велоспидометр на ардуино

[Stelsss]

есть статья http://www.instructables.com/id/Arduino ... /?ALLSTEPS
пробую потихоньку перепилить её напильником
пока получается вот что

Код: Выделить всё

//bike speedometer
//by Amanda Ghassaei 2012
//<a href="<a href="<a href="http://www.instructables.com/id/Arduino-Bike-Speedometer/" rel="nofollow">http://www.instructables.com/id/Arduino-Bike-Speedometer/</a>" rel="nofollow"><a href="http://www.instructables.com/id/Arduino-Bike-Speedometer/" rel="nofollow">http://www.instructables.com/id/Arduino-Bike-Speedometer/</a></a>" rel="nofollow"><a href="<a href="http://www.instructables.com/id/Arduino-Bike-Speedometer/" rel="nofollow">http://www.instructables.com/id/Arduino-Bike-Speedometer/</a>" rel="nofollow"><a href="http://www.instructables.com/id/Arduino-Bike-Speedometer/" rel="nofollow">http://www.instructables.com/id/Arduino-Bike-Speedometer/</a></a></a>

/*
* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 */

//outputs speed of bicycle to LCD

//calculations
//tire radius ~ 13.5 inches
//circumference = pi*2*r =~85 inches
//max speed of 35mph =~ 616inches/second
//max rps =~7.25

#define reed A0//pin connected to read switch
#include <LiquidCrystal.h>//установил обычный дисплей
LiquidCrystal lcd(12, 11, 5, 4, 3, 6);
//storage variables

int reedVal;
int odo;//количество оборотов колеса
long timer = 0;// time between one full rotation (in ms)
float mph = 0.00;
float circumference;
boolean backlight;
char vivod;

int maxReedCounter = 100;//min time (in ms) of one rotation (for debouncing)
int reedCounter;


void setup(){
  odo=0;
  reedCounter = maxReedCounter;
  circumference = 2095; //здесь явно задал окружность
  pinMode(1,OUTPUT);//tx
  pinMode(2,OUTPUT);//backlight switch
  pinMode(reed, INPUT);
  lcd.begin(16, 2);

  Serial.write(12);//clear

  // TIMER SETUP- the timer interrupt allows preceise timed measurements of the reed switch
  //for mor info about configuration of arduino timers see <a href="<a href="<a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a>" rel="nofollow"><a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a></a>" title="<a href="<a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a>" rel="nofollow"><a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a></a>" rel="nofollow"><a href="<a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a>" rel="nofollow"><a href="http://arduino.cc/playground/Code/Timer1" rel="nofollow">http://arduino.cc/playground/Code/Timer1</a></a></a>
  cli();//stop interrupts

  //set timer1 interrupt at 1kHz
  TCCR1A = 0;// set entire TCCR1A register to 0
  TCCR1B = 0;// same for TCCR1B
  TCNT1 = 0;
  // set timer count for 1khz increments
  OCR1A = 1999;// = (1/1000) / ((1/(16*10^6))*8) - 1
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS11 bit for 8 prescaler
  TCCR1B |= (1 << CS11);
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);

  sei();//allow interrupts
  //END TIMER SETUP

}



ISR(TIMER1_COMPA_vect) {//Interrupt at freq of 1kHz to measure reed switch
  reedVal = digitalRead(reed);//get val of A0
   
  if (reedVal){//if reed switch is closed
    if (reedCounter == 0){//min time between pulses has passed
      mph = (3.6*float(circumference))/float(timer);//calculate miles per hour // и переделал формулу
      odo++;
      timer = 0;//reset timer
      reedCounter = maxReedCounter;//reset reedCounter
    }
    else{
      if (reedCounter > 0){//don't let reedCounter go negative
        reedCounter -= 1;//decrement reedCounter
      }
    }
  }
  else{//if reed switch is open
    if (reedCounter > 0){//don't let reedCounter go negative
      reedCounter -= 1;//decrement reedCounter
    }
  }
  if (timer > 2000){
    mph = 0;//if no new pulses from reed switch- tire is still, set mph to 0
  }
  else{
    timer += 1;//increment timer
  }
}

void displayMPH(){
  lcd.clear();//clear
  lcd.print("Speed ");
  lcd.setCursor(6, 0);
  lcd.print(mph);
  lcd.setCursor(0, 1);
  lcd.print(String(byte(odo*circumference/1000000))+"km "+int(odo*(int(circumference)%1000000))/1000+"m"); //здесь одометр, отдельно км и м, вычислить именно метры элегантней способа не нашел
  lcd.setCursor(11, 1);
  lcd.print(odo);//вывод оборотов колеса для отладки
}

void loop(){
  //print mph once a second
  displayMPH();
  delay(1000);
}

надо как-то решить проблему сохранения одометра
заменить дисплей 1602 на что-то посимпатичней
пересчет метров и километров пути сделать посимпатичней
ну там меню, gps, gprs опционально
это первый проектик, поэтому состоит почти полностью из костылей, но, вроде, работает