四针脚0.96英寸OLED显示屏模块的具体参数如下表所示。
|----------|------------|
| 参数名称 | 参数特性 |
| 分辨率 | 128x64像素 |
| 通信方式 | IIC |
| 驱动芯片 | SSD1306 |
| 屏幕颜色 | 白色、蓝色或黄蓝双色 |
元件：
- 四针脚0.96英寸OLED显示屏模块
- ESP32 DEVKIT_C开发板
- 杜邦线
- USB Type-C
接线：
|----------------|-------|
| ESP32 DEVKIT_C | DHT11 |
| VIN或3V3 | VCC |
| GND | GND |
| D25 | SCL |
| D26 | SDA |
注：OLED中的SCL和SDA引脚也可以连接到ESP32中的其他硬/软件IIC引脚，只需在代码中做出相应的配置。
制作任意字符点阵：
取模软件：
https://download.csdn.net/download/qq_44955826/90075081?spm=1001.2014.3001.5501
取模方法可参考该博客：
micropython oled中文_MicroPython实例之TPYBoard开发板控制OLED显示中文-CSDN博客
代码：
python
import time
from machine import Pin
from SSD1306 import SSD1306_I2C
from machine import I2C
#i2c = I2C(0) #初始化IIC0，使用默认引脚"SCL=18、SDA=19"，传输速度：400 Kbps
i2c = I2C(1) #初始化IIC1，使用默认引脚"SCL=25、SDA=26"，传输速度：400 Kbps
#from machine import SoftI2C
#i2c = SoftI2C(scl=Pin(5), sda=Pin(4), freq=100000)
#i2c = SoftI2C(scl=Pin(33), sda=Pin(32), freq=400000)
OLED = SSD1306_I2C(128, 64, i2c) #屏幕长度：128像素；屏幕宽度：64像素
#用到的UTF-8编码字库
fonts = {
0xE6B8A9: #"温"的UTF-8编码
[0x00,0x23,0x12,0x12,0x83,0x42,0x42,0x13,0x10,0x27,0xE4,0x24,0x24,0x24,0x2F,0x00,
0x00,0xF8,0x08,0x08,0xF8,0x08,0x08,0xF8,0x00,0xFC,0xA4,0xA4,0xA4,0xA4,0xFE,0x00], #温
0xE6B9BF:
[0x00,0x27,0x14,0x14,0x87,0x44,0x44,0x17,0x11,0x21,0xE9,0x25,0x23,0x21,0x2F,0x00,
0x00,0xF8,0x08,0x08,0xF8,0x08,0x08,0xF8,0x20,0x20,0x24,0x28,0x30,0x20,0xFE,0x00], #湿
0xE5BAA6:
[0x01,0x00,0x3F,0x22,0x22,0x3F,0x22,0x22,0x23,0x20,0x2F,0x24,0x42,0x41,0x86,0x38,
0x00,0x80,0xFE,0x20,0x20,0xFC,0x20,0x20,0xE0,0x00,0xF0,0x10,0x20,0xC0,0x30,0x0E], #度
0xE58589:
[0x01,0x21,0x11,0x09,0x09,0x01,0xFF,0x04,0x04,0x04,0x04,0x08,0x08,0x10,0x20,0xC0,
0x00,0x08,0x08,0x10,0x20,0x00,0xFE,0x40,0x40,0x40,0x40,0x42,0x42,0x42,0x3E,0x00], #光
0xE785A7:
[0x00,0x7D,0x44,0x44,0x44,0x44,0x7D,0x44,0x44,0x44,0x44,0x7C,0x00,0x48,0x44,0x84,
0x00,0xFC,0x44,0x44,0x44,0x94,0x08,0xFC,0x84,0x84,0x84,0xFC,0x00,0x88,0x44,0x44], #照
0xE7839F:
[0x10,0x13,0x12,0x16,0x5A,0x52,0x53,0x92,0x12,0x12,0x12,0x2A,0x27,0x42,0x43,0x82,
0x00,0xFE,0x02,0x22,0x22,0x22,0xFE,0x22,0x22,0x52,0x4A,0x8A,0x02,0x02,0xFE,0x02], #烟
0xE99BBE:
[0x00,0x3F,0x01,0x7F,0x49,0x01,0x1D,0x08,0x1F,0x68,0x07,0x7A,0x0F,0x04,0x18,0x00,
0x00,0xF8,0x00,0xFC,0x24,0x00,0x70,0x00,0xF0,0x20,0xC0,0x3C,0xE0,0x20,0xC0,0x00], #雾
0xE28483:
[0x00,0x00,0x00,0x00,0x20,0x33,0x04,0x08,0x08,0x08,0x08,0x07,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x80,0x40,0x00,0x00,0x00,0x40,0x80,0x00,0x00,0x00,0x00], #℃
}
#先找出字符的utf-8编码，再在fonts中找到对应的点阵，最后将点阵输出到OLED上，从而实现在OLED上显示汉字和特殊字符
def chinese(ch_str, x_axis, y_axis):
offset_ = 0
for k in ch_str:
code = 0x00 # 将中文转成16进制编码
data_code = k.encode("utf-8")
code |= data_code[0] << 16
code |= data_code[1] << 8
code |= data_code[2]
byte_data = fonts[code]
for y in range(0, 16):
a_ = bin(byte_data[y]).replace('0b', '')
while len(a_) < 8:
a_ = '0'+ a_
b_ = bin(byte_data[y+16]).replace('0b', '')
while len(b_) < 8:
b_ = '0'+ b_
for x in range(0, 8):
OLED.pixel(x_axis + offset_ + x, y+y_axis, int(a_[x]))
OLED.pixel(x_axis + offset_ + x +8, y+y_axis, int(b_[x]))
offset_ += 16
while True:
chinese('温度', 0, 0)
OLED.text(':23.67', 32, 5) #在第35行和第5列像素的位置存入字符":23.67"
chinese('℃', 80, 0)
chinese('湿度', 0, 16)
OLED.text(':53%', 32, 21)
OLED.show() #将上述存入到SSD1306芯片中的字符显示到屏幕上
time.sleep(1)
OLED.fill(0) # 清屏
chinese('光照', 0, 32)
OLED.text(':12345LX', 32, 37)
chinese('烟雾', 0, 48)
OLED.text(':1234', 32, 53)
OLED.show()
time.sleep(1)
OLED.fill(0)
OLED.text('NO CLEAR SCREEN', 0, 5) #不清屏的后果
python
#MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruit
import time
import framebuf
# register definitions
SET_CONTRAST = const(0x81)
SET_ENTIRE_ON = const(0xa4)
SET_NORM_INV = const(0xa6)
SET_DISP = const(0xae)
SET_MEM_ADDR = const(0x20)
SET_COL_ADDR = const(0x21)
SET_PAGE_ADDR = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP = const(0xa0)
SET_MUX_RATIO = const(0xa8)
