最近在學習python,最近也買了塊樹莓派（raspberry 3 b）,講不清是為了學習python而買的pi，還是為了鼓搗pi而去學習python。
昨天晚上按照教程自己搭建了乙個溫濕度測試平台，**主要也是在網上找的，我沒有仔細去看dh11的原理，大概和ds18b20是乙個套路吧。先能把**跑起來，再返回頭看**吧。這能操作gpio的基礎，將來做個跑馬燈，控制數碼管，繼電器，步進電機都離不開它。
~~~啥時候能支援markdown呢？
引腳號名稱型別說明1
vcc電源
+級，輸入3v-5.5v
2data
資料輸出
輸出引腳
3gnd
接地接地引腳
****
```#!/usr/bin/python
import rpi.gpio as gpio
import time
channel =4
data =
j = 0
gpio.setmode(gpio.bcm)
time.sleep(1)
gpio.setup(channel, gpio.out)
gpio.output(channel, gpio.low)
time.sleep(0.02)
gpio.output(channel, gpio.high)
gpio.setup(channel, gpio.in)
while gpio.input(channel) == gpio.low:
continue
while gpio.input(channel) == gpio.high:
continue
while j < 40:
k = 0
while gpio.input(channel) == gpio.low:
continue
while gpio.input(channel) == gpio.high:
k += 1
if k > 100:
break
if k < 8:
else:
j += 1
print "sensor is working."
print data
humidity_bit = data[0:8]
humidity_point_bit = data[8:16]
temperature_bit = data[16:24]
temperature_point_bit = data[24:32]
check_bit = data[32:40]
humidity = 0
humidity_point = 0
temperature = 0
temperature_point = 0
check = 0
for i in range(8):
humidity += humidity_bit[i] * 2 ** (7-i)
humidity_point += humidity_point_bit[i] * 2 ** (7-i)
temperature += temperature_bit[i] * 2 ** (7-i)
temperature_point += temperature_point_bit[i] * 2 ** (7-i)
check += check_bit[i] * 2 ** (7-i)
tmp = humidity + humidity_point + temperature + temperature_point
if check == tmp:
print "temperature :", temperature, "*c, humidity :", humidity, "%"
else:
print "wrong"
print "temperature :", temperature, "*c, humidity :", humidity, "% check :", check, ", tmp :", tmp
gpio.cleanup()
```
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