#12 라즈베리파이 온습도 센서

//

일시 : 2018.01.11

내용 : 온,습도 센서

//

I2C TEMP / HUMI

• 온습도 센서

• Read_address와 Write_address가 다름

• Datasheet 참고

실습

- 현재 온,습도 출력

  
  import smbus2 as smbus
  import time
  ​
  bus = smbus.SMBus(1)
  addr = 0x40
  ​
  cmd_temp = 0xf3
  cmd_humi = 0xf5
  soft_reset = 0xfe
  temp = 0.0
  humi = 0.0
  val = 0
  data = [0, 0]
  ​
  try:
      bus.write_byte (addr, soft_reset)
      time.sleep(0.05)
  ​
      # myMotor = motor()
      while True:
          # temperature
          bus.write_byte(addr, cmd_temp) # 온도를읽어라
          time.sleep(0.260)  # 데이터시트에 정해져있는 시간
          
          for i in range(0,2,1):
              data[i] = bus.read_byte(addr)
  ​
          val = data[0] << 8 | data[1]
          temp = -46.85+175.72/65536*val
          
          # humidity
          bus.write_byte(addr, cmd_humi)
          time.sleep(0.260)
          
          for i in range(0,2,1):
              data[i] = bus.read_byte(addr)
  ​
          val = data[0] << 8 | data[1]
          humi = -6.0+125.0/65536*val;
  ​
          print 'temp : %.2f, humi : %.2f' %(temp, humi)
          time.sleep(1)
          # myMotor.humid_check(temp, humi)
  ​
  except KeyboardInterrupt:
      pass
  ​

- 모터와 연동

  
  import RPi.GPIO as GPIO
  import time
  ​
  class motor :
      GPIO.setmode(GPIO.BCM)
      GPIO.setwarnings(False)
      
      GPIO_RP = 4
      GPIO_RN = 25
      GPIO_EN = 12
      
      
      def __init__(self) :
          GPIO.setup(self.GPIO_RP, GPIO.OUT)
          GPIO.setup(self.GPIO_RN, GPIO.OUT)
          GPIO.setup(self.GPIO_EN, GPIO.OUT)
  ​
      def humid_check(self, temp, humi):
          print ('temp : %.2f, humi : %.2f' %(temp, humi))
          time.sleep(0.01)
          
          if (humi < 40) :
              ##stop
              GPIO.output(self.GPIO_RP, False)
              GPIO.output(self.GPIO_RN, False)
              GPIO.output(self.GPIO_EN, True)
              time.sleep(1)
          elif (humi <= 50):
              ##cw
              GPIO.output(self.GPIO_RP, True)
              GPIO.output(self.GPIO_RN, False)
              GPIO.output(self.GPIO_EN, True)
              time.sleep(1)
          else :
              ##ccw
              GPIO.output(self.GPIO_RP, False)
              GPIO.output(self.GPIO_RN, True)
              GPIO.output(self.GPIO_EN, True)
              time.sleep(1)

- 클래스 연습

  
  import smbus2 as smbus
  import time
  ​
  class tempHumi:
      
      def __init__(self):
          self.bus = smbus.SMBus(1)
          self.addr = 0x40
          soft_reset = 0xfe
          self.bus.write_byte (self.addr, soft_reset)
          time.sleep(0.05)
  ​
      def readTemp(self):
          # temperature
          cmd_temp = 0xf3
          temp = 0.0
          data = [0, 0]
          self.bus.write_byte(self.addr, cmd_temp)
          time.sleep(0.260)
          
          for i in range(0,2,1):
              data[i] = self.bus.read_byte(self.addr)
  ​
          val = data[0] << 8 | data[1]
          temp = -46.85+175.72/65536*val
          return temp
  ​
      def readHumi(self):
          # humidity
          cmd_humi = 0xf5
          humi = 0.0
          data = [0, 0]
          self.bus.write_byte(self.addr, cmd_humi)
          time.sleep(0.260)
          
          for i in range(0,2,1):
              data[i] = self.bus.read_byte(self.addr)
  ​
          val = data[0] << 8 | data[1]
          humi = -6.0+125.0/65536*val;
          return humi
      
  try:
      if __name__ == "__main__":
          
          iTempHumi=tempHumi()
          
          while True:
              temp=iTempHumi.readTemp()
              print("temp : %d" % temp, end=", ")
              
              humi=iTempHumi.readHumi()
              print("humi : %d" % humi)
              time.sleep(1)
              
  except KeyboardInterrupt:
      pass
  finally:
      pass