Expressive Arduino Midi Sequencer

Posted on Feb 6, 2014

This section of code outlines the main sequence of operation for the sequencer. First, a for loop is utilized to govern which step the sequencer is operating in. Within this loop, first an address is made using the assignByteToPins() function, this sends a 4 bit binary address to ensure that the input of each analog multiplexer corresponds to the

Click here to download the full size of the above Circuit.

value of k (the indexing variable of the for loop). Next, an array called "note[]` is assigned a value at position k based on the analog voltage present on pin A0, this is done in a similar fashion for the velocity[] array. Once a value is stored in each array, it is then sent to the computer through USB using the usbMIDI class and the sendNoteOn(note, velocity, channel) function. Note length and tempo are then determined using either the delay() function or the lengthWait() function to stall the operation of the program for a period of milliseconds. During operation of the sequencer, it is imperative that the desired note is played at any given time. This is accomplished by making certain that each potentiometer (the input device used to vary a note) is read at the precise time that particular note is to be played. A device known as a multiplexer is used to do this (more information on the multiplexers can be seen in the hardware section). The inputs are synced to the flow of the program by sending a 4 bit binary address to the multiplexers using the assignByteToPins function. This function takes an integer and based on its value (as long as it is between 0 and 15) will assign the corresponding binary value to the state of digital I/O pins 4 through 7. This is done by a simple if, if else ladder. While this can be accomplished more elegantly through the use of a for loop and some modulus division, it was found that writing...

Visit page

Leave Comment

characters left:

Related Circuits

Cell Phone Controlled Home Appliance circuit

Ever Imagined controlling your home appliances using your cell phone. You can find a lot of circuits for this application. But they make use of Telephone. I modified the circuit and redesigned it...

Circuit for controlling 8 appliances using TV Remote

The IR circuit can be used to switch devices using TV Remote. Normal circuits can switch only one device. But using this circuit, different devices can be controlled using same remote with...

Serial COM port using ATmega8

Many times, I have written code for UART communication and when it came to testing, my laptop does not have a serial port. I bought a USB to serial port converter but it didnt worked. I felt...

de amst wiskar: robot line folower

One of my student has made a disgraceful robot that used two stepper motors and with a simple IR sensor. Yes, above picture is what I`m talking. Without battery carrying, a little bit torque of the...

Dual cable (serial + USB) for Nikon coolpixes

To assure that USB and serial segments are electrically isolated, we used an optocoupler (U1). The LED section of U1 is driven directly by DTR, so we should select a very sensitive optocoupler to...

classic led flasher circuit

This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it`s usually the first circuit to build when starting electronic circuit building hobby....

ac-motor-control-circuits

Perhaps the most challenging aspect of interpreting ladder diagrams, for people more familiar with electronic schematic diagrams, is how electromechanical relays are represented. Compare these two...

Stamp9G20

This document was written with care, but errors cannot be excluded. Neither the company named above nor the seller assumes legal liability for mistakes, resulting operational errors or the...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Resistance-ratio detector

Applications such as photoelectric control, temperature detection and moisture sensing require a...

6V Gel Cell Battery Charger

The following diagram is the battery charger schematic for 6V Gel Cell battery type. Component...

ultrasonic transmitter 40khz

40kHZ one ultrasonic transmitter circuit, the F1 ~ F3 three oscillators in the F3 is 40kHZ square...

Condenser Microphone Amplifier Schematic using BEL 1895 IC

Here I will show you an audio amplifier circuit that can be used for walkie talkies, low power...

AIR-FILTER SENSOR FOR HOME-USED AIR CONDITIONERS

This is a design project of an air-filter sensor to be used in home heating and cooling system....

Dimming the Nixies

Fact is that the Nixies need a particular cathode current to entirely light up the cathode at...

A typical laptop power adapter circuit

A typical laptop power adapter circuit A typical laptop power adapter circuit, the AC 22V voltage...

Sequence timer circuit diagram of 555 chips

By 0.001 F the first half of the coupling capacitor 556 pairs timer output is supplied to the...

Electronic counter with automatic counting interface circuit a

Electronic calculator with automatic counting of the interface circuit shown in Figure. Figure...