LabVIEW Interface for Arduino Documents
Description
This article presents a procedure for reading the analog ports of Arduino UNO R3 board , on which a Joystick shield was installed. The analog data are related to the position of command and can be monitored from the front panel of our program , for which we use serial communication.
More information on the shield for Arduino https://www.sparkfun.com/products/9760
Procedure
First we note that the shield will work with Joystick , The position of the lever mounted on the arduino shield is calculated from the two potentiometers in the joystick . The joystick can be moved in two dimensions typically represent the X and Y. To read the potentiometers that use the analogRead () function returns a number between 0 and 1023 ( the X position is read from analog pin 0 and the Y position is read from analog pin 1) .
May be helpful to use the value of the X and Y position to determine if the joystick is centered or move to one of the 8 directions (ie , up, right , up, right, right , down, down , left, down , left, left - top) . Since we know the value of each dimension will be between 0 and 1023 could expect the central value to be around 511 or 512 , but because the joysticks are analog devices is unlikely to be accurate than the actual value. To solve this problem , we specify two values "threshold" and believe that any value within this range should be considered " center" , then the program is downloaded to the Arduino :
We will make a program in LabVIEW to test and verify the correct operation of our program in the Arduino , we will make the reading of data transmitted by the Arduino from the serial port on the card installed , proceed to read the COM port and under I received command will activate an LED for each position of the joystick, then a fragment of code
