8 pressure sensors, (parameters 20g - 2.5kg) only activates at around 1kg+.

to play a sample either a wav. or in logic pro whatever is easier. (a code that tells the sample to play through a specific channel) (i'm using a multichannel usb output.)

to have a delay of around 30 seconds before another sensor is triggered to avoid multiple sensor activating at once. for the sample to play being a random one of say 20.

Hi people!
I need advice on coding the following:
8 pressure sensors, (parameters 20g - 2.5kg) only activates at around 1kg+.
to play a sample either a wav. or in logic pro whatever is easier. (a code that tells the sample to play through a specific channel) (i'm using a multichannel usb output.)
to have a delay of around 30 seconds before another sensor is triggered to avoid multiple sensor activating at once. for the sample to play being a random one of say 20.

code-advice

Are you asking specifically about coding this is Max.........can we assume that your analog-to-digital conversion is sorted?

Have you got data coming into Max, via the [serial] object perhaps?

The solution will be quite simple: for threshold triggers look at the helpfiles for [past], [maximum] and [onebang], for multichannel stuff look at the [matrix~] helpfile. You can do this entirely within Max, not sure how you would pass these triggers on to Logic tho.

I have a USB midi interface with pressure sensors hooked up to that, what kind of code would I need with this?

I have 4 sensors now, and I think I want each one to control a separate audio channel on my USB multichannel.

Thanks for the tips brendan.
I have a USB midi interface with pressure sensors hooked up to that, what kind of code would I need with this?
I have 4 sensors now, and I think I want each one to control a separate audio channel on my USB multichannel.


pressure sensors are resistors that emit a variable analog voltage - what system are you using for analog to digital conversion? What type of sensors and what type of USB interface? The system I am most familiar with is Arduino, but of course there are others, Eobody for example.

In order to use the sensors in Max, there should first be AD conversion (via some platform), then the data is accessible via the [serial] object. Your request is a simple one, we just need to know the details of your setup.

http://www.eowave.com/shop/products.php?prod=917

I have had a look at the basic commands you suggest Brendan, but it's all going over my head!

a brief glance at the brochure for the eowave suggests that your pressure sensor data should be available as MIDI data (7-bit control change) - use the [ctlin] or [midiin] objects in Max, and explore their respective helpfiles for further guidance. The [selector~], [matrix~] and [dac~] objects will give you access to your multi channel setup.

I have built all the objects, i.e dac ~ 1 2 3 4 (for the 4 channels I plan to use)

midiin with a u menu showing eobody`_core (which id the eowave interface)

but I can't work out how to make them all speak to each other, or how to load a basic audio file into max.

I tired a basic audio patch tutorial and got nowhere.

cheers Brendan.
I have built all the objects, i.e dac ~ 1 2 3 4 (for the 4 channels I plan to use)
midiin with a u menu showing eobody`_core (which id the eowave interface)
but I can't work out how to make them all speak to each other, or how to load a basic audio file into max.
I tired a basic audio patch tutorial and got nowhere.

here i a little midi setup I have, i'm trying to get it to play a .aiff file as a concept.

afaik you should send either a 1 or a 0 to [sfplay~] for start and stop; look at the helpfiles for this and the [past] object; if you just want to set a trigger threshold, use [> 120] -> [togedge]. [midiin] will not give you what you expect....use [ctlin] to identify both the controller number and value.

Hi
afaik you should send either a 1 or a 0 to [sfplay~] for start and stop; look at the helpfiles for this and the [past] object; if you just want to set a trigger threshold, use [> 120] -> [togedge]. [midiin] will not give you what you expect....use [ctlin] to identify both the controller number and value.

ok, here is where I am now but i still can't a file to play.

there are some fundamental errors in your patch:

1. [past] gets only a value as an argument, not ">120", there is a simple Max object called "greater than" [>]

2. you have connected a bang from [togedge] to the right inlet of [sfplay~] - do you know what this inlet is for and what data it expects?

3. you need a [start] or [startwindow] message to intialize your [dac~].

Here's a simple solution, but can I also respectfully suggest that you make more use of the extensive helpfiles for unfamiliar objects (rightClick on any object).

Hi
there are some fundamental errors in your patch:
1. [past] gets only a value as an argument, not ">120", there is a simple Max object called "greater than" [>]
2. you have connected a bang from [togedge] to the right inlet of [sfplay~] - do you know what this inlet is for and what data it expects?
3. you need a [start] or [startwindow] message to intialize your [dac~].

I really appreciate your help Brendan it's just I have deadline looming and it's my fault for not taking the time to learn this stuff!

