Labview Postgresql Connectivity

By Robert Emin

Data Flow

Sensor ---> 16 Gauge WireData Acquisition Device ---> USB

Windows ComputerLabview

APITCP/IP ---> Ethernet

Linux ServerPostgresql

Allegro 1301 Hall Effect Sensor

Used to measure the presence of a magnetic field.

Hall Effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications. They are used for electronic compasses, clamp-on sensor, analog multiplication, current sensing, position and motion sensing, automotive ignition and fuel injection, wheel rotation sensing, industrial applications, spacecraft propulsion and as many as there is creativity.

4.5 to 6 V input

Ground

2.5 V output

National Instruments 6211

Voltage Measurement -10V to +10V

Analog InputAnalog OutputDigital InputDigital OutputCounterUSB

Microsoft Windows 7

Most stable version of Windows operating system. Most supported by National Instruments. Ideal for running real time applications under the Microsoft line of products.

National Instruments Labview

Most popular product in engineering for data acquisition and control development. It is a visual development environment Versions for Mac, Linux and Windows. Its programs and functions are known as VI's. Has been around since 1983 and dominates the industry. On Windows, it is an open architecture allowing to directly interface with dll's, activex, .net and other Windows products.

Postgresql2Labview

A collection of Labview VI's built from dll's belonging to the Postgresql library libpq. This allows Labview to directly communicate with Postgresql. Has speed and reliability advantages over other products.

Linux

This system uses Debian Linux. Free. Stable. Secure. Can view the source code. Tools for making true real time systems.

Postgresql

Open source. Free. True RDMS and object orientated. Robust. Secure. Can see the source code.

Table Structure

CREATE TABLE "public"."work_voltage" ( "voltage" DOUBLE PRECISION NOT NULL, "date" DATE DEFAULT 'now'::text::date, "time" TIME WITHOUT TIME ZONE DEFAULT 'now'::text::time without time zone, "identifier" BIGSERIAL, CONSTRAINT "work_voltage_pkey" PRIMARY KEY("identifier"));

Courtesy of Lloyd Albin

Labview Call Library Function

Interfacing with the dll

Any Questions???