NAME

Device::Temperature::TMP102 - I2C interface to TMP102 temperature sensor using Device::SMBus

DESCRIPTION

Read temperature for a TMP102 temperature sensor over I2C.

This library correctly handles temperatures below freezing (0°C).

TROUBLESHOOTING

Refer to the documentation on Device::SMBus for information on enabling the i2c driver and finding the addresses of your i2c devices.

In the process of testing this on raspberry pi, I saw this error:

  perl: symbol lookup error: .../Device/SMBus/SMBus.so: undefined symbol: i2c_smbus_write_byte

The fix was to install the package libi2c-dev.

SEE ALSO

  https://www.sparkfun.com/products/11931

  https://www.sparkfun.com/datasheets/Sensors/Temperature/tmp102.pdf

  http://donalmorrissey.blogspot.com/2012/09/raspberry-pi-i2c-tutorial.html

  https://github.com/sparkfun/Digital_Temperature_Sensor_Breakout_-_TMP102

SOURCE

With code and comments taken from example code for the ATmega328:

  http://www.sparkfun.com/datasheets/Sensors/Temperature/tmp102.zip

  /*
    TMP Test Code
        5-31-10
    Copyright Spark Fun Electronics© 2010
    Nathan Seidle

        Example code for the TMP102 11-bit I2C temperature sensor

        You will need to connect the ADR0 pin to one of four places. This
        code assumes ADR0 is tied to VCC.  This results in an I2C address
        of 0x93 for read, and 0x92 for write.

        This code assumes regular 12 bit readings. If you want the
        extended mode for higher temperatures, the code will have to be
        modified slightly.

  */

VERSION

ATTRIBUTES

I2CDeviceAddress

Contains the I2CDevice Address for the bus on which your TMP102 is connected. The default value is 0x48.

METHODS

getTemp()

    $self->getTemp()

Returns the current temperature, in degrees Celsius.

convertTemp()

    $self->convertTemp( $reading )

Given a value read from the TMP102, convert the value to degrees Celsius.