New memory variants were this week launched for the Raspberry Pi Compute Module family. Customers can now specify a 4S with 2GB, 4GB, and 8GB, as well as the original 1GB version.

128x64OLED displayArduino

The OLED display dimensions are set, and I2C communication is established. The adafruit_ssd1306.SSD1306_I2C object is created to interact with the OLED.

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SSD1306OLED128x64

In this lesson, you will learn how to connect a Raspberry Pi with an OLED Display Module (SSD1306) using Python. You’ll learn how to establish I2C communication between the Raspberry Pi and the OLED display, and use the Python Imaging Library (PIL) for creating graphics and text. The lesson will guide you through drawing shapes and text on the OLED screen, providing a practical example with the message “Hello World!”.

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I2C OLED displayArduino

The Raspberry Pi team said the device was for customers "who are looking to retain the same form factor but would like greater computing power and more memory."

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0.96''I2C OLED Display

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Well, it's almost the same form factor. In the hardware documentation [PDF], the team notes: "The CM4S SoC has a slightly increased z-height over the Raspberry Pi Compute Module 3."

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Find the code for this lesson in universal-maker-sensor-kit-main/pi/ directory, or directly copy and paste the code below. Execute the code by running the following commands in terminal:

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While the new hardware is welcome, a Compute Module variant of the Raspberry Pi 5 has yet to be released. Pi supremo Eben Upton told The Register that the hardware design was complete, and the company was still aiming for release in the second half of 2024.

I2C OLED displaydatasheet

The Compute Module 4S turned up earlier this year and was aimed squarely at industrial users. The Compute Module 4 appeared in 2020 with a changed form factor. Its predecessor would plug into a DDR2-SODIMM connector – although it should most definitely not be confused with memory – but the CM4 changed things up a bit.

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The adafruit-circuitpython-ssd1306 library relies on Blinka, so please ensure that Blinka has been installed. To install libraries, refer to Insatll Adafruit_Blinka (CircuitPython) - Optional.

SSD1306OLED displaydatasheet

The PIL(Python Imaging Library) adds image processing capabilities to your Python interpreter. For more detail, please refer to Pillow Handbook.

However, there are plenty of customers who would have been more than happy to have a CM4 that fitted in that old SODIMM slot. Hence the CM4S - "loosely based on the Raspberry Pi 4 Model B," according to the company.

The default font is loaded, and a function to calculate the text size is defined. Then, “Hello World!” is centered and drawn on the image buffer.

SSD1306OLED displayArduino

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Here, we import the libraries needed for the project. board is for interfacing with the Raspberry Pi hardware, PIL for image processing, and adafruit_ssd1306 for controlling the OLED display.

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128x64OLED displaydatasheet

Display Resolution Table · DP 1.4 + DP 1.4: FHD (1920 x 1080) @60 Hz · DP 1.4 + HDMI 2.0: FHD (1920 x 1080) @60 Hz · DP 1.4 + MFDP Type-C: FHD (1920 x 1080) @60 Hz.

The Compute Module has proven to be a popular device for industrial users, with a fair few turning up in hardware such as digital signage. As such, the concept of a drop-in replacement has a certain appeal.

Before running the code, please make sure that you have activated the virtual Python environment with blinka installed. You can activate the virtual environment using a command like this:

Please ensure that you have installed the Python library required for running the code according to the “Install Library” steps.

A CM4SLite variant also turned up - seemingly earlier this year - , supplied without the eMMC storage fitted, but 1GB of RAM was all that was available at launch. 2GB, 4GB, and 8GB variants are now also in the line-up. Prices start at $25 per unit, and the boards are supplied only in 200-unit boxes.