The SSD1306 OLED screen module is a very common screen module that can use the I2C communication protocol. It can output a maximum image of 128*64 bits, no gray scale, and a single pixel only has two states of on and off. The control logic is relatively simple, which is very suitable for getting started. Learn the project of single-chip microcomputer driving screen display.
A SSD1306 OLED screen module with I²C interface, preferably 128*64 pixels.
After downloading ssd1306.py locally, upload it to the MicroPython device.
| SSD1306 OLED | Board |
|---|---|
GND |
GND |
VCC |
3V3 |
SCL |
16 |
SDA |
15 |
from machine import I2C,Pin
sda_pin=Pin(15,Pin. PULL_UP)
scl_pin=Pin(16,Pin. PULL_UP)
i2c = I2C(1,sda=sda_pin, scl=scl_pin, freq=400_000)
i2c_list = i2c.scan()
i2c_total=len(i2c_list)
print("Total num:",i2c_total)
j=0
for i in i2c_list:
j=j+1
print("NO.{0},address:{1}".format(j,hex(i)))Usually the address of SSD1306 is 0x3c.
from machine import I2C, Pin
from ssd1306 import SSD1306_I2C
sda_pin = Pin(15, Pin.PULL_UP)
scl_pin = Pin(16, Pin.PULL_UP)
i2c = I2C(1, sda=sda_pin, scl=scl_pin, freq=800_000)
print(i2c. scan())
oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)
def display():
# The framebuf library only supports ASCII printing characters encoded as 32~126
oled.text(" !\"#$%&'()*+,-./", 0, 0)
oled.text("0123456789:;<=>?", 0, 8)
oled.text("@ABCDEFGHIJKLMNO", 0, 16)
oled.text("PQRSTUVWXYZ[\]^_", 0, 24)
oled.text("`abcdefghijklmno", 0, 32)
oled.text("pqrstuvwxyz{|}~", 0, 40)
oled. show()
def testAscii():
# The return value of chr() is the ASCII character corresponding to the current integer
Ascii = ''
for i in range(32, 127):
Ascii = Ascii + chr(i)
for i in range(128, 256):
Ascii = Ascii + chr(i)
return Ascii
def display_Ascii():
# The framebuf library only supports ASCII printing characters encoded as 32~126
oled.text(testAscii()[0:16], 0, 0)
oled.text(testAscii()[16:32], 0, 8)
oled.text(testAscii()[32:48], 0, 16)
oled.text(testAscii()[48:64], 0, 24)
oled.text(testAscii()[64:80], 0, 32)
oled.text(testAscii()[80:95], 0, 40)
oled. show()
if __name__ == "__main__":
display()
# print(testAscii())
# display_Ascii()
# ASCII printing characters (character encoding: 32-127)
# 32~126 (95 in total) are characters: 32 is a space, among which 48~57 are ten Arabic numerals from 0 to 9,
# 65～90 are 26 uppercase English letters,
# 97~122 are 26 lowercase English letters,
# The rest are some punctuation marks, operation symbols, etc.
# The 127th character represents the delete command on the keyboard.
# ASCII extension code (character encoding: 128-255)
# The last 128 are called extended ASCII codes.
# Many x86-based systems support the use of extended (or "high") ASCII.
# The extended ASCII code allows the 8th bit of each character
# to be used to determine additional 128 special symbol characters, foreign language letters and graphic symbols.