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Hi Nock, I'll luook for a snippet of code in my projects and try to post it here in the next few days Stefano

Yes, it would be better to reverse the button matrix diodes... For the leds (see the current implementation below) I was thinking to use something like 74HC595 or there are better choices? Thank for your great help!! Stefano

I found some time today to "study" your suggestions (You know how it happens: click one link, read that article, then follow that other link, read there, but wait what's that? search Google...e tc etc... and now it's evening...) I like the solution of the last schematic, it's neat and logic...

Today I reserved a couple of hours to read your's project documentation and to try the online editor/configurator (but I haven't any Teensy with me to connect...) It's an IMPRESSIVE work! It could become (well, it already is) the heaven for MIDI Controller makers ;-) In the next days I'll try...

Jannik and John, thank you so much for your suggestions and for all the hard work you have put in it. Now I have something to study for the next days :p ... I can dedicate only few horus a week to this hobby, I'll be back to you as soon as I have something tested Stefano p.s. ...

Thanks for your feedback! I have problems understending the above sentece, it could be my bad English or my bad electronic knowledge :o Could you elaboarate on it? Unfortunately the keyboards only have MDI OUT, not IN nor any merge function... Thank you again! Stefano

Hallo, sorry for the long post, but I'd love to have your suggestion on my next project. A premise Last year I finished my MIDI drawbars Controller based on Teensy LC and since then I used it on a numbers of gigs without any problem (for the whole project see here). I also built a bunch of...

Nice! Thanks for sharing :-) Stefano

Hi Glenn, I'm Stefano, the author of the project you found on Hackaday. :) You can find the thread about building it in this forum too: https://forum.pjrc.com/threads/37030-Drawbars-MIDI-Controller-planning-questions First of all please note that my project is built around a set of 9 linear...

Your project looks very promising and interesting, moreover considering the hight number of MIDI cntroller projectss here on the forum. I'm sure taht if you'll open source it on github you wil have lot of input and succestion, and propbably code commit too. I, for sure, will look at it as a real...

Thank you for the pictures and the explanation :-)

Very interesting! I barely understood how the led/photoresistor thing works for velocity, but looks like a brilliant idea... can you explain more about it? Thans Stefano

I get the "Multiple libraries were found for.." error all the times I compile a sketch without disabling "real time" protection in the PC's antivirus: it doesn't allows some temp file's rewriting thus the error. Maybe you too have something like that running...

[resolved] The last weekend I opened the controller and checked the circuit... and as Paul suggested it was wrong... I used the 6N139 but connected as if it was a P900 or maybe something else... So I removed the wrong paths and components, replaced with the ones suggested in the schematic at...

If it can be useful, I can provide a little Arduino sketch showing how to receive MIDI from usbMIDI, checking for the CC of your choice and using the CC value for whatever you want. Once you have that integrated in your sketch then you can performer some tests sending MIDI CC from software of...

In the meantime a re-tested the serial MIDI IN to serial MIDI OUT, connecting the OUT to a real MIDI monitor and not only to my musical expander and it proved to send out any sort of garbage too. So I can assert that is not a problem with only serial MIDI IN to usbMIDI OUT (as I wrongly said in...

Hi Paul, thank you very much for your deep analysis and suggestions! Yes, I start thinking that is an hardware issue... especially now that I ha read your posts :rolleyes: Mmmm, I built the MIDI interface months ago and I can't remember... It could be that I changed something that proved to...

wow, sounds really interesting! I wait for the second part, then! :)

Hi Pete, thanks for your feedback! Hmmm, you are right, but that code is barely a copy-paste from the MIDI_3x3 example and I presumed it works. I'm now upgrading to the latest Arduino and Teensyduino, for both I'm on the second-last version. I don't think this will change anything, but worth a...

So you would like to set say the threshold value of the noise gate (or any other paramater) not using an analog input of the teensy, but instead a value sent from the computer to the teensy via USB? Is it right? The first thing that comes to my mind is to program some sort of GUI on the...

I missed your posts at that time. Very nice instruments. Have you documented your buildings? I'm in particular interested in how do you "read" the "fake strings" strum and your usage of touch buttons. Very nice! Stefano

I second the request ;) Since it's powered by WordPress it should be just a matter of enabling it (or better: "disable disabling" ;)since I think RSS and ATOM are enabled by default on WP) Thanks! :) Stefano

The context: In my MIDI Drawbar controller based on Teensy LC I use both usbMIDI and serial MIDI (i.e MIDI IN and OUT with DIN plugs). The whole thing is configured so it can accept MIDI messages from both the IN (usb and serial), merges them with those generated by itself as a controller, then...

Wow brilliant! I have to check your code!! :) Stefano

I'm not an expert at all, but I built a number of MIDI controllers using Teensy and even Arduinos, and me too I'd be concerned to such a radical change. I'd suggest, as @JWScotSat said, to just add a simple i2c EEPROM (I'm sure that 150 unit of them will cost a lot less than the single unit on...

I missed your posts when you published them, but thanks for the description and the code too. Very inspiring (and very useful too, since I'm looking to wrap my head around OSC...) In the last years I was more on building MIDI controllers ( one and two ) for live use with hardware instruments...

