect for portable projects
  • No Pin Headers: Requires soldering of header pins for breadboard use

Pinout

  • VCC: Power supply (3.3V to 5V)
  • GND: Ground
  • SDA: I2C data line
  • SCL: I2C clock line

Wiring Diagrams

Arduino Uno Connection

OLED Display    Arduino Uno
------------    -----------
VCC        →    5V or 3.3V
GND        →    GND
SDA        →    A4 (SDA)
SCL        →    A5 (SCL)

Note: Arduino Uno has built-in I2C pull-up resistors

Raspberry Pi Pico Connection

OLED Display    Pico
------------    ----
VCC        →    3V3
GND        →    GND
SDA        →    GP4 (I2C0 SDA)
SCL        →    GP5 (I2C0 SCL)

Note: Add 4.7kΩ pull-up resistors on SDA and SCL if needed

ESP32 Connection

OLED Display    ESP32
------------    -----
VCC        →    3.3V
GND        →    GND
SDA        →    GPIO21 (SDA)
SCL        →    GPIO22 (SCL)

Note: ESP32 has built-in I2C pull-up resistors

Programming Examples

Arduino Code Example

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
 
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C
 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 
void setup() {
  Serial.begin(9600);
 
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
 
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println(F("Hello, World!"));
  display.display();
}
 
void loop() {
  // Your code here
}

CircuitPython Code Example

import board
import busio
import displayio
import adafruit_displayio_ssd1306
import terminalio
from adafruit_display_text import label
 
# Initialize I2C
i2c = busio.I2C(board.SCL, board.SDA)
 
# Initialize display
display_bus = displayio.I2CDisplay(i2c, device_address=0x3C)
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=128, height=32)
 
# Create text label
text = "Hello World!"
text_area = label.Label(terminalio.FONT, text=text, color=0xFFFFFF, x=28, y=15)
 
# Show on display
splash = displayio.Group()
splash.append(text_area)
display.show(splash)
 
while True:
    pass

Applications

  • Arduino and microcontroller projects
  • Raspberry Pi displays
  • IoT device status displays
  • Portable instruments
  • Data loggers
  • Weather stations
  • Digital clocks
  • Menu systems
  • Status indicators
  • Wearable electronics

Compatibility

  • Arduino: All Arduino boards (Uno, Nano, ESP32, etc.)
  • Raspberry Pi: All models (requires I2C enable)
  • ESP8266/ESP32: Native I2C support
  • STM32: Compatible with HAL I2C libraries
  • Microcontrollers: Any MCU with I2C capability

Libraries & Resources

  • Arduino: Adafruit SSD1306 library
  • CircuitPython: adafruit_ssd1306
  • Raspberry Pi: luma.oled library
  • Documentation: SSD1306 datasheet available online
  • I2C Address: Typically 0x3C or 0x3D

Interface Requirements

  • Power Supply: 3.3V or 5V regulated
  • I2C Pullups: Usually built-in on development boards
  • Pin Headers: Requires soldering for breadboard connections
  • Current: Ensure adequate power supply capacity

Notes

  • No Pin Headers: Displays come without headers, soldering required
  • I2C Address: Check address with I2C scanner if multiple devices
  • Power Consumption: Lower when fewer pixels are lit
  • Lifespan: OLED displays may dim over extended continuous use
  • Fragile: Handle carefully, OLED screens can crack easily
  • Static Sensitive: Use anti-static precautions during handling

Usage Tips

  • Solder 4-pin header for easy breadboard prototyping
  • Use pull-up resistors if not present on your development board
  • Start with lower brightness settings to extend display life
  • Consider sleep modes for battery-powered applications
  • Test I2C address before connecting multiple I2C devices

Programming Examples

  • Display text and graphics
  • Real-time sensor data visualization
  • Menu navigation systems
  • Progress bars and status indicators
  • Simple animations and scrolling text

Tags

oled-display, i2c, ssd1306, blue, 128x32, frienda, arduino, raspberry-pi

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