Wiznet makers

Environment Used

• Hardware: Used with an embedded device like Raspberry Pi.
• Display: SSD1306 OLED display module (I2C interface).
• Processor: ARM-based microcontroller.
• Programming Language: MicroPython.
• Other Components: GPIO pins supporting I2C communication (SCL = Pin 9, SDA = Pin 8).

Technologies Used

1. MicroPython and Machine Module: This library allows direct communication with hardware, setting up GPIO pins, and managing I2C communication.
2. SSD1306 Library: Used to communicate with the SSD1306 display over I2C, displaying text and drawing various shapes.
3. OOP Approach: Managed the OLED display in an object-oriented manner by creating an instance of the OLED_Display class.
4. Performance Optimization: Optimized performance using pixel_threshold and show_delay to control the frequency of screen updates.

How to Use

Initialization:

• Initialize the display module using the OLED_Display() class.
• Set up the connection with the SSD1306 display using I2C.

Display Text:

• Call print_oled(text) to display text at a specific position.
• After displaying, the Y-coordinate automatically updates to prepare for the next line of text.

Drawing Shapes:

• Use draw_shapes(show_delay) or draw_shape(shape, show_delay) to draw different shapes like rectangles, circles, and triangles on the OLED screen.
• show_delay parameter allows you to control the delay during drawing, which can be useful for adjusting the drawing speed.

Performance Tuning:

• The pixel_threshold value determines how frequently the oled.show() function is called after updating pixels.
• show_delay controls the delay between pixel rendering, allowing fine-tuned control over rendering performance.

Test:

• detailed pinmap of w55rp20 - https://docs.wiznet.io/Product/ioNIC/W55RP20/overview
• w55rp20 datasheet - refere attached in the link below.
• jumper cable connection:
  • w55rp2040's GP9 to ssd1306's SCL
  • w55rp2040's GP8 to ssd1306's SDA
  • w55rp2040's 3V3 to ssd1306's VCC
  • w55rp2040's GND to ssd1306's GND
  • 
• Install the MicroPython uf2 binary provided by wiznet (https://github.com/WIZnet-ioNIC/WIZnet-ioNIC-micropython/releases) in boot mode.(please refer this link for detailed installation instructions:W55RP20-EVB-PICO Redis example, ) Then, in Thonny, add ssd1306.py and ssd1306_test.py files. You can verify the operation by running the ssd1306_test.py file.
• 

Reference:

• W55RP20_ds_v010e.pdf
• adafruit/micropython-adafruit-ssd1306: MicroPython driver for SSD1306 OLED displays.
• SSD1306 description post in Korean
• ssd1306 like product in aliexpress