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Just wondering before launching down the rabbit hole if this will work with the, say, Teensy LC: https://www.tensorflow.org/lite/microcontrollers

Actually... It really turns out it wasn't the board at all. I just reconfigured the array and it's now working fine with the existing board(s). Sheesh. Thanks again for your help.

Turns out it was a shitty board design. I got my columns and rows mixed up, therefore each were consolidated wrong at the cable ends. My very, very bad - and so sorry to have wasted your time. You guys rock.

When I convert to int in the println, it shows 36, then 38, then 40, but only if I also define the array as int. If I define the array as char and convert to int in the println, it shows 36, 44, 52, etc.

Yeah...no. Thanks for the help, guys. This appears to be a char/array def issue. I'll keep trying.

When I convert the char values to an int in the printlns and leave it char in the array def, they're separated by 4 digits so the output becomes 36, 40, 44... When I define the array as int and also convert to int in the printlns, I get the two digits spacing - 36, 38, 40... I'll keep playing...

Sorry, should have also stated that removing the single quotes results in an ASCII representation of the numbers. So, the output looks like: ON $ OFF $ ON , OFF , ON 4 OFF 4

Hardware: Teensy LC, custom pcbs (one to seat Teensy, another for reed switches) Libraries: Keypad, MIDI Output Conundrum: ON 6 OFF 6 ON 4 OFF 4 ON 2 OFF 2 Output generated by holding magnet close to reed switch. The switch wiring configuration is typical rows/columns. CODE...

Assembly Reference Tim, You simpy set a reference to it, but you must know where the assembly "lives". Darin

Thanks, Paul. Yeah, what I'm doing is pretty commonly done in the virtual pipe organ community. The difference is I'm using 8-conductor ribbon cables on both sides of the switches and I'm cutting up proto boards to mount the reed switches and diodes at the key ends. I've already purchased all of...

Well, I did bump the keypad code to 12 simultaneous keys (2 hands, 2 feet), but I'm still not able to play at those speeds. Guess I'll keep practicing. Thanks again for your help.

Yes! Thank you - that makes perfect sense to me. Was just trying to save some pin space...looks like shift registers are in my future.

defragster, I can run 2 rows x 32 columns and it will be fine. I was just wondering if anyone else had done it. This means I can run three keyboards and a pedal using 8 pins out and 8 back in. No need for shift registers or multiplexers. Thanks, Darin

I think I was asking about reducing the number of pins required on the Teensy to accommodate a switch matrix. An 8x8 requires 8, so I was thinking of reducing a 2x32 to require 2. That sort of thing. I'm using reed switches, so no power necessary. Thanks for the help. Darin

Is there any reason why an 8x8 keypad matrix cannot be collapsed to 2x32 or, heck, 1x64? Just curious what the theoretical limitations with this might be. Thanks, Darin

Use the Keypad library.

Mine also auto-pushes on verify.

So...after banging my head against the wall for a couple of days and nearly giving up in despair, I realized today that I had the column and row pin jumpers reversed on the breadboard. I plugged them in correctly and it works like a charm now. Good grief. Sometimes, I scare myself.

I'm able to compile with warnings, but my switch matrix no longer sends MIDI NoteOn or NoteOff messages. I'll get it, just need time to test serial output and then figure out why my keypad matrix is screwed up - pilot error for sure.

Errors: In file included from SingleManual_Teensy.ino:2:0: C:\Users\molnard\Documents\Arduino\libraries\Keypad/Keypad.h:82:27: error: expected class-name before '{' token class Keypad : public Key { ^ C:\Users\molnard\Documents\Arduino\libraries\Keypad/Keypad.h:92:2: error: 'Key' does not name...

Beautiful - thank you all. Sorry about not posting the error messages. I was thinking about it on the way into work today and I spend statistically 0% of my time on forums, so I'm technically quite the newbie. My apologies.

I've written code to capture switch signals from a keyboard matrix and then send them out as MIDI NoteOn/NoteOff messages. It compiles and runs fine on an UNO r3, but I can't even get a compile on the Teensy 3.1. I don't believe the code is the issue, so I'm not posting it here, though I can. I...