Questions tagged [midi]

Musical Instrument Digital Interface

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2answers
532 views

Read MIDI data from Akai MPK mini mkII USB MIDI controller to AVR

I have experience with AVR controllers and now I am developing analog synth like sound module. I would like to be able to connect a USB midi controller to my sound box. I would like to use an AVR ...
2
votes
1answer
325 views

Minimize current consulption for MIDI input circuit?

I'm using a MIDI input circuit like the one shown in the schematic below. R1 is not touched as driven by the input device. R2 is fed from my internal power supply. The device is very low power so I ...
2
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2answers
408 views

MIDI-activity LED

I built a simple MIDI-output circuit (as seen here: http://www.notesandvolts.com/2015/03/midi-for-arduino-build-midi-output.html). I now would like to add an LED to that circuit that should be on ...
1
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2answers
125 views

Capacitor Circuit question [duplicate]

In this MIDI-audio Patch circuit the capacitor has several lines though it - the lines look like ground lines - what do they represent ? Does one connect the up and down triangles to each other, or ...
3
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1answer
363 views

MIDI out waveforms very different between two devices

I have two MIDI output devices: an Axiom49 keyboard and a Korg SQ-1 step sequencer. The Axiom49 drives a MIDI input circuit that I've built using an Arduino just fine. The Korg SQ-1, however, does not ...
1
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0answers
164 views

Is it possible to build MIDI to relays controller?

I have MIDI keyboard (MIDI interface, not MIDI through USB) and want to make it to control 12 colored lights (LEDs probably as incandescent bulbs may not be fast enough to follow the music), one per ...
1
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0answers
312 views

Power from MIDI + level shifting

I have a circuit that draws little power (under 5mA), it accepts 2 MIDI signals and does some switching. I'm not using the standard optically isolated circuit as there is only signal manipulation done ...
1
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1answer
550 views

PIC32 UART buffer overrun in MIDI receiver application

I have a system that consists of both a MIDI transmitter and MIDI receiver, that are separate units and connected between each other with cables. A PIC32MX6xx-series microcontroller forms the heart of ...
2
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2answers
674 views

Expressiv MIDI guitar implementation

Rorguitars claim to have the best MIDI* guitar system on the market. Their website says: Our guitars do not have MIDI pickups. There is NO pitch detection to send the MIDI signals. Our instruments ...
4
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1answer
361 views

What's wrong with this simple PCB design? (midi synth)

I am designing a simple synth with Arduino (just the Atmega IC) and it works fine. The only thing is this annoying clicks I barely hear constantly if I raise the volume somewhat. I had this problem ...
-1
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1answer
252 views

MIDI Controller with an ATmega328p [closed]

Could one detect presses and releases from a 11 by 6 matrixed keyboard and send data from USART with just an ATmega328p microcontroller? I want to send MIDI notes from an old 61 key Yamaha keyboard ...
0
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2answers
1k views

5-pin DIN socket advertised as MIDI, not the same as on my MIDI gear

I bought a 180-degree 5-pin DIN chassis-mount socket dirt-cheap for a project, but I saw that it looks quite different from the MIDI outs on my MIDI gear; I did some research but couldn't find any ...
1
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1answer
1k views

ATMEGA328P send MIDI via USB

I've created a circuit on my breadboard including multiple shift registers and a teensy 2.0++. My program takes inputs from the shift regs and converts them into MIDI messages. Using my teensy in ...
2
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2answers
3k views

Use a PC123 optocoupler for MIDI input

Im trying to connect a MIDI input cable to an arduino. To do that, I need an optocoupler, that secures the internal circuits from damage. This is the schematic as shown by the MIDI specification: ...
5
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2answers
5k views

MIDI to Arduino with a 4N38 Optocoupler

I ordered a set of optocouplers the other day and was excited when they finally came in. Unfortunately, I've having a bit of trouble getting them to work. Simple on/off tasks work fine but when I ...
9
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1answer
5k views

MIDI IN : many circuits

I'm building a MIDI IN to serial port RX cicruit (for Raspberry Pi, or Arduino, or anything else...) using a 6N138 optoisolator. But I find many different circuits, I don't know why there are so ...
0
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1answer
135 views

Connecting three keytars to the NES [closed]

Let's suppose I have three keytars, such as this model. I want to hook them up to the NES (Nintendo Entertainment System) in some fashion. The NES has a controller port I can use that is wired like ...
1
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3answers
184 views

How to stretch high frequency digital signals (e.g., MIDI) into the audio range

I'm curious about the possibility of sonifying MIDI data, which has a bitrate of 31250. The range of human hearing extends to about 20kHz, which means that the fastest bits of the signal would lie ...
6
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4answers
16k views

How do I hook up an LED across the tx pin on my Atmega328?

I've built a standalone Arduino and upload sketches via this method From Arduino to a Microcontroller on a Breadboard. I would like to hook up an LED across TX like on the Arduino board, so I simply ...
3
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2answers
2k views

MIDI To Polyphonic Square Wave on Arduino

I've been struggling with this for a few days now, and I would really like to get on with my project. Unfortunately this is holding me up. What I am trying to do is retrieve MIDI signals sent over USB ...
0
votes
1answer
633 views

Plug-and-play usb-midi controller. How?

