How to display temparature, pressure and altitude of the BMP 280 using Arduino (uno) on Matlab?

I have been using the code:

a=serial('COM3','BaudRate',9600);

%create the coordinate axis

plotTitle='Test';

xLabel = 'Elapsed Time (s)'; % x-axis label

yLabel = 'Temperature (C)';

legend1='Temperature';

legend2='Pressure';

legend3='alitude';

yMax=40 ;

yMin=0;

min = 0;

max = 40;

delay=.01;

%function variables

time=0;

data1=0;

data2=0;

data3=0;

count=0;

%plot set up

plotGraph=plot(time,data1,'-r' );

hold on

plotGraph1=plot(time,data2,'-b')

plotGraph2=plot(time, data3,'-g' )

title(plotTitle,'FontSize',15);

xlabel(xLabel,'FontSize',15);

ylabel(yLabel,'FontSize',15);

plotGrid = 'on';

legend(legend1,legend2,legend3);

axis([yMin yMax min max]);

grid(plotGrid);

tic

%loop

while ishandle(plotGraph) %when plot is active will run until plot is closed

dat1=readTemperature();%unkown pin

dat2=pressure;%unkown pin

dat3=altitude;%unkown pin

count=count+1;

time(count)=toc;

data1(count)=dat(1);

data2(count)=dat(2);

data3(count)=dat(3);

set(plotGraph,'XData',time,'YData',data);

set(plotGraph1,'XData',time,'YData',data1);

set(plotGraph2,'XData',time,'YData',data2);

axis([0 time(count) min max]);

%Update the graph

pause(delay);

end

delete(a);

BUT I get an error:

"Error in try2 (line 35)

dat1=readTemperature();%unkown pin"

I dont know if we have to use simulink or if we must run Arduino software at the same time.

Please help me.

Thank you.

Answer 1

[Vimal Rathod]

Hi,

You have to establish an I2C channel connection after connecting the arduino and the required parameters like temperature, pressure and altitude should be read and write in that channel itself.

Refer to the following link which describes the example for temperature reading from arduino. You can modify your code appropriately to suit your needs.

https://www.mathworks.com/help/supportpkg/arduinoio/examples/measure-temperature-from-i2c-device-on-arduino-hardware.html