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Questions tagged [midi]

Musical Instrument Digital Interface

0
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0answers
31 views

EMG controlled sustain pedał in MIDI keyboard for handicapped

I’m facing the following problem, which seems to be pretty easy to solve, but I’m not much experienced in this field and I’m not sure where to begin. The problem is about an adaptive device for a ...
1
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1answer
38 views

Verilog: MIDI receiver port fails when more than two keys are pressed at the same time [closed]

I'm designing a MIDI receiver port (using Altera CLPD MAX 7000S). The device samples the second byte it receives and outputs the binary value on an LEDs. The device works fine whenever I input MIDI ...
0
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2answers
78 views

Ferrite bead in cable or in device?

I am wondering, I made a MIDI circuit and was advised to use ferrite beads in my device for MIDI input/output. It is a similar to the following circuit (only the L1/L2 ferrite beads are important for ...
5
votes
1answer
948 views

How important is to have some form of electrical isolation in MIDI connectors?

I want to connect two MIDI keyboards by connecting the MIDI OUT of the first keyboard to the MIDI IN of the second keyboard, but I don't have the connector and I'm nowhere near a music store to buy ...
0
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1answer
65 views

What actually is MIDI and how does it function in a system?

Sorry for the primitive question but this is a topic where I'm completely blank and has been a mystery for me until now. I had some readings on the net but couldn't get a clear picture. All say MIDI ...
3
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2answers
137 views

how do I use H11L1 correctly to receive MIDI?

I was following this schematics. This is the first result on google images My Arduino Serial Monitor received nothing. I tried to replace the H11L1 with LED, and it does blink. but as soon as I ...
2
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2answers
97 views

Using audio instrument cable for 1MHz transmission

I'd like to transmit digital data together with an audio signal along an instrument cable. In more detail, I'd like to send MIDI data and the audio signal of a guitar on a single cable. The rationale ...
0
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1answer
57 views

Midi Timestamp Implementation

I am building a HID USB device (via Microchip PIC MCU) with a MIDI interface, which is functioning as intended (sending midi to the host). My intent is to make it usable by a DAW (such as Reaper), and ...
0
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1answer
65 views

Component that plays single .mid music file? [closed]

Is there a component, (that is not Raspberry Pi or other mini computer it would be an overkill), that I can use to play a MIDI music file on loop? Even by uploading it on it or program it to the tune. ...
0
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1answer
82 views

Effects of 200R (199R) instead of 220R in this circuit

I'm building a MIDI in circuit, and I found out my batch of 220R resistors are actually 199R... Can this cause problems/have negative effects for using in a MIDI In/Thru circuit ?
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1answer
84 views

Several MIDI over USB Device

I'm looking at creating a "specialized" MIDI over USB device for a project I'm working on and my requirements have gone beyond that of the Arduino/Pi/etc, due to limited I/O. I am very much a beginner ...
2
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2answers
176 views

Extra pins on MIDI connector?

I'm designing a MIDI project using these SDS-50J connectors. The datasheet provides a suggested footprint diagram and labels the pins 1 through 5: It does not, however, label the bottom-most two ...
0
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1answer
232 views

Is my PCB layout ok? (ATMEGA32U4, WizNet W5500, Ethernet)

I want to design a device that listens to certain network communication and calculates a MIDI clock signal out of this information. The MIDI output is via classical MIDI port or via USB MIDI. I am ...
0
votes
1answer
203 views

Best Arduino for Midi-Board

I came across this device recently: The Loupedeck. Now, most reviews say that it's built very poorly and a simple Midi controller paired with Midi2LR will get the job done better and cheaper. But, I'...
3
votes
2answers
108 views

Calculating Component Values for MIDI synth

I am reasonably new to this, and I am trying to find the calculations used to choose the component values in this circuit. Concerning the Optocoupler, from what I can work out: 6N139 Forward ...
17
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9answers
3k views

Reading a huge number of analog sensors in real time

I'm trying to build a MIDI-like controller that has a neck like a guitar. On that neck, there is a huge matrix of pressure sensors. The controller will emulate 3 strings. The way this works is: ...
0
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2answers
537 views

Why is my MCP4822 DAC not outputting 0 V?

As part of my MIDI to CV project I am using an MPC4822 (datasheet) two channel 12 bit DAC. After much toil I have everything working as planned but for the fact that even when initialised with values ...
1
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2answers
284 views

Is it possible to test a MIDI device through its connector with a multimeter?

