get midi from another board (esp or arduino)

[fjgaston]

Hi,
I don't know to much about midi signal but is there an easy way to send midi notes from an esp or arduino to the "esp32 midi sampler" ?
By the way, I'm trying to make it work with lyraT board, with 8388 codec, do you think of anything that could be wrong with this board ?

[souravlal]

Hi, you can use an Arduino to send midi messages. https://www.digikey.com/en/maker/projects/agm-summer-break-edition-raspberry-pi-midi-controller-synthesizer/45f94d1c75644494aaf7dda60e9b8693
Above is a good tutorial how to send midi signals using Arduino with button matrix. It uses an Arduino pro micro to send USB midi messages, however if you want to send serial midi in case for controlling ESP32 Audio-kit you can use the same code and circuit and just connect TX pin of the Arduino to send midi messages to ESP32 Audio-kit, in this case you can use any Arduino( nano, uno, etc...)

But if you don't want to use button matrix, you can use Arduino IO pins directly and if you want to extend the number of pins you can use multiplexers. Use this tutorial if you want to do this:-
https://www.notesandvolts.com/2016/07/arduino-midi-controller-multiplexers.html?m=1
In this project only Arduino Uno will work (Atmega328p IC will also work) if you are using multiple number of multiplexers.

You can use any optocoupler for Isolation, I would recommend digital optocouplers like 6N137 or H11L1 which doesn't miss out on any MIDI events.

[marcel-licence]

add this: extern uint32_t sampleRecordCount; at the top of the file. I will commit the update

[fjgaston]

awesome it works now !

[souravlal]

The bin file is optional. It will be generated when saving a sample. It stores the loop information and adsr settings. If you load a wav without bin the sample will be played without loop as one shot sample. You can also use the statements shown in my last video if you know the loop points by for example using audacity.

If you have an IO free you could also use this as an analog input to use one input for multiple buttons if you have some restors left

@marcel-licence How can I save a sample? where will it be stored? Can I save a sample which I load from SD Card?

[marcel-licence]

Please look into z_config.ino. There is a function Sampler_SavePatch mapped to save your current settings -> wav and ino will be created

[souravlal]

@marcel-licence Where will it be saved? I mean which location?
Can it be done using buttons and display?