hold last sensor value

Using Arduino Programming Questions
14

I was wondering about that. How fast a hardware pulldown occurs VS how fast the arduino loops. But it behaves ok. So if it isn't broken don't fix it, right?

Now that that works I need to figure out how to release it so that I can slide my finger over the ribbon triggering notes form a scale.

I am currently blocking the polling of the sensor by how I wrote my code so the value does not update and the note won't change. Can you point me in the right direction please?

#include <MIDI.h>

int posPin = A0;
int posVal = 0;
int note = 0;
int tempVal = 0;
int led = 13;
int scale[] = {
  60,62,64,65,67,69,71};

#define LED 13

void setup() {
  pinMode(LED, OUTPUT);
  MIDI.begin();            	// Launch MIDI with default options
}

void loop(){
  readPos();
}

void readPos(){
  tempVal = analogRead(posPin);

  if(tempVal == 0) {
    MIDI.sendControlChange(123,0,1); // OMNI NOTE OFF MSG
    digitalWrite(led, LOW);
  }

  if(tempVal !=0) {
    posVal = tempVal;
    posVal = map(posVal, 1023, 1, 127, 0); // make midi notes
    posVal = constrain(posVal, 0, 127); // constrain it
    note = map(tempVal, 1023, 1, 6, 0); // make it 7 for the note array
    note = constrain(note, 0, 6); // constrain it
    note = scale[note]; // pick a note
    MIDI.sendNoteOn(note,127,1); // send the note (note, velocity, channel)
    digitalWrite(led, HIGH);
  }
}