Sketch contachilometri per la bicicletta con display SH1106

// Sketch by GIOVANNI AGGIUSTATUTTO

/*********************************************************************
  This is an example for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98

  This example is for a 128x64 size display using I2C to communicate
  3 pins are required to interface (2 I2C and one reset)

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada  for Adafruit Industries.
  BSD license, check license.txt for more information
  All text above, and the splash screen must be included in any redistribution
*********************************************************************/

/*********************************************************************
  I change the adafruit SSD1306 to SH1106

  SH1106 driver don't provide several functions such as scroll commands.

*********************************************************************/

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH1106.h>

#define OLED_RESET 4
Adafruit_SH1106 display(OLED_RESET);

const float circonferenza = 2.12;

int rp5s = 0;
float rTOT = 0;
int kmh = 0;
float m = 0;
float km = 0;

int b1;
int b2;
int b3;
int b4;
int b5;
float battery = 0;

bool led = false;

void setup()   {
  //Serial.begin(9600);
  pinMode(2, INPUT);

  pinMode(13, OUTPUT);

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
  display.begin(SH1106_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)
  // init done

  // Show image buffer on the display hardware.
  // Since the buffer is intialized with an Adafruit splashscreen
  // internally, this will display the splashscreen.
  display.display();

  b1 = analogRead(A0);
  delay(100);
  b2 = analogRead(A0);
  delay(100);
  b3 = analogRead(A0);
  delay(100);
  b4 = analogRead(A0);
  delay(100);
  b5 = analogRead(A0);

  battery = (b1 + b2 + b3 + b4 + b5) / 5 * 5.0 / 1023;
  display.clearDisplay();
  delay(200);
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.println(" Ciao!");

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 25);
  display.println(" Batteria");

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 45);
  display.print(" ");
  display.print(battery);
  display.println(" V");

  display.display();

  delay(5000);

  // Clear the buffer.
  display.clearDisplay();
}

void loop() {
  attachInterrupt(digitalPinToInterrupt(2), function, RISING);
  delay(5000);
  detachInterrupt(2);

  kmh = (rp5s) / 5.0 * circonferenza * 3.6;
  m = (rTOT) * circonferenza;
  km = m / 1000.0;

  display.clearDisplay();

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.print(" ");
  display.print(kmh);
  display.println(" Km/h");

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 25);
  display.print(" ");
  display.print(km);
  display.println(" Km");

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 45);
  display.print(" ");
  display.print(millis() / 60000);
  display.println(" min");

  display.display();

  rp5s = 0;
}

void function() {
  rTOT = rTOT + 1.0;
  rp5s = rp5s + 1.0;
  //Serial.println(".");
  digitalWrite(13, led);
  led = !led;
}