sudo apt-get update && sudo apt-get -y install i2c-tools <\/code>\n*Enable I2c function by editing \/boot\/config.txt,make sure it contain this two parameter as following:\n\ndevice_tree=bcm2710-rpi-3-b.dtb<\/code>\n\ndtparam=i2c_arm=on<\/code>\n**Or you can use this command to enable I2C:\n\nsudo raspi-config<\/code>\n\n[thumb|left|800px](\/docs\/File:Lm75.png)\n
\n**Select as this picture, then you can enable I2C easily.\n[thumb|left|800px](\/docs\/File:Lm752.png)\n
\n*Please Remember to reboot your Raspberry Pi.\n*After rebooting, please open a terminal and input this command to get temperature:\n\n\ni2cget -y 1 0x48 0x00 w |awk '{printf(\"%0.1f C\\n\",(a=(((\"0x\"substr($1,5,2)substr($1,3,1))*0.0625)+0.1) )>128?a-256:a)}'\n<\/code>\n\nResult:\n\n[thumb|left|800px](\/docs\/File:Lm753.png)\n
\n----",
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"title": "EP-0031",
"rev_id": 10883,
"heading_path": "Examples",
"chunk_index": 9,
"content": "*Shell scripts:\n\nYou can create a file called lm75.sh and edit as following:\n\n#!\/bin\/bash\n\nwhile true\n\ndo\n\ni2cget -y 1 0x48 0x00 w | awk '{printf(\"%.1f C.\\n\", (a=(((\"0x\"substr($1,5,2)substr($1,3,1))*0.0625)+0.1) )>128?a-256:a)}'\n\nsleep 1\n\ndone<\/code>\n\nand set an execute right to this file:\n\nchmod +x lm75.sh && bash lm75.sh<\/code>\n\n----\n*C code: You can login to your Raspberry Pi and open a terminal, and then download the zip package from this link below:\n[File:LM75_C.tar.gz.zip ](\/docs\/File:LM75_C.tar.gz.zip )\n\nunzip it and compile it.\n\n\nunzip LM75_C.tar.gz.zip\n\ntar -xf LM75_C.tar.gz\n\ncd LM75_C\/\n\nmake\n\n.\/test.o\n\n<\/code>\n[thumb|left|800px](\/docs\/File:Lm75c.png)\n
\n----\n*Python running in command line:\n\n**If you want to use python to drive this sensor, you have to install this two packages first.\nsudo apt-get update<\/code>\n\nsudo apt-get install -y python-smbus python-scipy<\/code>\n\n**Create a file called LM75.py as below:\n\nimport time\nimport smbus\n\nLM75_ADDRESS\t\t = 0x48\n\nLM75_TEMP_REGISTER \t = 0\nLM75_CONF_REGISTER \t = 1\nLM75_THYST_REGISTER \t = 2\nLM75_TOS_REGISTER \t = 3",
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"title": "EP-0031",
"rev_id": 10883,
"heading_path": "Examples",
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"content": "LM75_CONF_SHUTDOWN \t = 0\nLM75_CONF_OS_COMP_INT \t = 1\nLM75_CONF_OS_POL \t = 2\nLM75_CONF_OS_F_QUE \t = 3\n\nclass LM75(object):\n\tdef (self, mode=LM75_CONF_OS_COMP_INT, address=LM75_ADDRESS, busnum=1):\n\t\tself._mode = mode\n\t\tself._address = address\n\t\tself._bus = smbus.SMBus(busnum)\n\ndef regdata2float (self, regdata):\n\t\treturn (regdata \/ 32.0) \/ 8.0\n\tdef toFah(self, temp):\n\t\treturn (temp * (9.0\/5.0)) + 32.0\n\ndef getTemp(self):\n\t\traw = self._bus.read_word_data(self._address, LM75_TEMP_REGISTER) & 0xFFFF\n\t\traw = ((raw << 8) & 0xFF00) + (raw >> 8)\n\t\treturn self.toFah(self.regdata2float(raw))\n<\/pre>\nand then create another file called test.py:\n\n\nimport LM75\n\nsensor = LM75.LM75()\n\nprint sensor.getTemp()\n<\/pre>\n**execute by this command:\n\npython test.py<\/code>\n[thumb|left|600px](\/docs\/File:Lm75python.png)\n
\n----",
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"title": "EP-0031",
"rev_id": 10883,
"heading_path": "FAQ",
"chunk_index": 11,
"content": "*Question: I've tried to measure temperature with LM75B sensor that bought from your store, but why did i get the data that can not approach to the 0.125 resolution ?\n**Answer: Because the accuracy resolution is lower than ADC resolution,so you can not get the exactly temperature.\n*Question: why the temperature that i measured is far away from my friend's data?\n**Answer: Because different environment can cause the resolution change, for example, your system is too busy or there is a heat source nearby may cause the resolution have some offsets.\n----",
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{
"title": "EP-0031",
"rev_id": 10883,
"heading_path": "Reference",
"chunk_index": 12,
"content": "http:\/\/www.ti.com\/product\/LM75B\n----",
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