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DHT22 Sensor Python Code for Orange PI Zero
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phyesix 看全部
2017-3-11 16:49:42
Hi,

I bought the DHT22 sensor, but I could not get it to work in any way. What is wrong in this code block:

code:

  1. #!/usr/bin/env python
  2. from pyA20.gpio import gpio
  3. from pyA20.gpio import port
  4. from pyA20.gpio import connector
  5. from time import sleep

  7. def bin2dec(string_num):
  8.     return str(int(string_num, 2))
  9.    
  10. data = []

  12. #GPIO.setmode(GPIO.BCM)
  13. PIN = port.PA3

  15. gpio.init()
  16. gpio.setcfg(PIN, gpio.OUTPUT)

  18. gpio.output(PIN,gpio.HIGH)
  19. sleep(0.018)
  20. gpio.output(PIN,gpio.LOW)
  21. sleep(0.018)

  23. #gpio.setup(PIN, gpio.IN, pull_up_down=gpio.PUD_UP)
  24. gpio.setcfg(PIN, gpio.INPUT)

  26. for i in range(0,500):
  27.     data.append(gpio.input(PIN))
  28.    
  29.    
  30. bit_count = 0
  31. tmp = 0
  32. count = 0
  33. HumidityBit = ""
  34. TemperatureBit = ""
  35. crc = ""


  38. try:
  39.    while data[count] == 1:
  40.       tmp = 1
  41.       count = count + 1
  42.         

  44.    for i in range(0, 32):
  45.       bit_count = 0
  46.       
  47.       while data[count] == 0:
  48.          tmp = 1
  49.          count = count + 1

  51.       while data[count] == 1:
  52.          bit_count = bit_count + 1
  53.          count = count + 1

  55.       if bit_count > 3:
  56.          if i>=0 and i<8:
  57.             HumidityBit = HumidityBit + "1"
  58.          if i>=16 and i<24:
  59.             TemperatureBit = TemperatureBit + "1"
  60.       else:
  61.          if i>=0 and i<8:
  62.             HumidityBit = HumidityBit + "0"
  63.          if i>=16 and i<24:
  64.             TemperatureBit = TemperatureBit + "0"
  65.             
  66. except:
  67.    print "ERR_RANGE 1"
  68.    exit(0)

  70.    
  71. try:
  72.    for i in range(0, 8):
  73.       bit_count = 0
  74.       
  75.       while data[count] == 0:
  76.          tmp = 1
  77.          count = count + 1

  79.       while data[count] == 1:
  80.          bit_count = bit_count + 1
  81.          count = count + 1

  83.       if bit_count > 3:
  84.          crc = crc + "1"
  85.       else:
  86.          crc = crc + "0"
  87. except:
  88.    print "ERR_RANGE 2"
  89.    exit(0)
  90.       
  91.       
  92. Humidity = bin2dec(HumidityBit)
  93. Temperature = bin2dec(TemperatureBit)

  95. if int(Humidity) + int(Temperature) - int(bin2dec(crc)) == 0:
  96.    print Humidity
  97.    print Temperature
  98. else:
  99.    print "ERR_CRC 3"



nopnop2002 看全部
2017-3-12 05:41:45

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