How do I translate a variable into HSV color values?

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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.

Accepted Answer

William Rose
William Rose on 15 Jul 2022
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.

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