alcoholLevelInspector.ino

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
  #define PSTR
#endif

#define PIN 6

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(5, 5, PIN,
  NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
  NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE,
  NEO_GRB            + NEO_KHZ800);

int beepPin = 7;
int ethanolPin = A0;
int potPin = A3;

void setup() {
  matrix.begin();
  matrix.setBrightness(15);

  pinMode(ethanolPin, INPUT);
  pinMode(potPin, INPUT);
  pinMode(beepPin, OUTPUT);
}

void loop() {
  int ethanolVal = analogRead(ethanolPin);
  int potVal = analogRead(potPin);
  int threshold = map(potVal, 0, 1023, 300, 550);

  matrix.fillScreen(15);
  matrix.fillRect(0,0,5,5,matrix.Color(0,255,255));

  if ( ethanolVal > threshold ) {
    tone(beepPin, 988, 20);
    noTone(beepPin);
    matrix.fillScreen(0);
    matrix.drawRect(0,0,5,5,matrix.Color(255,0,0));
    matrix.drawLine(0,0,4,4,matrix.Color(255,0,0));
    matrix.drawLine(4,0,0,4,matrix.Color(255,0,0));
    matrix.setBrightness(40);
  }

  matrix.show();
  Serial.println(ethanolVal);
}