Issues with controlling sound using a potentiometer, suggestions PLEASE!
Im very very new to MAX so please excuse my lack of knowledge and terminology. Im currently working on a project which uses the input data from an Arduino board using different sensors to communicate with MAX via Maxuino. I have managed to patch my Potentiometer to a basic LFO in MAX using MAXUINO. I intend on eventually using other sensors but i have one hurdle to get over first.
here lies my problem, the 'analog' data from my Potentiometer gives me a range from [ 0.00 to 1 ], i can only make noise by multiply my LFO by *1000 (< like that). So, when i twist the knob on the potentiometer, at 0.00 there is no sound and then suddenly sound when it reaches the other side and goes from 0.99 to 1 there is sound. I want to make my sound increase or decrease as the Potentiometer is twisted.
Im really stuck and im a total noob when it comes to MAX, I'm just looking for any advice or suggestions that could help me with my project.
ive included a screen shot of my set up and a sketch of how the connection between the potentiometer and MAX works or how i think it should work…
I think I’ve spotted your problem.
The box that multiplies the input value reads [* 1000] – This is integer multiplication, therefore any value between 0.00 and 0.99999… will return 0; a value >=1 and <2 will give 1 and so on.
If you change the multiplication to [* 1000.] – note the decimal point- you will get floating-point multiplication and, I think, the values you’re looking for.
everybody does this from time to time :)
And in addition to Richard’s clear advice, ensure that the pot you’re using is linear: rotate the pot to approx. halfway; it should read approx. 0.5 in the Maxuino segment, if it reads significantly less than 0.5 then it may well be a logarithmic pot, where the resistivity is not linear, but exhibits a ‘jump’ at the upper limit. Or use a multimeter.
And look at the [split] object if you want to create some arc sectors.
In reply to Brendan’s post: Except that, to get linear behavior of frequency or amplitude controls you’ll actually want to use a pot with logarithmic taper (or convert linear to log inside MAX). Both pitch and loudness perception mechanisms in humans are ratiometric or logarithmic.
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