.. module:: dlh

**********
DLH Module
**********

.. _datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF

This module contains the Zerynth driver for Amphenol DLH pressure sensors series. These calibrated and compensated sensors provide accurate, stable output over a wide temperature range. This series is intended for use with non-corrosive, non-ionic working fluids such as air, dry gases and the like.

The driver implements SPI communication.
===============
 DLH Class
===============

.. class:: DLH(spidrv, cs, d_or_g, clock=2000000)

    Creates an intance of the DLH class.

    :param spidrv: SPI Bus used '( SPI0, ... )'
    :param cs: GPIO to be used as Carrier Select
    :param d_or_g: specifies DLH type D (differential) or G (absolute) sensor. can be one of :samp:`TYPE_D` or :samp:`TYPE_G` constants
    :param clock: spi clock to be used

    Temperature and pressure values can be easily obtained from the sensor: ::

        from amphenol.dlh import dlh

        ...

        d = dlh.DLH(SPI0, D10, dlh.TYPE_D)

        press, temp = d.get_values(unit=dlh.UNIT_PASCAL)

    
.. method:: get_values(mode=MODE_SINGLE, unit=UNIT_INH20)

    Return a 2-element tuple containing current pressure and temperature values.
    The acquisition mode can be specified with one of:

    * :samp:`MODE_SINGLE`
    * :samp:`MODE_AVG2`
    * :samp:`MODE_AVG4`
    * :samp:`MODE_AVG8`
    * :samp:`MODE_AVG16`

    The unit of measure of pressure can be specified in:

    * :samp:`UNIT_INH20`
    * :samp:`UNIT_CMH20`
    * :samp:`UNIT_PASCAL`