(the code you typed, how do I open that in max?)

https://cycling74.com/forums/common-max-arcana

I have got a sample to trigger as the midi value rises above 124.

but every time the pressure sensor is pressed the sample resets.

Is there anyway to add a delay so it can't be re triggered again for say 30 seconds?

Also, with the ctlin object, I can't see a way of splitting the signal, my interface has 8 inputs for pressure sensors.

I am aware I have become a pain, but your advice is literally saving my project!

You're a genius!
I have got a sample to trigger as the midi value rises above 124.
but every time the pressure sensor is pressed the sample resets.
Is there anyway to add a delay so it can't be re triggered again for say 30 seconds?
Also, with the ctlin object, I can't see a way of splitting the signal, my interface has 8 inputs for pressure sensors.
I am aware I have become a pain, but your advice is literally saving my project!

OK, I found some patches and have attempted to implement a random sample attribute to the patch. I have managed to get the u menu to change but not the audio, do I need to make an additional object to actually load samples into the player?

The [prepend] object after the [umenu] will allow you to send the open message to [sfplay], so use [prepend open]

I looked at the print from the prepend open, and it appears to only play the one file stored from the open message into sfplay.

Is there any way to store multiple files into the sfplay object?

And I have looked at the delay object but thats seems to just delay a signal through the pathway, is there anyway to delay a retrigger command?

Hey Brendan, this is where I am now.
I looked at the print from the prepend open, and it appears to only play the one file stored from the open message into sfplay.
Is there any way to store multiple files into the sfplay object?
And I have looked at the delay object but thats seems to just delay a signal through the pathway, is there anyway to delay a retrigger command?

Hey, I have found a solution for the re-triggering issue with onebang.

It's not perfect though because as you can see if anyone triggers the sensor before the delay has reopened onebang, it resets the delay. Is there a better solution, or a way of making the delay only trigger once?

Hey, I have found a solution for the re-triggering issue with onebang.
It's not perfect though because as you can see if anyone triggers the sensor before the delay has reopened onebang, it resets the delay. Is there a better solution, or a way of making the delay only trigger once?

OK,I just reassigned the output of onebang from the right to the left, and that stops it reseting the delay WOAH!

why is the [prepend open] message going to a [1] message?? All this does is send a 1 to [sfplay~].

using the [print] object to debug your data flow is a GOOD THING, but you need to think more about what each object accepts as input, and how each object reacts to input - ie what it outputs.

If this is for college, who's teaching you?

If this is for college, who's teaching you?
Brendan


LOL, it's actually a uni project. i'm in year 3 and we had a few lessons, very basic in year 2, I forget most of them so i'm really in the dark, having to learn fast!

But thanks to you, I think i'm almost there!

Just no being able to work a solution, I was wondering why I kept the "1" in, but I found the patch doesn't work without it.

I can't workout how to split the ctlin, so each of the 8 sensors is routed to a different set of parameters. I looked at midiin but couldn't get it to work,

I have found, in both teaching and learning Max, that continually adding to a patch that I don't truly understand simply creates more and more errors and challenges, so........

Some patching/coding advice should help here:

Sketch out a control signal flow chart, i.e.

What should happen, when and in what order; identify each single event and its timing.

Post the signal flow chart here and I'll build you a patch.

Quit/Exit Max.
Grab pen and paper.
Sketch out a control signal flow chart, i.e.
What should happen, when and in what order; identify each single event and its timing.
Post the signal flow chart here and I'll build you a patch.

To add to the sketch, each pair of sensors I want to work together so only one can be activated at a time (what I was trying to do with the one bang delay) to stop re-triggering for an amount of time I can easily adjust using the delay object. each pair of sensors to be routed to its respective speaker (I think thats easy enough with the dac object, outputs 1 2 3 and 4 from my multichannel.) I want a way to easily add audio files into the patch (samples probably no more than a few seconds.) and I want these samples to be random from the list of stored samples in the patch. I want this duplicated for each speaker so I can load any combination of samples into any speaker and have them randomly played when activated.

(As a side note: I am having a permanent loop in the background I planned to use the looping tool in logic pro, but if there is a way to just have an audio loop in max it might be easier to have it all in one program.)

The audio loops are different on each channel so it would be a case of having an audio loop object going straight into a dac 1 2 3 4 (each dac channel having a different loop.)

I hope some of this makes sense, and again thank you so much for your advice and help, I have actually learnt a lot from using max in this sort space of time!

(As a side note: I am having a permanent loop in the background I planned to use the looping tool in logic pro, but if there is a way to just have an audio loop in max it might be easier to have it all in one program.)
The audio loops are different on each channel so it would be a case of having an audio loop object going straight into a dac 1 2 3 4 (each dac channel having a different loop.)

code advice