In this example we connect a DS18b20 temperature sensor to our Raspberry PI and read in the value, here is the schematic for this.
Start the terminal and entering the following
sudo modprobe w1-gpio sudo modprobe w1-therm cd /sys/bus/w1/devices ls cd 28-xxxxxxxxxx (change this to match the serial number that pops up) cat w1_slave
You should see something like this
In the output above the t=18875 is the temperature, in this case this is equal to 18.875
Now we will try this in python
Open the terminal and type in the following
Wait for IDLE to open, then click File > New to open a new window. Or you can use CTRL + N.
Now type in the following code
import time while 1: tempfile = open("/sys/bus/w1/devices/28-0000027a4334/w1_slave") temptext = tempfile.read(); tempfile.close() tempdata = temptext.split("\n").split(" ") temperature = float(tempdata[2:]) temperature = temperature / 1000 print temperature time.sleep(1)
Click File > Save when you are finished (Ctrl + S).
To run your program, click Run > Run (Ctrl + F5), your should output like the following