[Python知识库]ESP8266/ESP32 + MicroPython （三） 几个实验

?不是什么高科技，网上可以搜到很多，不过 MicroPython 比较乱，不同的开发板有些细微的差别，库也是千差万别。以下为实测通过的。

# 闪灯 （on off 电平反的）
import machine
import time
led = machine.Pin(2, machine.Pin.OUT)
while True:
    led.off()
    time.sleep(0.1)
    led.on()
    time.sleep(0.1)
    led.off()
    time.sleep(0.1)
    led.on()
    time.sleep(1)

# DHT11
import dht
import machine
d = dht.DHT11(machine.Pin(16))
d.measure()
print(d.temperature() ,d.humidity())

# DHT22
import dht
import machine
d = dht.DHT22(machine.Pin(16))
d.measure()
print(d.temperature() ,d.humidity())

# AHT10（I2C） （配合库 ahtx0.py   来源 https://pypi.org/project/micropython-ahtx0/#description ）
import utime
from machine import Pin, I2C
import ahtx0
# I2C for the Wemos D1 Mini with ESP8266
i2c = I2C(scl=Pin(4), sda=Pin(5))    # 注意例程居然是反的，可能是针对其他开发板吧
# Create the sensor object using I2C
sensor = ahtx0.AHT10(i2c)
while True:
    print("\nTemperature: %0.2f C" % sensor.temperature)
    print("Humidity: %0.2f %%" % sensor.relative_humidity)
    utime.sleep(5)

# OLED  默认是 8x8 字体，暂时还没办法改！
from machine import I2C,Pin
from ssd1306 import SSD1306_I2C
import time
i2c = I2C(scl = Pin(4),sda = Pin(5),freq = 10000) #软件I2C
oled = SSD1306_I2C(128, 64, i2c) #创建oled对象
oled.rect(0,0,127,63,1)
oled.show()
oled.text("Hello World!",15,25)
oled.show()
time.sleep(1)  
oled.fill(0)    # clear
oled.show()

### OLED 直插 GPIO16开始的4个脚
from machine import I2C,Pin
from ssd1306 import SSD1306_I2C
import time
p16 = Pin(16, Pin.OUT)   # OLED Vcc
p16.value(1)  
p5 = Pin(5, Pin.OUT)     # OLED Gnd
p5.value(0)   
i2c = I2C(scl = Pin(4),sda = Pin(0))   #软件I2C
oled = SSD1306_I2C(128, 64, i2c)     #创建oled对象
oled.rect(0,0,127,63,1)
oled.show()
oled.text("Hello World!",15,30)
oled.show()

?能不接线就不接嘛，条件是买 NodeMCU 要买没有焊排针的，自己焊排母。这样就有一些 UNO 的便利了。

?

?

# OLED + AHT10  胶水代码
from machine import Pin, I2C
from ssd1306 import SSD1306_I2C
import ahtx0
import utime
import time
i2c = I2C(scl=Pin(4), sda=Pin(5))
print('I2C devices',i2c.scan())
sensor = ahtx0.AHT10(i2c)
oled = SSD1306_I2C(128, 64, i2c) 
while True:
    tmp = int(sensor.temperature * 100)/100
    hum = int(sensor.relative_humidity * 100)/100
    print("\nTemperature: %0.2f C" % tmp)
    oled.invert(1)  # 有这一行全屏反白显示，注释掉取消反白
    print("Humidity:    %0.2f %%" % hum)  
    oled.fill(0)    # clear
    oled.show()
    oled.text(str(tmp),15,10)  # 浮点转字符串str()
    oled.text(str(hum),15,40)
    oled.show()    
    utime.sleep(5)