SET_COM_OUT_DIR = const(0xc0)
SET_DISP_OFFSET = const(0xd3)
SET_COM_PIN_CFG = const(0xda)
SET_DISP_CLK_DIV = const(0xd5)
SET_PRECHARGE = const(0xd9)
SET_VCOM_DESEL = const(0xdb)
SET_CHARGE_PUMP = const(0x8d)
class SSD1306:
def __init__(self, width, height, external_vcc):
self.width = width
self.height = height
self.external_vcc = external_vcc
self.pages = self.height // 8
# Note the subclass must initialize self.framebuf to a framebuffer.
# This is necessary because the underlying data buffer is different
# between I2C and SPI implementations (I2C needs an extra byte).
self.poweron()
self.init_display()
def init_display(self):
for cmd in (
SET_DISP | 0x00, # off
# address setting
SET_MEM_ADDR, 0x00, # horizontal
# resolution and layout
SET_DISP_START_LINE | 0x00,
SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
SET_MUX_RATIO, self.height - 1,
SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
SET_DISP_OFFSET, 0x00,
SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
# timing and driving scheme
SET_DISP_CLK_DIV, 0x80,
SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
SET_VCOM_DESEL, 0x30, # 0.83*Vcc
# display
SET_CONTRAST, 0xff, # maximum
SET_ENTIRE_ON, # output follows RAM contents
SET_NORM_INV, # not inverted
# charge pump
SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
SET_DISP | 0x01): # on
self.write_cmd(cmd)
self.fill(0)
self.show()
def poweroff(self):
self.write_cmd(SET_DISP | 0x00)
def contrast(self, contrast):
self.write_cmd(SET_CONTRAST)
self.write_cmd(contrast)
def invert(self, invert):
self.write_cmd(SET_NORM_INV | (invert & 1))
def show(self):
x0 = 0
x1 = self.width - 1
if self.width == 64:
# displays with width of 64 pixels are shifted by 32
x0 += 32
x1 += 32
self.write_cmd(SET_COL_ADDR)
self.write_cmd(x0)
self.write_cmd(x1)
self.write_cmd(SET_PAGE_ADDR)
self.write_cmd(0)
self.write_cmd(self.pages - 1)
self.write_framebuf()
def fill(self, col):
self.framebuf.fill(col)
def pixel(self, x, y, col):
self.framebuf.pixel(x, y, col)
def scroll(self, dx, dy):
self.framebuf.scroll(dx, dy)
def text(self, string, x, y, col=1):
self.framebuf.text(string, x, y, col)
class SSD1306_I2C(SSD1306):
def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
self.i2c = i2c
self.addr = addr
self.temp = bytearray(2)
# Add an extra byte to the data buffer to hold an I2C data/command byte
# to use hardware-compatible I2C transactions. A memoryview of the
# buffer is used to mask this byte from the framebuffer operations
# (without a major memory hit as memoryview doesn't copy to a separate
# buffer).
self.buffer = bytearray(((height // 8) * width) + 1)
self.buffer[0] = 0x40 # Set first byte of data buffer to Co=0, D/C=1
self.framebuf = framebuf.FrameBuffer1(memoryview(self.buffer)[1:], width, height)
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.temp[0] = 0x80 # Co=1, D/C#=0
self.temp[1] = cmd
self.i2c.writeto(self.addr, self.temp)
def write_framebuf(self):
# Blast out the frame buffer using a single I2C transaction to support
# hardware I2C interfaces.
self.i2c.writeto(self.addr, self.buffer)
def poweron(self):
pass
class SSD1306_SPI(SSD1306):
def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
self.rate = 10 * 1024 * 1024
dc.init(dc.OUT, value=0)
res.init(res.OUT, value=0)
cs.init(cs.OUT, value=1)
self.spi = spi
self.dc = dc
self.res = res
self.cs = cs
self.buffer = bytearray((height // 8) * width)
self.framebuf = framebuf.FrameBuffer1(self.buffer, width, height)
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs.high()
self.dc.low()
self.cs.low()
self.spi.write(bytearray([cmd]))
self.cs.high()
def write_framebuf(self):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs.high()
self.dc.high()
self.cs.low()
self.spi.write(self.buffer)
self.cs.high()
def poweron(self):
self.res.high()
time.sleep_ms(1)
self.res.low()
time.sleep_ms(10)
self.res.high()现象：
