Arduino,Xbee,Matlab project

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Mohnish Lad 2014-2-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118874-arduino-xbee-matlab-project

Hi Folks, I am trying to plot the real time graph of all the axes of the accelerometer wirelessly by XBee through MATLAB. I have achieved the following till now : On the transmitter side, I have an Arduino connected with an Xbee shield. I am using a Series 2 Xbees for this purpose. I have an ADXL335 breakout board accelerometer hooked in to the analog pins Arduino+Shield combo and also the XBee ( Co-Ordinator API) on the shield . On the receiver side, I have an XBee (Router AT) connected to a computer which will record the output and plot it on MATLAB. I also wanna mention that I am using the Arduino library for MATLAB for the Arduino code. Now when i wire up the Arduino ( i.e i dont use the Xbee) then i get a perfect output of all the axis of the accelerometer. but when i hook in the Xbee and try to communicate with the arduino i get nothing. For eg. when use the Xbee the command to plot the graph is: a = arduino(COM X) ; where X is the COM port where the Arduino is connected. Now what changes should do in the command when i connect my Xbee? Recalling again that my Arduino and accelerometer are not connected to the computer but my receiver side Xbee is.

Here is my MATLAB code:

a.pinMode(15,'input'); a.pinMode(16,'input'); a.pinMode(17,'input'); a.pinMode(18,'output'); a.pinMode(19,'output'); a.digitalWrite(18,0); a.digitalWrite(19,1); xval = zeros(); yval = zeros(); zval = zeros();

xval(1) = a.analogRead(3); yval(1) = a.analogRead(2); zval(1) = a.analogRead(2);

pause(.001);

for i = 2:1000

 xval(i) = a.analogRead(3);
 yval(i) = a.analogRead(2);
 zval(i) = a.analogRead(2);
 xmod = (xval-496)/300;
ymod = (yval-511)/300;
zmod = (zval-508)/300;
 subplot( 3,1,1)
 plot(xmod, 'r');
 axis([1 1000 -0.5 0.5]);
 title( 'x' );
 subplot( 3,1,2)
 plot(ymod, 'r');
 axis([1 1000 -0.5 0.5]);
 title( 'y' );
 subplot( 3,1,3)
 plot(zmod, 'r');
 axis([1 1000 -0.5 0.5]);
 title( 'z' );
 pause(0.001);