sgh_PCF8591P.py 文件源码

def __init__(self, busNum):
        #print "init PCF8591"
        if busNum == 0:
            self.__bus = SMBus(0) # on a Rev 1 board
            #print "bus 0"
        else:
            self.__bus = SMBus(1) # on a Rev 2 board
        self.__addr = self.__checkI2Caddress(0x48)
        self.__DACEnabled = 0x00
        print self.readADC() # dummy call to raise exception if no chip presnt on the i2c bus
        print "PCF8591 init completed"

        # self.__bus = __i2cBus
        # self.__addr = self.__checkI2Caddress(__addr)
        # self.__DACEnabled = 0x00


# i2c = SMBus(0) # on a Rev 1 board
# # i2c = SMBus(1) # if on a Rev 2 board

# # Create a PCF8591P object
# sensor = PCF8591P(i2c, 0x48)


    # Read single ADC Channel