nanopineo 用pyhton 测量 DHT11的值，发送了采集命令，收不到DHT11的相应

按照DHT11手册发送了开机命令，收不到响应，一直读出的是本身的高电平。请大家指教。
import gpio,time
j=0
data=[]

gpio.setwarnings(False)
gpio.setmode(gpio.BCM)
time.sleep(1)
channel= 203
gpio.setup(channel,gpio.OUT)
gpio.set(channel,0)
time.sleep(0.025)
gpio.set(channel,1)
time.sleep(0.00003)
gpio.setup(channel,gpio.IN)

#while gpio.input(channel)==1:
    #print "low1231231113124314334444444444444"
    #continue
while gpio.input(channel)==0:
    print "check low12"
    continue
while gpio.input(channel)==1:
    print "check high123123111"
    continue
while j<40:
    k=0
    while gpio.input(channel)==0:
        continue

    while gpio.input(channel)==1:
        k+=1
        if k>100:break
    if k<12:
        data.append(0)

else:
        data.append(1)
    j+=1

print "Sensor is working"
#get temperature
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 is ", temperature,"wet is ",humidity,"%"
else:
    print "something is worong the humidity,humidity_point,temperature,temperature_point,check is",humidity,humidity_point,temperature,temperature_point,check