B025 - RTC/EEPROM/TMP Python example for the TMP100NA Temp sensorhttp://docs.ciseco.co.uk/RET

i2c_tmp100na.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
""" B025 - RTC/EEPROM/TMP Example for the TMP100NA Temp sensor
    Copyright (c) 2013 Ciseco Ltd.

    Example test code by: Matt Lloyd
    
    Orignal Temp100 Class by Adam Boardman
    Which can be found at 
    https://github.com/adamboardman/eve-alpha-tmp100
    
    Requires python-smbus for i2c interface
    
    This code is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    
"""
import wiringpi2

class Temp100:
    def __init__(self):
        self.defaultAddress = 0b1001000 # 0x48
        self.i2c = wiringpi2.I2C()
        self.dev = self.i2c.setup(self.defaultAddress)

        
        self.tmp100temp   = 0b00
        self.tmp100config = 0b01
        self.tmp100tempL  = 0b10
        self.tmp100tempH  = 0b11
        
        self.tmp100configres   = 0b10011111
        self.tmp100config9bit  = 0b00000000
        self.tmp100config10bit = 0b00100000
        self.tmp100config11bit = 0b01000000
        self.tmp100config12bit = 0b01100000
        
        self.tmp100configShutclear = 0b11111110
        self.tmp100configShutdown  = 0b00000001
    
    def readByteData(self, register):
        return self.i2c.readReg8(self.dev, register)
    
    def readWordData(self, register):
        return self.i2c.readReg16(self.dev, register)
    
    def writeByteData(self, register, value):
        self.i2c.writeReg8(self.dev, register, value)
    
    def getConfiguration(self):
        return self.readByteData(self.tmp100config)
    
    def setShutdown(self):
        config = self.getConfiguration()
        config = config | self.tmp100configShutdown
        self.writeByteData(self.tmp100config,config)
    
    def setShutclear(self):
        config = self.getConfiguration()
        config = config & self.tmp100configShutclear
        self.writeByteData(self.tmp100config,config)
    
    def setResolution9bit(self):
        config = self.getConfiguration()
        config = config & self.tmp100configres
        config = config | self.tmp100config9bit
        self.writeByteData(self.tmp100config,config)
    
    def setResolution10bit(self):
        config = self.getConfiguration()
        config = config & self.tmp100configres
        config = config | self.tmp100config10bit
        self.writeByteData(self.tmp100config,config)
    
    def setResolution11bit(self):
        config = self.getConfiguration()
        config = config & self.tmp100configres
        config = config | self.tmp100config11bit
        self.writeByteData(self.tmp100config,config)
    
    def setResolution12bit(self):
        config = self.getConfiguration()
        config = config & self.tmp100configres
        config = config | self.tmp100config12bit
        self.writeByteData(self.tmp100config,config)
    
    def getTemperature(self):
        tempW = self.readWordData(self.tmp100temp)
        #print "word: "+bin(tempW)
        temp = (tempW&0xFF) + ((tempW>>12)/16.0)
        #print "temp: "+str(temp)
        return temp

if __name__ == "__main__":
    temp = Temp100()
    print("Setting resolution to 12Bits")
    temp.setResolution12bit()
    print("Reading Temperature")
    print("Temp: {}C".format(temp.getTemperature()))