I've made a midi controller which reads a switch and does on of two things depending on a switch:
-
send a CC midi message value 127 and switches and LED on then the next time it detects movement, it does the opposite, sending value 0, LED off
-
switches LED on and sends a midi value between 0 and 127 depending on what it senses.
I've tried to smooth the reading (it's not a huge success), since it will control a parameter on the computer and to rule out any values outside 12" of movement.
It's working, but I'd really value any thoughts about my approach and code, I'm still a relative beginner...
#include <MIDI.h>
MIDI_CREATE_DEFAULT_INSTANCE();
int current;
int ModeState = 0;
int ModeLatch = 0;
int ModeButton = 0; // variable for reading the pushbutton status
long duration;
int distance;
int variable_CC_val;
int latchedVal;
const int max_distance = 50; // ignore readings ouside this range
const int CC_num = 88; // CC for on/off
const int CC_num_2 = 89; // CC for "theremin"
const int maxi = 20; // max value for hand distance
const int midi_channel = 8;
const int LEDpin = 4 ;
const int switchPin = 5; // the number of the switch pin
const int trigPin = 3; // sensor read
const int echoPin = 2; // sensor send
const int wait = 20; // delay time
void setup() {
pinMode(9, OUTPUT);
pinMode(LEDpin, OUTPUT);
pinMode(switchPin, INPUT);
digitalWrite(switchPin, HIGH);
digitalWrite(LEDpin, LOW);
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
Serial.begin(9600); // for testing
// MIDI.begin(1); // set up midi
}
void loop()
{
ReadDistance();
ModeButton = digitalRead(switchPin);
if (ModeButton == HIGH) // latching on/off mode
{
Serial.println(ModeButton);
if (ModeState == 0 && distance > maxi)
{
ModeState = 1; // hand swipe has started
}
if (ModeState == 1 && distance < maxi) // swipe over
{
ModeState = 0;
if (ModeLatch == 1)
{
MIDI.sendControlChange(CC_num,0,midi_channel);
ModeLatch = 0;
digitalWrite(LEDpin, HIGH); // LED on
}
else
{
MIDI.sendControlChange(CC_num,127,midi_channel);
digitalWrite(LEDpin, LOW); // LED off
ModeLatch = 1;
}
} // end value low
}
else // mode 2 - continuous controller mode
{
Serial.println(ModeButton);
digitalWrite(LEDpin, HIGH); // LED on
if (distance > max_distance) // ignore anything above this range
{
distance=max_distance;
}
variable_CC_val = (distance * 4)-10;
if (variable_CC_val < 0) // ignore anything below zero
{
variable_CC_val = 0;
}
MIDI.sendControlChange(CC_num,latchedVal,midi_channel);
} // end mode 2
delay(wait);
} // end main loop
void ReadDistance()
{
digitalWrite(trigPin, LOW); // Clears the trigPin
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance= duration*0.034/2;
}