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Micropython ESP频道

micropython驱动ESP32结合DHT11和SSD1306OLED屏幕实现温湿度计实时显示


main.py:

from machine import Pin, I2C
from time import sleep
import ssd1306
from machine import Pin
import dht
dht1 = dht.DHT11(Pin(8))
#pwr = Pin(18,Pin.OUT)
#pwr.on()
ti=1
i2c = I2C(scl=Pin(5),sda=Pin(4))
s=i2c.scan
print(s)
oled_width = 128
oled_height = 64
while(True):
    oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
    ti=ti+1
    try:
        dht1.measure()
        print("温度为: " + str(dht1.temperature()) + '℃')
        print("湿度为: " + str(dht1.humidity()) + '%')
        tem = int(dht1.temperature())
        hum = int(dht1.humidity())
    except:
        tem = 25
        hum = 50
    oled.text('T='+str(tem)+'C', 0, 0)
    oled.text('s='+str(hum)+'%', 0, 10)
    oled.text(str(ti), 0, 20)
    if(ti<5):#这里可以直接删掉
        oled.text('BY YangYou', 30, 20)#当然也可以替换成自己的开机动画
    oled.show()
    sleep(1)#这里是刷新速度(单位秒)


ssd1306.py    :#(参照官方的删减版仅保留I2C)

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
        self.poweron()
        self.init_display()
    def init_display(self):
        for cmd in (
            SET_DISP | 0x00, # off
            SET_MEM_ADDR, 0x00, # horizontal
            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
            SET_CONTRAST, 0xff, # maximum
            SET_ENTIRE_ON, # output follows RAM contents
            SET_NORM_INV, # not inverted
            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)
        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):
        self.i2c.writeto(self.addr, self.buffer)
    def poweron(self):
        pass


作者:洋洋柚Y https://www.bilibili.com/read/cv18461337?spm_id_from=333.999.0.0 出处:bilibili



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