To implement Water level control using LabVIEW and analog input signals from sensors

Mar 17, 20171 like567 views

1) The document describes an experiment to control water level using LabVIEW and sensors by interfacing an Arduino board with a relay switch. 2) LabVIEW is a graphical programming environment used to develop the water level control program. It uses a dataflow model instead of text-based code. 3) A relay is an electrically operated switch that uses an electromagnet to mechanically operate the switch contacts. Relays are used to control circuits using low-power signals or to control multiple circuits with one signal.

EXPERIMENT – 7
OBJECTIVE: To implement Water level control using LabVIEW and analog input signals from
sensors.
APPARATUS USED: Arduino board, Relay switch, LABVIEW setup.
THEORY:
Introduction to LABVIEW: LabVIEW is an integrated development environment designed
specifically for engineers and scientists. Native to LabVIEW is a graphical programming
language (G) that uses a dataflow model instead of sequential lines of text code, empowering you
to write functional code using a visual layout that resembles your thought process. This means
you spend less time worrying about semicolons and syntax and more time solving the problems
that matter.
Relay Switch: A relay is an electrically operated switch. Many relays use an electromagnet to
mechanically operate a switch, but other operating principles are also used, such as solid-state
relays. Relays are used where it is necessary to control a circuit by a separate low-power signal,
or where several circuits must be controlled by one signal. The first relays were used in long
distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and
re-transmitted it on another circuit.
 The input circuit is switched off and no current flows through it until something (either a
sensor or a switch closing) turns it on. The output circuit is also switched off.
 When a small current flows in the input circuit, it activates the electromagnet, which
produces a magnetic field all around it.
 The energized electromagnet pulls the metal bar in the output circuit toward it, closing the
switch and allowing a much bigger current to flow through the output circuit.
 The output circuit operates a high-current appliance such as a lamp or an electric motor.

Connection of relay through BJT:
In the above figure shown a connection of relay with a BJT, in this system BJT is working as a
switch. When the high signal is read by it or it closes the switch relay coil get magnetize and
move it pin to NO. This connection completes the circuit and relay will off the AC switch which
controls the motor operations.
Interfacing Relay with Arduino:
In this circuit, the pins of seven-segment display are connected to Arduino pins 2-9, as shown in
the table below. Common pins (pin 3 and pin 8) are connected to GND and dp is left
unconnected, because it is not used in this experiment
U
N
O

Interface Arduino through LabVIEW:
Checks if LabVIEW sent a new value. If there is a new value, it converts it into integer byte with
the same value. This integer byte represents the delay interval used in sequence. That, the greater
the delay the lower the speed and vice versa. Else, Arduino continue running the motor at current
speed. This prevents the processor from overloading the serial port and pushes it to avoid
Arduino Serial port hanging.
RESULT: Study the operation of water level control with LabVIEW and close switch for tank.

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The document describes an experiment using LabVIEW to study and design the implementation of flexible joints (CDEx). It discusses using LabVIEW, a visual programming platform, to create a virtual instrument (VI) with a block diagram and front panel to control a rotary flexible joint model. The VI uses state feedback control to move the joint from one setpoint to another by changing weights in an LQR matrix to generate a desired dynamic response. Results show the flexible joint model being controlled by the servo motor voltage VI to vary parameters like deflection angle and moment of inertia. Precautions are given to avoid locking the user interface.

Design the implementation of Brushless DC Motor Six Step Control.Ankita Tiwari

This document summarizes an experiment using LabVIEW to implement six-step control of a brushless DC motor. LabVIEW is a visual programming language where programs are created by connecting functional nodes with wires to pass data. The experiment uses LabVIEW to control a brushless DC motor and read sensor data from hall sensors to implement six-step motor control. A main VI calls various sub-VIs to control the motor, read LIDAR sensor data, perform obstacle avoidance calculations, and apply wheel velocities to move the robot. Precautions are noted to avoid locking the user interface.

Design the implementation of 1D Kalman Filter Encoder and Accelerometer.Ankita Tiwari

1) The document describes an experiment using LabVIEW to implement a 1D Kalman filter encoder and accelerometer on a robot. LabVIEW is a visual programming language that uses graphical programming techniques instead of text. 2) The experiment uses various LabVIEW VIs (virtual instruments) including ones for reading simulated LIDAR sensor data, applying a vector field histogram algorithm to identify obstacles, and applying velocity controls to move the robot. 3) Precautions are noted such as configuring all events in a single event structure to avoid locking up the user interface.

Design the implementation of NMEA Get GPS Data from RecordAnkita Tiwari

The document describes an experiment using LabVIEW to get GPS data from an NMEA file. It discusses LabVIEW as a visual programming environment and how it was used to create a main VI and sub-VI to read NMEA sentences from a file, parse the GPS data, and plot the latest location and heading. The VI opens the text file, reads 400 characters at a time which may include multiple sentences, parses complete sentences into a data cluster, returns the most recent value if there are multiple in a reading, and passes any remaining partial sentence to the next iteration after closing the file.

design the implementation of trajectory path of the robot using parallel loopAnkita Tiwari

This document summarizes an experiment using LabVIEW to implement the trajectory path of a robot using a parallel loop algorithm. It uses LabVIEW to create a control loop with sub-VIs for steering, reading LIDAR sensor data, vector field histogram analysis, and applying velocity to wheels. The experiment executes timed loops to process sensor data and control the robot at 10 Hz while avoiding obstacles identified by the vector field histogram analysis.

Design the implementation of trajectory path of the robot using parallel loop...Ankita Tiwari

The document describes an experiment to implement the trajectory path of a robot using parallel loop algorithms in LabVIEW. It uses three main loops: 1) a mission planning loop that establishes goals, 2) a path planning loop that computes a path to the goal, and 3) a navigation loop that drives the robot along the path. Various sub-VIs are created to initialize maps and variables, create the robot, draw maps, and steer the robot. The experiment results in implementing robot trajectory paths using parallel loops to coordinate mission planning, path finding, and navigation.

Sleep paralysisAnkita Tiwari