Hardware Reference
In-Depth Information
wordval = self.i2c.readU16(reg)
newval = self.i2c.reverseByteOrder(wordval)
if (self.debug):
print("I2C: Device 0x%02X returned 0x%04X from reg 0x%02X"
% (self.address, wordval & 0xFFFF, reg))
return newval
except IOError:
print("Error accessing 0x%02X: Check your I2C address" %
self.address)
return -1
def readFull(self, reg=0x8C):
"""Reads visible+IR diode from the I2C device"""
return self.readWord(reg);
def readIR(self, reg=0x8E):
"""Reads IR only diode from the I2C device"""
return self.readWord(reg);
def getLux(self, gain = 0):
"""Grabs a lux reading either with autoranging (gain=0) or with a
specified gain (1, 16)"""
if (gain == 1 or gain == 16):
self.setGain(gain) # low/highGain
ambient = self.readFull()
IR = self.readIR()
elif (gain==0): # auto gain
self.setGain(16) # first try highGain
ambient = self.readFull()
if (ambient < 65535):
IR = self.readIR()
if (ambient >= 65535 or IR >= 65535): # value(s) exeed(s) data
range
self.setGain(1) # set lowGain
ambient = self.readFull()
IR = self.readIR()
if (self.gain==1):
ambient *= 16 # scale 1x to 16x
IR *= 16 # scale 1x to 16x
ratio = (IR / float(ambient)) # changed to make it run under python
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