***** THIS PAGE IS WORK IN PROGRESS *****
Aug 2026

So, I found another 0.96“ LCD to play with, just lying around at home. I figured it would be a bit rude to not give it a go. It is however, slightly different to the one we previously setup.

About the LCD:

• It is still an ssd1306 based display, got this from the label on the packaging.
• It does support I2C, 3 wire SPI and 4 wire SPI. The default resistor settings put it at 4 wire SPI.
• SPI will use 7 wires instead of the 4 wires for I2C.
• SPI has faster refresh than I2C.
• Same 128×64 resolution.
• This version of the LCD does not have the Yellow Blue split.

Because we are using SPI, the Pico will need a new driver as the original driver is for I2C. Before we get in to the Python code, let's have a look at the wiring.

Please see below for the SPI wiring to the Pico Pins.


Below is a more diagrammatic view.


Once you have cabled up your LCD, we can move on to the software.

Before we look at the code, I want to share that there are a few differences between SPI and I2C, have a look at this table below.


So SPI is faster, but there is no addressing, so you cannot chain multiple SPI devices from a single set of Pico GPIO Pins. If you need to run multiple displays, your choice is to either use I2C LCDs, or use multiple sets of SPI pins for each LCD.

I want to look at the old I2C code and compare to the SPI code to point out some differences, this is the Python code that just prints 8 static lines on the LCD for a simple test.

Here is the original I2C code

| download

from machine import Pin, I2C    #Gives access to the I²C Pins. Without it, you couldn’t use GPIO pins or I²C.
import ssd1306
import time
 
i2c = I2C(0, scl=Pin(5), sda=Pin(4), freq=200000)
lcd = ssd1306.SSD1306_I2C(128, 64, i2c)
 
lcd.fill(0)
lcd.text("Yo Tuesday Club!", 0, 0)
lcd.text("SSD1306 LCD",      0, 8)
lcd.text("Address 0x3C",     0, 16)
lcd.text("Cool :)",          0, 24)
lcd.text("Another Line :)",  0, 32)
lcd.text("One More? :)",     0, 40)
lcd.text("Line 7",           0, 48)
lcd.text("Line 8",           0, 56)
lcd.show()
 
time.sleep(300)
lcd.fill(0)
lcd.show()

Here is the same code, but modified to run the SPI LCD Screen.

| download

from machine import Pin, SPI    #Gives access to the SPI Pins. Without it, you couldn’t use GPIO pins or SPI.
from ssd1306_spi import SSD1306_SPI
import time
 
spi = SPI(1, baudrate=8000000, polarity=0, phase=0)
 
dc  = Pin(13, Pin.OUT)
res = Pin(12, Pin.OUT)
cs  = Pin(14, Pin.OUT)
 
oled = SSD1306_SPI(128, 64, spi, dc, res, cs)
 
oled.fill(0)
oled.text("Yo Tuesday Club!", 0, 0)
oled.text("SSD1306 oled",      0, 8)
oled.text("Address 0x3C",     0, 16)
oled.text("Cool :)",          0, 24)
oled.text("Another Line :)",  0, 32)
oled.text("One More? :)",     0, 40)
oled.text("Line 7",           0, 48)
oled.text("Line 8",           0, 56)
oled.show()
 
time.sleep(300)
oled.fill(0)
oled.show()

The second line of each Python script loads some code, there is some difference in how they work:

• import ssd1306 - Loads the entire module, and you have access to all classes within that module.
• from ssd1306_spi import SSD1306_SPI - Loads just the SSD1306_SPI class from the module ssd1306_spi.

• In the first example we used the name lcd - lcd = ssd1306.SSD1306_I2C(128, 64, i2c)
• In the second example we used the name oled - oled = SSD1306_SPI(128, 64, spi, dc, res, cs)

The rest is pretty much the same, from a code perspective there really isn't much difference in the amount of work to get the I2C or SPI LCD displays working.