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rsta2 / pico

Some small programs for the Raspberry Pi Pico
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Schematics / Hardware requirements #5

Closed atulrnt closed 3 months ago

atulrnt commented 3 months ago

Hi, the Midi Adapter Flex sounds exactly like what I'm looking for (a MIDI USB interface allowing me to send MIDI message to and from my computer).

I'm just wondering what the hardware part should look like as I can't find any schematics or anything hardware related in this repo.

Thank you in advance for pointing me out the right direction!

rsta2 commented 3 months ago

I do not have a drawn schematics image, but wiring is simple, as described in the README:

serial interface via GP0 (UART0 TX)/GP1 (RX) and/or GP4 (UART1 TX)/GP5 (RX)

...

The Raspberry Pi Pico is powered via USB, the VSYS or VBUS pins must NOT be connected!

You also have to connect the ground for each serial interface.

atulrnt commented 3 months ago

Thanks for answering so quickly!

In that case, should I connect the MIDI female connector directly to the UART pins? No optocoupler, resistors or anything like that?

rsta2 commented 3 months ago

What do you want to connect? On one side there is the computer via USB. What is on the other side? If it is a keyboard with a normal DIN serial MIDI jack, it is right, you need a small circuit with an optocoupler. Unfortunately I do not have it by hand. Perhaps you can find it on the Internet.

rsta2 commented 3 months ago

Perhaps the circuit in this article can help you. It describes a MIDI interface for the Raspberry Pi Zero, but the two parts of the circuit for MIDI IN and OUT should re-usable for the Raspberry Pi Pico. Please note that the pins of the Pico can only handle 3.3V levels not 5V.

For explanation: I used the Pico with my software only to connect a Raspberry Pi SBC to a PC. In this case a converter circuit is not necessary. Also I'm a software developer, hardware is not my business.

atulrnt commented 3 months ago

Thank you, this exactly what I needed!