Raspberry Pi 0.91 128x32 SSD1306 OLED User Guide

【Download】

[] Schematic

[] ssd1306_oled_128x32.py

[] bad_apple_128x32.gif

【Preparatory work】

Before you begin, you need the following items:

[] Raspberry Pi

[] SSD1306 OLED Screen -I2C display interface

[] Python

Hardware connection

Run I2C interface

Restart the Raspberry Pi after ensuring that the I2C interface is turned on.

Find I2C device address

You can use the following command to find the address of the I2C device connected to the raspberry pi:

sudo i2cdetect -y 1

The running result is as shown in the figure (the default i2c address of ssd1306oled is 0x3c).

Install luma.oled library

Next, you need to install the luma.oled library on the raspberry pi. You can install in the terminal by the following command:

sudo pip3 install luma.oled

Test Python program

Before running the code, you need to create a new python file named SSD 1306 _ OLED _ 128X32 _ bad _ apple.py in Raspberry Pi (the file name can be customized).

sudo nano ssd1306_oled_128x32_bad_apple.py

Combine the above steps, and drive the SSD1306 OLED screen with luma.oled library. The following is a complete Python program for driving the SSD1306 OLED screen on Raspberry Pi:

import os

import time

import threading

from PIL import Image, ImageSequence

from PIL import ImageFont, ImageDraw

from luma.core.interface.serial import i2c

from luma.core.render import canvas

from luma.oled.device import ssd1306

serial = i2c(port=1, address=0x3C)

device = ssd1306(serial, width=128, height=32)

# Return CPU temperature as a character string

def getCPUtemperature():

    res = os.popen('vcgencmd measure_temp').readline()

    return(res.replace("temp=","").replace("'C\n",""))

# Return RAM information (unit=kb) in a list

# Index 0: total RAM

# Index 1: used RAM

# Index 2: free RAM

def getRAMinfo():

    p = os.popen('free')

    i = 0

    while 1:

        i = i + 1

        line = p.readline()

        if i==2:

            return(line.split()[1:4])

# Return % of CPU used by user as a character string

def getCPUuse():

    return(str(os.popen("top -n1 | awk '/Cpu\(s\):/ {print $2}'").readline().strip()))

# Return information about disk space as a list (unit included)

# Index 0: total disk space

# Index 1: used disk space

# Index 2: remaining disk space

# Index 3: percentage of disk used

def getDiskSpace():

    p = os.popen("df -h /")

    i = 0

    while 1:

        i = i +1

        line = p.readline()

        if i==2:

            return(line.split()[1:5])

def draw_text(text, width, height, fontsize):

    font = ImageFont.truetype("arial.ttf", fontsize)

    with canvas(device) as draw:

        draw.rectangle(device.bounding_box, outline="white", fill="black")

        # Calculate the width of the text using textlength() instead of textsize()

        w = font.getlength(text)

        # Calculate the height of the text by subtracting the font descent from the font ascent

        ascent, descent = font.getmetrics()

        h = ascent - descent

        # Calculate the position of the text

        x = (width - w) // 2

        y = (height - h) // 2

        # Draw the text using the new width and height values

        draw.text((10, 1), text, font=font, fill="white")

def image_gif():

    # Display each image with an idea

    for frame in frames:

        device.display(frame)

        time.sleep(0.01)

def computer_resources(flag):

    while not flag.is_set():

        # CPU informatiom

        CPU_use = getCPUuse()

        CPU_tmp = getCPUtemperature()

        # RAM information

        # Output is in kb, here I convert it in Mb for readability

        RAM_stats = getRAMinfo()

        RAM_total = round(int(RAM_stats[0]) / 1000,1)

        RAM_used = round(int(RAM_stats[1]) / 1000,1)

        RAM_free = round(int(RAM_stats[2]) / 1000,1)

        # Disk information

        DISK_stats = getDiskSpace()

        DISK_total = DISK_stats[0]

        DISK_used = DISK_stats[1]

        DISK_perc = DISK_stats[3]

        #

        status_text = "CPU_use:  "+CPU_use+"\nCPU_tmp:  "+CPU_tmp

        draw_text(status_text, device.width, device.height, 12)

if __name__ == '__main__':

    # Open a GIF file and create an Image object for each frame

    frames = []

    with Image.open("./bad_apple_128x32.gif") as img:

        for frame in ImageSequence.Iterator(img):

            frames.append(frame.convert("1").resize((128,32)))

    # Create a threading.Event() object for synchronization

    flag = threading.Event()

    # Create a thread to compute system resources usage

    t = threading.Thread(target=computer_resources,args=(flag,))

    while True:

        # Show some text and wait for 2 seconds

        draw_text("www.spotpear.cn\nhttp://www.spotpear.com\n", device.width, device.height, 12)

        time.sleep(2)

        #Start the thread to compute system resources usage,wait for 5 seconds

        t.start()

        time.sleep(5)

        # Set the flag to stop the thread

        flag.set()

        # Wait for the thread to terminate

        t.join()

        # Clear the flag and create a new thread for next loop

        flag.clear()

        t = threading.Thread(target=computer_resources,args=(flag,))

        time.sleep(2)

        # Display Bad Apple animation as GIF images

        image_gif()

Note that we used the address "0x3C" in the i2c object, which is the default SSD1306 OLED screen address. If you are using other types of i2c devices, use the command sudo i2cdetect -y 1 to find its address and replace it with the address in the I2C object.

This program realizes the display effect of gif, so it must have a corresponding gif file, otherwise the program can't run normally.

How to convert a video into a gif refer to this tutorial: Converting MP4 video into gif

Program execution effect

Input the above code into python file, save and exit, and input the following code in Raspberry Pi terminal to execute the program:

sudo python3 ssd1306_oled_128x32_bad_apple.py

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com