Raspberry Pi Temperature Logger




Here are the instructions to build a simple termperature logger using a $5.00 I2C temperature sensor.  The data is stored to the SD card and can be easily imported into excel.  Simply by changing or adding other sensors other types of data can also be collected.
Raspberry Pi Temperature Logger
The following components are used for this project:
Raspberry Pi (single board computer)
Temperature Sensor (SF-SEN-09418) 
Solderless Breadboard
Hookup Wires

The Zagros Raspberry Pi starter kit also includes everything needed for this project except the temperature sensor!

Step 1: Wire up the Temperature Sensor

Make the following connections to the Raspberry Pi GPIO port.  The ADD0 connection to ground determines the device I2C address.  More than one sensor can be connected to the I2C bus, but they must each have a unique address.

Sensor             RPi GPIO
VCC                 +3.3V

SDA                  SDA

SCL                  SCL

GND                 GND

ADD0               GND                  (note this sets the I2C device address)

ALT                 N/C

NOTE: DO NOT CONNECT THE SENSOR VCC TO +5VDC, THIS WILL DAMANGE THE SENSOR

Step 2: Enable the I2C Bus

First the I2C bus must be enabled.  By default the bus is disabled.  To do this, edit the configuration file /etc/modprobe.d/raspi-blacklist.conf

Use the command:

sudo nano /etc/modprobe.d/raspi-blacklist.conf

Now change the file contents from:

# blacklist spi and i2c by default (many users don’t need them)

blacklist spi-bcm2708
blacklist i2c-bcm2708

To this:

# blacklist spi and i2c by default (many users don’t need them)

blacklist spi-bcm2708
#blacklist i2c-bcm2708

Step 3: Set I2C Module to Load at Boot

The I2C module should be set to load when the Raspberry Pi starts up.  Do this by editing the /etc/modules file.

Raspberry Pi Temperature Logger circuit
The following command can be used to edit this file:

sudo nano /etc/modules

Add the following line to the end of the file:

i2c-dev

Step 4: Install I2C packages

Install the i2c-tools and python-smbus packages to complete the I2C setup:
 

For more detail: Raspberry Pi Temperature Logger


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