Control Color of Lamp on Instrument Panel by Using MATLAB®

This example shows how to control the color of a lamp indicator on an instrument panel that connects to a Simulink® Real-Time™ application.

The example operations are:

• Create uifigure, add lamps, and add labels

• Open model and build real-time application

• Connect lamps and add instrument

• Observe color cycle of lamps

• Remove instrument

• Close model

Create uifigure and Add Components

f = uifigure;
lamp1 = uilamp(f);
lamp1.Position = [10 300 20 20];
tlabel1 = uilabel(f);
tlabel1.Position = [40 298 100 22];
tlabel1.Text = 'Lamp 1';
lamp2 = uilamp(f);
lamp2.Position = [10 200 20 20];
tlabel2 = uilabel(f);
tlabel2.Position = [40 198 100 22];
tlabel2.Text = 'Lamp 2';

Create Target Object and Connect

Create a Target object for the default target computer and connect to the target computer.

tg = slrealtime;
connect(tg);

Build Real-Time Application

model = 'slrt_ex_lamp_instrument';
open_system(model);
modelSTF = getSTFName(tg);
set_param(model,"SystemTargetFile",modelSTF)
set_param(model,'FixedStep','.01');
evalc('slbuild(model)');

Run Real-Time Application

load(tg,model);
start(tg);

Wait for Application Start on Target Computer

pause(2);

Add Instruments to UI Figure

inst = slrealtime.Instrument;
inst.connectScalar(lamp1, 'lamp1', 'PropertyName', 'Color', 'Callback', @setLampColor);
inst.connectScalar(lamp2, 'lamp2', 'PropertyName', 'Color');
addInstrument(tg,inst);

Wait and Observe Lamp Color Changes

pause(10);

Stop Real-Time Application

stop(tg);

Remove Instruments

removeInstrument(tg,inst);

Close Model

bdclose(model);

Callback for changing Lamp Color

function color = setLampColor(~,d)
    switch uint8(d(end))
        case 5
            color = 'green';
        case 4
            color = 'yellow';
        case 3
            color = 'cyan';
        case 2
            color = 'magenta';
        case 1
            color = 'red';
        otherwise
            color = 'white';
    end
end