I am wondering how plug-and-play usb-midi controllers are created? To the moment I've created a simple midi controller based on Arduino Uno, but I am not able to use it directly. I have to use ...
34
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4answers
34k views

Make a custom plastic case

I have worked on many electronic DIY projects like MIDIbox (http://www.ucapps.de/), it always was fun and working but at the end, the problem was that I ended with a cool gear, but in a poor casing, ...
4
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1answer
430 views

Hardware based MIDI decoding / synthesizing

I have a lot of old MIDI equipment that was recently given to me by a retired music teacher. I have a lot of interest in it, and would like to make a MIDI synth. It does not need to be high quality or ...
1
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2answers
674 views

Serial Data Input through Microcontroller to Output Voltage

I am new here and new to programming, so I thought maybe some of you might be able to help me in the right direction. I am looking to design a circuit that receives serial data from an RS232 port on ...
-1
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1answer
303 views

Build output connector in old keyboard

I'm trying to recover an old keyboard (of about 25 years old). It has all circuitry gone in paradise, but it had a midi output and input line. Moreover, its keyboard mechanics and the transducer work ...
0
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1answer
1k views

Build output connector for Midi-USB converter in old keyboard

I'm trying to recover an old keyboard (of about 25 years old). It has all circuitry gone in paradise, but it had a midi output and input line. Moreover, its keyboard mechanics and the transducer work ...
7
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2answers
11k views

Is there any reason why using a baud rate of 31250 on an Arduino MIDI project could cause problems?

I have a 600 pulse per revolution optical encoder (and some other stuff) connected to an Arduino Uno (tried it on r2 and r3) through the interrupt pins 2 and 3. While waiting for a my MIDI jack to ...
0
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1answer
312 views

Designing a polyphonic synth [closed]

I am currently designing a synth based on various designs online and modifying them(the vco). I am not sure what I'm going to use in between the MIDI and VCO. What parts/circuits would I need to add/...
4
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2answers
8k views

Implementing a class-compliant USB MIDI device

I'm building a device that I want to communicate with a computer using MIDI over a USB connection. There are lots of USB MIDI devices that are class-compliant and thus require no special drivers, ...
0
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2answers
482 views

How would one make a MIDI to DB25 adapter?

I have a basic GamePort/MIDI cable like this: GamePort/MIDI cable http://www.turtlebeach.com/support/images/midset01.gif I was wondering if it is feasible to change this from working with a GamePort ...
0
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1answer
405 views

mbed midi controller feasibility

I'm looking to start on my first microcontroller project-- a midi controller that (hopefully) will connect to an android device via ADK as part of a touch interface. I've never worked with this lower ...
0
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3answers
5k views

Arduino MIDI interface - Serial was not declared in this scope

I'm very new to arduino, I've been trying to follow this tutorial to get the arduino to interface with the Whammy pedal using a MIDI cable. I've managed to sort out the cable, solder it, and identify ...
11
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4answers
5k views

MIDI sequencer timing accuracy using the Arduino

I build these music sequencers. Only it's not exactly a sequencer, it's a physical interface for a sequencer. The sequencer is an application that runs on a laptop that the sequencer connects to, ...
8
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1answer
1k views

Arduino serial communication protocol design

I make a drum sequencer interface for electronic music. It uses an arduino mega as it's microprocessor, and currently it interfaces to a Processing program that I wrote for serial communication. From ...
1
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1answer
90 views

MIDI status bytes

I have understood that this asyncronous protocol requires a status byte that always starts with a 1 to be able to tell what the start is of the next package and what to do with the data bytes. When ...
2
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4answers
7k views

USB-MIDI Interface with STM32F4 Discovery?

I've got an STM32F4 Discovery Board and I'd like to use/configure it as an USBMIDI device but this standard device class is not (fully) supported by the USB libraries supplied by ST. Any hint? Any ...
1
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1answer
292 views

Controlling electricity flow via MIDI to power lamps

I'm looking to build an interesting lighting rig comprised of lampshades for my band. Here's an image of what I want to achieve: I have Logic pro running in my Macbook pro. I want to create MIDI ...
2
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2answers
869 views

MIDI - clockless serial with TI MSP430 MCU software?

I'm planning to make a small MIDI transport box ( an encoder plus 6 buttons) but i don't have a lot of experience in serial communications( I have used shift registers but that's all) I would like to ...
2
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4answers
3k views

Converting old organ keyboard to MIDI

I have a very old keyboard, a CASIO MA-100 that I want to convert to a MIDI keyboard: Being a programmer and a digital electronics enthusiast, I know how to do it, but I could use some help to save ...
6
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5answers
1k views

Are these MIDI circuits equivalent?

I've been creating a MIDI Thru box project and was trying to avoid having so many resistors. Points A-G may (or may not) have a load connected to them. Are these equivalent, or do I really need to ...
4
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2answers
4k views

DIY MIDI knob Controller

What would it take for me to build something similar to the mockup below?
3
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2answers
293 views

Connector Choice for Arduino/MIDI Bridging Interface

I'm in the early stages of planning a MIDI-mapping component that I can plug into my Alesis DM-6 drum kit so I can ultimately play it through Rock Band 3. I know there are commercial options out there,...
7
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4answers
2k views

Pressure/Force sensor

One of my students are planning to make a simple musical keyboard with PIC microcontrolers, using MIDI output. The main problem now is about the pressure/force sensor. I've found a good alternative ...