Alan Joesbury

I am undertaking a large Uni project using an arduino board with various sensors, part of which I hope to use an infra red proximity sensor to detect a hand moving towards it and a pressure sensor to act as the off and on switch for a sound. The infra red sensor's job will be to determine the frequency of the sound played depending on the distance.

I have the infra red sensor working in Max giving me a range of values using the Arduino2Max patch (

http://www.arduino.cc/playground/Interfacing/MaxMSP),

 how would I go about linking these values to determine frequency?

Is it actually possible for Max to pitch a given sample or will I need to tackle this in a different way?

I haven't used Max/MSP in so long that I pretty much have to start from scratch.. this project will certainly be a learning curve for me.

Hi,
I am undertaking a large Uni project using an arduino board with various sensors, part of which I hope to use an infra red proximity sensor to detect a hand moving towards it and a pressure sensor to act as the off and on switch for a sound. The infra red sensor's job will be to determine the frequency of the sound played depending on the distance.

I have the infra red sensor working in Max giving me a range of values using the Arduino2Max patch (http://www.arduino.cc/playground/Interfacing/MaxMSP), how would I go about linking these values to determine frequency?
Is it actually possible for Max to pitch a given sample or will I need to tackle this in a different way?

I haven't used Max/MSP in so long that I pretty much have to start from scratch.. this project will certainly be a learning curve for me.
Thanks,
Alan Joesbury


using-a-range-of-values-to-change-frequency

the 10-bit values from Arduino (range sensor) might be in the range 0-1023 or thereabout; to scale this to a range of frequencies use either the [scale] or [zmap] objects, or just some simpler maths.

You need to clarify 'frequency': frequency of an oscillator ([cycle~], [saw~] etc) or loop-playback (you mention 'pitch a given sample')? If it's the latter, you might vary the value for the [sig~] object driving your file-player. Look at the helpfiles for [groove~], [sfplay~] and [play~]. Things can get a little more involved, however, if you want independent control of pitch and speed......

Hi Alan
the 10-bit values from Arduino (range sensor) might be in the range 0-1023 or thereabout; to scale this to a range of frequencies use either the [scale] or [zmap] objects, or just some simpler maths.

Thanks you for the post.
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Using a range of values to change frequency