How do I translate a variable into HSV color values?

I have this project where I am interfacing MATLAB with an Arduino board and reading input from an analog pin connected to a potentiometer. I want to use the voltage values read from the potentiometer to control the color of a rectangle. The voltage read is stored in the variable voltage

I have the following code:

while true
    voltage = a.readVoltage('A0');
    color = ??voltage??
    fill([0 1 1 0], [0 0 1 1], color)
    pause(0.1)
end

I would like to map the variable voltage to an HSV color value, specifically controlling the H(hue) parameter - so than when I turn my potentiometer wheel, I basically cycle through the different colors of the color wheel (ie change the hue). Is this possible? Any help is appreciated. Thanks.

Edit: the value of the voltage variable is in the range 0 - 5.

Answer 1

[William Rose]

@Shovnik Paul,

Vmax=5;
while true
    voltage = a.readVoltage('A0');
    color = hsv2rgb(voltage/Vmax,1,1);
    fill([0 1 1 0], [0 0 1 1], color);
    pause(0.1)
end

Try the above. I tested it with the following modified code, which does not require an external input. It worked as expected, generating a whole range of colors from R to Y to G to C to B to M to R.

Vmax=5;
for i=0:24
    voltage = i*Vmax/24;
    color = hsv2rgb(voltage/Vmax,1,1);
    fill([0 1 1 0], [0 0 1 1], color);
    pause(0.5)
end

Good luck.

[Shovnik Paul]

Excellent. Just what I needed. Thank you!

[William Rose]

@Shovnik Paul, you're welcome.