I have a Fluke 115 multimeter available that I'm hoping has capabilities to register (even with low fidelity) any MIDI signals flowing out of a handful of devices. ...
1
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2answers
267 views

Burnt Diode in MIDI Keyboard? [closed]

A while back I think I may have plugged the wrong power adapter into my MIDI keyboard and it started to smoke and then never turned on again. So... I popped it open and it looks like it's a burnt ...
1
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1answer
427 views

Connecting MIDI patch cable DIN connector shielding and pins 1, 5

I am building myself a MIDI patch cable. According to resources such as http://www.leadsdirect.co.uk/technical-library/pinouts-wiring-diagrams/din-midi-wiring/ the middle pin of the DIN connector (pin ...
2
votes
4answers
248 views

MIDI source selector switch

So I am looking for a way to switch three signal lines between 1 source and another, the idea being I want to switch a MIDI Port on my device between thru and out modes, but also can't have any delay ...
5
votes
4answers
2k views

4N35 opto-isolator for MIDI input does not work?

I have the following circuit which I would like to use to connect a MIDI enabled device. I am not getting any signal on pin 5, could it be because the resistor from the base to ground in too small? I ...
0
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1answer
70 views

Minimum distance between inductor beads and an RF transceiver?

I there a minimum distance needed between the beads and the RF transceiver? Like below ... the connections do not really matter, just if there are requirements regarding the distance between the bead ...
0
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1answer
673 views

I cannot get opto-coupler H11L1 to work as MIDI Input

I received my H11L1 opto isolators (yeah) to use for my MIDI input(s). However, I cannot receive anything (and tried various circuits). According to the H11L1 (see datasheet) an example circuit is: ...
1
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2answers
82 views

Rh versus MHz/resistance for inductor beads

In my previous question question I learnt I have to use inductor beads, which is also according to the MIDI specs, see below They state 1K@100MHz, but if I look e.g. on AliExpress for inductor beads,...
1
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1answer
565 views

MIDI out / thru circuit questions

I made a MIDI in/out circuit, which works, however, I see I have some changes compared to some other circuits I see. In the official documentation Midi Org I see two resistors on the MIDI out circuit,...
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0answers
110 views

Creating a SPDT 'transistor' solution for MIDI

In my previous question MIDI Both as Input or Output the advice was to use a CD4053 to make a SPDT switch (multiples). However, I was thinking how it could be done with transistors. Not that I want ...
3
votes
2answers
470 views

Difference between H11L1 and H11L1M

What is the difference between a H11L1 and H11L1M opto coupler? (I want to use it for MIDI). Datasheets H11L1 H11L1M If I check the data sheets, I see some different values, but for me it is ...
3
votes
1answer
807 views

Using a MIDI connector both as MIDI In and Out (not simultaneously)

In my current (Arduino) project I have (currently) 3 MIDI INs and 2 MIDI OUTs. However, it would be nice, if I can configure each of the MIDI connectors as IN or OUT by software (Arduino). The ...
2
votes
3answers
144 views

Opening serial port for reading, when data is already flowing

I have a drummachine (Roland TR505, but all of this would be true with any other device) sending a byte 11111000 (Timing Clock MIDI message), 48 times per second, ...
1
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1answer
94 views

Midi input that doubles as gate voltage input

I'm building something that would benefit from a midi-clock input, but also a analog clock input. In order to save space, i'd like to use a mini-jack with an adapter for the midi cable (as seen in the ...
1
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2answers
926 views

Multi channel optocoupler

I'm new to electronics, so forgive not using official terms. I want to make a MIDI project with an Arduino (Mega) and want to have 3 MIDI input channels. Currently on my breadboard I use 6N137 ...
0
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1answer
33 views

Help Led matix isn't lighting up correctly Is it a Hardware or software issue? [duplicate]

I am trying to reverse engineer the project from this video: https://youtu.be/zc1zbwheyE0?t=50s. From the video a visible 10 wires are going from the LEDs to the Arduino mega, i am assuming that they ...
5
votes
2answers
717 views

Electronic component that detects angular rotation like a potentiometer, but endless and digital

I am relatively new to this whole scene but am wanting to start a small project sending midi-signals from a board I am creating. That said, I am a big fan of these endless, smooth digital ...
0
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2answers
452 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
214 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
votes
2answers
304 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
120 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 ...
2
votes
1answer
259 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
114 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
250 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
vote
1answer
427 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 ...
1
vote
2answers
504 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
votes
1answer
330 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 ...
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1answer
204 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 ...
1
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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
796 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
votes
2answers
2k 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: ...
4
votes
2answers
4k 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
votes
1answer
4k 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 ...