To install and use the TMP006 Python library follow the steps below.
Before you get started make sure your board is connected to the internet through an ethernet or wireless connection so you can download dependencies.
You'll also want to be familiar with connecting to a Raspberry Pi or BeagleBone Black terminal with SSH.
Dependencies
First install dependencies by executing in a terminal:
sudo apt-get update sudo apt-get install build-essential python-dev python-pip python-smbus git
You can ignore warnings about dependencies which are already installed.
Raspberry Pi
On a Raspberry Pi execute the following to make sure the RPi.GPIO library is installed:
sudo pip install RPi.GPIO
BeagleBone Black
On a BeagleBone Black execute the following to make sure the Adafruit_BBIO library is installed:
sudo pip install Adafruit_BBIO
Library Install
Next download the TMP006 Python library to your home directory and install it by executing:
cd ~ git clone https://github.com/adafruit/Adafruit_Python_TMP.git cd Adafruit_Python_TMP sudo python setup.py install
That's all you need to do to install the Python library!
Usage
To learn how to use the TMP006 Python library you can run and review an example program included with the library. To run the example navigate to the examples directory and run the simpletest.py script by executing:
cd examples sudo python simpletest.py
If everything goes well you should see the sensor's object and die temperature displayed every second:
Press Ctrl-C to quit. Object temperature: 25.368*C / 77.662*F Die temperature: 23.094*C / 73.569*F Object temperature: 25.368*C / 77.662*F Die temperature: 23.094*C / 73.569*F Object temperature: 26.763*C / 80.174*F Die temperature: 23.094*C / 73.569*F ...
If you see an error make sure you're running the program as root with the sudo command, and that the dependencies & library were installed successfully.
To understand the usage, open simpletest.py in a text editor and follow along with the description of the code below.
import Adafruit_TMP.TMP006 as TMP006
First the TMP006 module is imported with a Python import statement.
# Default constructor will use the default I2C address (0x40) and pick a default I2C bus. # # For the Raspberry Pi this means you should hook up to the only exposed I2C bus # from the main GPIO header and the library will figure out the bus number based # on the Pi's revision. # # For the Beaglebone Black the library will assume bus 1 by default, which is # exposed with SCL = P9_19 and SDA = P9_20. sensor = TMP006.TMP006() # Optionally you can override the address and/or bus number: #sensor = TMP006.TMP006(address=0x42, busnum=2)
Next an instance of the TMP006 class is created.
Notice that if nothing is passed in to the initializer function the library will pick a default I2C device address (0x40) and bus number. If you need to specify the I2C address or bus number you can do so by specifying them as optional parameters in the TMP006 initializer.
# Initialize communication with the sensor, using the default 16 samples per conversion. # This is the best accuracy but a little slower at reacting to changes. sensor.begin() # Optionally initialize with a faster but less precise sample rate. You can use # any value from TMP006_CFG_1SAMPLE, TMP006_CFG_2SAMPLE, TMP006_CFG_4SAMPLE, # TMP006_CFG_8SAMPLE, or TMP006_CFG_16SAMPLE for the sample rate. #sensor.begin(samplerate=TMP006.CFG_1SAMPLE)
After creating the TMP006 class instance the begin() function is called to initialize communication with the device.
Notice that you can specify an optional samplerate parameter which specifies how many samples will be taken to form a temperature reading. The more samples used the more accurate your reading, however there will be a trade-off in the speed of measurements.
# Loop printing measurements every second.
print 'Press Ctrl-C to quit.'
while True:
obj_temp = sensor.readObjTempC()
die_temp = sensor.readDieTempC()
print 'Object temperature: {0:0.3F}*C / {1:0.3F}*F'.format(obj_temp, c_to_f(obj_temp))
print ' Die temperature: {0:0.3F}*C / {1:0.3F}*F'.format(die_temp, c_to_f(die_temp))
time.sleep(1.0)
Finally the example enters a loop where it reads temperature measurements and prints them out every second. The important thing to see are the two temperature measurement functions, readObjTempC() and readDieTempC().
The readObjTempC() function will read the object temperature and return its value in Celsius. Make sure to skim the TMP006 user guide to understand how the TMP006 chip measures object temperature.
The readDieTempC() function will read the TMP006 die temperature and return its value in Celsius. Note that this value is the temperature of the chip's die and not the temperature of the object.
That's all there is to use the TMP006 Python library! If you run into issues or wish to contribute, feel free to followup on the library's Github page.
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