Project completed! Just a quick note (I hope that I'm not breaking any forum's rule of conduct) to let all of you know that the drawbars MIDI controller (proudly named MIDI Drawbars Commander :p) is almost complete! I really want to thanks all the forum members, not only who directly...

It's really an awesome project!! I'm learning a lot reading your code. Thanks for sharing it! I'm builing a drawbars controller for my hammond clone but since it's my first Teensy project I'm an avid learner ;) STefano

[solved!] I resolved the issue... thanks to all of you! As often happens it was a stupid thing: a broken jumper... and obviously the inverted pins in the MIDI connector... Now I can go ahead with my Drawbars MIDI controller... until the next problem arises ;) Stefano

Hi Frank, well it's just an IC socket... I used Teensy mounted on it for other testing (5 analog input, some buttons etc) and it had no problem. I have to add that I checked the voltage at the end of the green wire (coming out from pin1, serial TX) and I remember I've got something around 3v...

Swapped pins but still nothing transmitted Thank you for pointing out the reversed pin error... I swapped the two pins but still nothing is transmitted :( I stripped down the script and the circuit too, to be sure that nothing interferes here. The LED blinks as expected. The Teensy is setup as...

I too had great problem finding any PC900 avaiable so resolved to buy some 6N137S... I'll try them in the next days... and if you don't mind I'll report my results here. I'm expecting that just for processing classic MIDI IN one could use it safely, maybe the problems will begin if used in a...

Hi Pete, thank you! I changed that line but still nothing happens... :( Maybe I have to "set" the USB type to something different? I tried with Serial, Midi, and Serial + Midi... but no luck :( Or maybe is a wiring problem... but really with such a simple circuit I can't see where it could be...

I'm trying to make a working Midi DIN output but after several hours checking, debugging etc... I can't get it sending anyting... so I'm asking your help to understand where I'm failing... I'm using a Teensy LC. Arduino 1.8.2. Teensyduino 1.36 the test sketch I'm using is this: #include...

A little update: I changed the schematic I posted before, now with the correct potentiometer-to-3.3V connection. I'm now looking online to find all the components, and in the meantime I'm planning with SketchUp the enclosure.

Thank you Michael!

Another little question. In my schematics I've put a 4.7k Ohm resistor between both the 2 i2c lines and 3.3v as suggested in the Wire reference page, but this post seems to suggest that 4.7k is more adeguate for 5V while for 3.3v 2.2K Ohm is better. I'm really not sure I understood that post...

OH I see! Thank you very much! I'll soon post an updated schematic so if someone else will look here he'll not be confused EDIT: schematic updated in post #20 I also attach it here

I see only now that my reply to you (posted from my cellphone) was lost. I too I'm curious to see how the hardware will come out... from my experience in previous projects the HW part is often overlooked both in terms of feasibility and in terms of costs... Now that all of you have helped me...

Well, I think I read some reference that I can't find anymore... or it's just my mis-interpretation of what A(nalog)REF(erence) is. Now re-reading the Analog Input How To I'm pretty sure that I'm wrong and have to connect directly to 3.3V I hope someone chime in with a definitive answer :rolleyes:

😀😀 Well, Thank you... I lost some precious working hours... so please don't tell it to my clients that are waiting for their website to go online 😉

Sorry for the late reply! I collected all your suggestions and I tried to draw the schematic of the whole controller, adding the MIDI IN and OUT interface too. If someone of has some free time to look at it and confirm it's ok or alert me of big errors it would be great. :) I have not added...

:) well, in any way I learned a lot !! I decided to go with the pushbuttons wired directly to 8 PINs and LEds driven via I2C. Now if someone could suggest me 2 or 3 different chip for drive the LEDs with I2c it would be great :confused: (I say 2 or 3 differnt models because I'm not sure I can...

To which PIN numbers are attached Power and Ground of the potentiometer?

Yes it would be very easy and stright-forward, but I'm planning to use each button for more than one function (using one of them like a SHIFT/ALTERNATE key) so I need them act as momentary and using the LEDS to show the actual state. I'm planning to manage the "2 state/alternate state" in the...

Thanks to all your suggestions and clarifications. I took some more time to study the links you all provided. At the same time I revised the plan for the controller. I think that I'll can go with just 9 faders, dropping the other 2 pots. Still I'm not sure if I can go with less than 9 buttons...

Thank you for your further clarification. What about making a diode matrix for the buttons to reduce the number of pin used? Or a led matrix? Does this solution could help? The Mux solution looks OK to me, and in the end also using a Teensy 3.2 will not be a problem... but since for me each new...

Ops... I forgot to mention I need to have a bunch of LED... could be 8 or 10... If I well understand LED and buttons are connected to Digital pins so to remain in the TeensyLC limit I can have max 27 of them (without using MUX etc). Is it right? Stefano

Thank you to all for your frendly answers! Wonderful, thank you! Yes, it's really my plan: to buy one of each... I have other projects in my mind... ;) For the settings in EEPROM I'll see in the future... for the first iterations I'll don't use settings at all... Ah I see... thank you for the...

Hallo, first time here, I’m Stefano from Italy. :D I’m planning the construction of a MIDI Controller and I need some help to decide if a Teensy LC is enough for my needs or if I need the Tennsy 3.2. ..and while I’m here… It would be nice to ear your comments on the whole projects feasibility...