咸鱼ZTMR实例—显示DTH11温度
显示测试温湿度
主控板:ZTMR1.1开发板
DHT11温湿度模块
0.96oled屏幕
接线说明
接线 | 说明 (3线制) |
---|---|
VCC | 外接3.3V-5V |
GND | 外接GND |
DATA | 小板开关数字量输出接口 接单片机IO口 |
示例代码
#引入相关模块
from pyb import delay
from machine import Pin,I2C
from ssd1306 import SSD1306_I2C
from dht import DHT11
#初始化相关模块
i2c = I2C(sda=Pin("X8"), scl=Pin("X6"))
oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)
#创建DTH11对象dt
dt=DHT11(Pin('Y11'))
delay(1000) #首次启动停顿1秒然传感器稳定
while True:
dt.measure() #温湿度采集
tem=dt.temperature() #获取温度值
hum=dt.humidity() #获取湿度值
oled.fill(0) #清屏背景黑色
oled.text('xianyu', 0, 0)
oled.text('DHT11 test:',0,15)
#温度显示
oled.text(str(tem)+' C',0,40) #使用°C会花屏
#湿度显示
oled.text(str(hum)+' %',48,40)
oled.show()
delay(1000) #每隔1秒采集一次
dht.py
# DHT11/DHT22 driver for MicroPython on ESP8266
# MIT license; Copyright (c) 2016 Damien P. George
try:
from esp import dht_readinto
except:
from pyb import dht_readinto
class DHTBase:
def __init__(self, pin):
self.pin = pin
self.buf = bytearray(5)
def measure(self):
buf = self.buf
dht_readinto(self.pin, buf)
if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]:
raise Exception("checksum error")
class DHT11(DHTBase):
def humidity(self):
return self.buf[0]
def temperature(self):
return self.buf[2]
class DHT22(DHTBase):
def humidity(self):
return (self.buf[0] << 8 | self.buf[1]) * 0.1
def temperature(self):
t = ((self.buf[2] & 0x7f) << 8 | self.buf[3]) * 0.1
if self.buf[2] & 0x80:
t = -t
return t