Hello all,
a little background, I am trying to build a midi percussion instrument useing piezo sensors [that expands upon Todbot's mididrumkit Index of /arduino/sketches/midi_drum_kit by employing the Fluidforms Cassius punching bag's Arduino Playground - HomePage code, another geat project that was very helpfull is the midifootstep MIDI Footsteps and less I forget my homies at ITP Physical Computing http://itp.nyu.edu/physcomp/]. In my draft below sensorID *are notes middle C and up one and one half octaves, where value [j] is the velocity byte i.e. the last byte of the 'note on'/'note off' command to be sent. I haven't tested the sketch yet. I could really use a little guidance as the syntax is still very new to me. I may have overlooked or left something out so if I've made an error or you see a way I can build/optimise a working sketch your insight would be greatly appreciated. *
```
/ ReadMultiplexedSensorsAndSendMIDI
*
- Reads 2 8 channel Multiplexers and sends midi note and velocity values
*/
#define CONTROLpin1 2
#define CONTROLpin2 3
#define CONTROLpin3 4
#define PIEZOTHRESHOLD 100
#define mux1 0
#define mux2 1
#define drumchan 1
// Variables:
char sensorValueToSend = 0; // Value of the sensor
int actualSensorValue = 0; // value from the analog input
int val,t;
char sensorID[16] = { 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74};// middle C = 60
//int currentState[60]; // current state of sensors
//int lastState[60]; // the last state of the sensors
// Some error chacking would be good here.
//If the values exceede 128 the will not fit in one byte.
// Send a MIDI note-on message. Like pressing a piano key
void noteOn(byte channel, byte sonsorID, byte value) {
midiMsg( (0x90 | channel), sensorID, value);
}
// Send a MIDI note-off message. Like releasing a piano key
void noteOff(byte channel, byte sensorID, byte value) {
midiMsg( (0x80 | channel), note, velocity);
}
// Send a general MIDI message
void midiMsg(byte cmd, byte data1, byte data2) {
digitalWrite(ledPin,HIGH); // indicate we're sending MIDI data
Serial.print(cmd, BYTE);
Serial.print(data1, BYTE);
Serial.print(data2, BYTE);
digitalWrite(ledPin,LOW);
}
void setup() {
// set the states of the I/O pins:
pinMode(LEDpin, OUTPUT);
pinMode(CONTROLpin3, OUTPUT);
pinMode(CONTROLpin2, OUTPUT);
pinMode(CONTROLpin1, OUTPUT);
begin.Serial(31250);
}
void loop() {
int i;
int j;
for (i=0; i <8; i++) {
// set control pins on the multiplexers
digitalWrite(CONTROLpin3, (i&4)>>2);//bit3
digitalWrite(CONTROLpin2, (i&2)>>1);//bit2
digitalWrite(CONTROLpin1, (i&1) );//bit1
// read the analogue inputs and send the values of the sensors.
for(j=0; j<2; j++){
val = analogRead(mux1); // the "#define mux1" type statements are ok for mapping Mux to analog port
// Serial.print(mux1); //use the result << only need for debug
if( val >= PIEZOTHRESHOLD ) {
t=0;
// this while mini-loop reads over & over waiting for the signal to die down?
// keep conversion time in mind again
while(analogRead(mux1) >= PIEZOTHRESHOLD/2) {
t++;
}
noteOn(0x90 | channel,note, t2); // replace note with array[i,j]
delay(t);
noteOff(0x80 | channel,note,0);
}
val = analogRead(mux2);
// Serial.print(mux2); //use the result << only need for debug
if( val >= PIEZOTHRESHOLD ) {
t=0;
// this while mini-loop reads over & over waiting for the signal to die down?
// keep conversion time in mind again
while(analogRead(mux2) >= PIEZOTHRESHOLD/2) {
t++;
}
noteOn(0x90 | channel,note, t2); // replace note with array[i,j]
delay(t);
noteOff(0x80 | channel,note,0);
}
}
// if you uncomment this line you can check the control pins
// of the multiplexers with your multimeter.
//delay(500);
}
}*
```
Am I on the right track here, and can anyone help with
> // replace note with array[i,j]
==========
=============
http://seanhannity.com
http://barakobama2011.com
Loved hearing from the Arduino people on The Flossweekly podcast on the TWiT network Arduino
===========
Thank you in advance
Caesar