Matteo

I'm currently programming a synth in max, and my project is to create an analog interface for a musical use. I want to build a control panel with faders and potentiometers. Each deliver analog tension, and i want to use this tension (convert in digital values) in max. I've already realised a project with sensors and max using arduino, but for this project, I need a lot of analog inputs in my acquisition card. According to my research, arduino can provide a maximum of 16 analog inputs.

Do you know of any device which works with Max and have a lot of analog input ?

I'm currently programming a synth in max, and my project is to create an analog interface for a musical use. I want to build a control panel with faders and potentiometers. Each deliver analog tension, and i want to use this tension (convert in digital values) in max. I've already realised a project with sensors and max using arduino, but for this project, I need a lot of analog inputs in my acquisition card. According to my research, arduino can provide a maximum of 16 analog inputs. 

Hello,
I'm currently programming a synth in max, and my project is to create an analog interface for a musical use. I want to build a contro

multi-sensors-acquisition

I'm guessing you are using the Mega2560 board by Arduino. If you want to stick with Arduino, then you will have to use "multiplexing", which requires a fairly simple addition to your circuits:

http://playground.arduino.cc/Learning/4051

http://garagelab.com/profiles/blogs/tutorial-4051-mux-demux-with-arduino

Although the concept is pretty simple - 8 analog inputs sent to 1 amalog input and chronologically polled very quickly - I've never used it myself

Do a bit of Googling to see if other boards offer more than 16 analog inputs

Note that the analog-digital converters do need time: your response time will be divided by 8 if you multiplex 8 sensors to one analog input. Which might be perfectly fine depending on what you do with your sensors, of course.

Yes, this might be a great solution, but I'd like to use sensors simultaneously, and multiplexing can only use one of the 8 inputs at a time. So I keep looking after Max-friendly boards with a maximum analog inputs.

Yes, this might be a great solution, but I'd like to use sensors simultaneously, and multiplexing can only use one of the 8 inputs at a time.  So I keep looking after Max-friendly boards with a maximum analog inputs.

"I'd like to use sensors simultaneously, and multiplexing can only use one of the 8 inputs at a time"

As I say, I haven't used this exact method before so I can't give you real-world millisecond data, but the analog inputs on the 4051 are polled very *very* quickly, within a for-loop running on the microcontroller. I used a somewhat similar method in my own DMI designs (with 16 FSRs) and there was absolutely no noticeable latency.

Faders and pots are comparatively archaic mechanical artefacts and as such are not incredibly dynamic; will many people be using the controller you are planning? You only have two hands ;)

Yes you're right I only have two hands ;)

But if i modulate tow faders silmutaneously, wich are pluged one the same 4051, How Max can route the right fader to the right slider (in my patch) ? Because both tensions are sent throught one analog input of the microcontroller.

Well, let's say you have 12 faders (F1 - F12) and 12 pots (P1 - P12). You could design your circuit such that odd numbered faders go to one multiplexer, and even numbered faders to another. Then your pots could go to the remaining individual analog inputs. Try searching the forum here for "multiplexer", "4051" etc. If you are building a CONTROLLER, as opposed to an INSTRUMENT, then I really don't believe that using multiple faders/pots will be an issue.

Well, let's say you have 12 faders (F1 - F12) and 12 pots (P1 - P12). You could design your circuit such that odd numbered faders go to one multiplexer, and even numbered faders to another. Then your  pots could go to the remaining individual analog inputs. Try searching the forum here for "multiplexer", "4051" etc. If you are building a CONTROLLER, as opposed to an INSTRUMENT, then I really don't believe that using multiple faders/pots will be an issue.

. . . how many faders and pots are you hoping for?

Multi-sensors acquisition