Labview is a graphical development environment used by scientist and engineers for creating applications that interact with real-world data. With Labview you can easily design user interfaces controlled by a graphical programming language. Labview runs on Windows, Mac OSX and Linux.
This tutorial describes how you can use the dwenguino as a data acquisition board and how to control the dwenguino directly from your Labview interface. An example VI (Labview document) which demonstrates all the dwenguino functionality is included at the end of this tutorial.
You can use this VI as an easy computer interface to your dwenguino or as a starting point to create your own VI. Installation Before you can start, you need to install some software: First of all you need Labview, it isn't free software, however you can get a free license for education purposes. NI-VISA provides the necessary Labview drivers to control the serial over USB port. You also need LINX, is an open source project that provides easy-to-use VI's for interacting with embedded platforms like arduino and dwenguino. • Install Labview (2011 or higher): you can request a student license. Download the software and follow the steps to install Labview.
Vlinx ethernet serial server manual. • Install NI-VISA drivers (v 5.2 or higher): Search for, choose your operating system and install the drivers. • Install (v 2.0 or higher) using VI package manager.
Additional support to install LINX can be found in, but skip the installation of the hardware and proceed with the following steps below. • Install the arduino IDE (v 1.6 or higher) with the latest version of the dwenguino library as explained in the. • Open the arduino IDE, go to the menu Examples > Dwenguino > LabviewLinxInterface and upload this sketch (don't forget to connect the dwenguino using the USB cable, select the dwenguino platform in Tools > Board > Dwenguino and select the right serial port in Tools > Port ).
Getting Started • Download and open the with LabView. • Select the serial COM port associated with the dwenguino in the dropdown of the connection pane.
If you only connect one dwenguino to your computer, you can simply select the only COM port in the list. If there are multiple devices connected to your computer, you can check the COM port in the device manager on Windows (right click on This Computer > Manage > Device Manager > Ports (COM & LPT). Note that this is the same COM port you selected in the arduino IDE to upload the sketch. • Click the Labview run button to start the VI (first arrow icon in the toolbar at the top of your screen).
• Wait about 5 seconds until the connection to the dwenguino is initiated: When the red led in the Connection pane turns green, the connection was successfully established. From this moment you will also see the name of the connected device and the refresh rate of the interface. • To stop the current session press the stop button. This will stop the connection and release the COM port. Move further The following sections will explain in more detail the different blocks of the example VI and how to use them in your own VI.
Owning Palette: Serial VIs and Functions Requires: Base Development System Initializes the serial port specified by VISA resource name to the specified settings. Wire data to the VISA resource name input to determine the polymorphic instance to use or manually select the instance. Use the pull-down menu to select an instance of this VI. Aug 27, 2015 I can count on one hand the number of times I've had a bad serial port. Most of the time, the reason for a timeout is a bad write. You have either the wrong cable, the wrong com settings, you are sending the wrong command, or you are sending the command without the. 232Analyzer is an Advanced Serial Port Protocol Analyzer software, which allows you to control / debug, monitor / sniff serial devices (RS-232 / RS-485 / RS-422 / TTL) right from your PC. 232Analyzer is a shareware, the FREE version has some limitation but is more than enough to test and control your serial. Getting Started with LINX. In this tutorial we'll install LINX, setup a new LINX device and run our first example. Select the COM Port associated with your device and click Next. Select the Firmware Version (it's easiest to start with the Serial/USB firmware) and click Next.
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Labview Programming Tutorial
If this is your first experience with Labview: please make yourself familiar with the programming concepts of Labview. You can find a good series of starter tutorials at or take a look at the official page. Connection The structure of every dwenguino interface VI should be the same: first call the LINX initialize function to setup the connection, secondly keep doing something inside a while loop until you press the stop button or an error is generated.
At the end it is important to call the LINX close function to break the connection and release the COM port. If you forget this close function, the COM port will stay in a busy state and you won't be able to setup a new connection with Labview or with the arduino IDE anymore. The initialize function will output a linx connection object (pink wire) and an error object (brown wire). It is important you connect both of these wires to each linx function in a serial way. Each linx function will send a command through the given connection to the dwenguino and will wait for a response of the dwenguino (this takes a couple of milliseconds depending on the command). After the dwenguino responds accordingly it will pass the connection object to the next command, if not it will generate an error on the error line.
Labview Tutorial Pdf
This also explains why you shouldn't branch from the connection wire: when you try to pass the connection wire to 2 functions in parallel (at the same time), labview will also try to send 2 commands at the same time through the same serial connection as a consequence data packets will collide and an error will be generated. Read analog and digital ports You can read out any analog or digital port just like the corresponding arduino functions analogRead() and digitalRead(). You need to pass the connection and error wire to the linx command as well as a portnumber(s) to read. To readout analog ports: pass number 7 to read A7, 6 to read A6, etc. For digital pins on the expansion connector, use the numbers printed next to the pin. For other ports you need the pass the arduino digital port number, which can be found in pin mapping table in the.
In the above example we want to readout port A3 as a digital pin (note that you can use every analog pin as a digital pin, but not the other way around): in the pin mapping table you see: A3 corresponds to portnumber 27. If you want to read the pin connected to the center switch, the corresponding port number is 47. Also note in the example Interface pin 16 till 23 of the expansion connector pane are not used because these pins are multiplexed with other dwenguino functionality. Hint: you can make your own analog oscilloscope or logic analyzer with a dwenguino and the graph function on the LabviewInterface. The sampling frequency depends on the sample speed of the dwenguino, the serial connection speed and the number of other actions the dwenguino needs to do. In the example VI you can observe the current refresh rate in the right corner of the connection pane, which is about 50 - 100 Hz.
Note you can speedup the sampling frequency by removing all other interface functions: when you restrict the VI to readout 1 port, you can reach a refresh rate up to 1kHz. To visualize the current refresh rate on the front panel you can add the linx Time function somewhere inside the while loop: Write analog and digital ports You can write a value to the ports just like the corresponding arduino functions analogWrite() and digitalWrite(). Note that the arduino analogWrite() function actually puts a PWM signal on the port rather than writing an analog voltage to the port. For that reason the corresponding linx command is called 'Set Duty Cycle'.
Use the corresponding linx commands 'Set Duty Cycle' and 'Digital Write'. Pass the connection and error wire as well as the port number(s) to control. For the Set Duty Cycle command you need to pass a number between 0 and 1, which corresponds to dutycycles between 0% and 100%. For the Digital Write command you need to pass a boolean which corresponds to a low and high value. Note you can set the linx command to control a single port or multiple ports at the same time. If you write (or read) multiple ports at the same time (as in the example above), you need to pass an array of portnumbers as well as an array of values.
Python Serial Port Tutorial
Control the onboard leds Since the onboard leds are directly connected to a certain digital port of the dwenguino, you can put them on and off by the Digital Write command. In the pin mapping table of the, you can find the portnumbers that corresponds to the onboard leds: LED7-LED0 corresponds to digital port number: 39-32. Read the buttons The onboard buttons are also connected to digital ports of the dwenguino, however we can't simply use the Digital Read function here. To avoid floating pins when the buttons are not pressed, we need to configure the internal pull-up resistors before reading the port.
Labview Tutorial Ppt
Unfortunately there isn't a native linx command to do so, but linx allows us to design our own custom commands. In the dwenguino library a custom command to read out a port with the internal pull-up enabled, is already added. (More information on how to design your own custom command can be found in the last section of this tutorial) As usual you need to pass the connection and error wire to the linx Custom Command function.