Arduino with millis function - computer cycle

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Arduino with millis function - computer cycle

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#1 by (0 votes)

7

I'm trying to set up a computer cycle with Arduino that displays the offset and speed on a 16x2 LCD display, but I'm having trouble calculating speed. The displacement traveled is working perfectly, but the speed is only 0 km / h. I am a layman in programming, if anyone can help me, thank you very much! Here is the schedule:

# include <LiquidCrystal.h>
LiquidCrystal lcd(4, 5, 6, 7, 8, 9);  
int hallsensor = 12;  
int contraste = 10;  // PINO 3 LCD  
int iluminacao = 11;  // PINO 15 LC  
int vcontraste = 80;  // PWM CONTRASTE DISPLAY LCD  
int viluminacao = 255;  // PWM ILUMINAÇÃO DISPLAY LCD  
float distancia;  
float kilometros;  

void setup()  
{  
  Serial.begin(9600);  
  lcd.begin(16, 2);  
  pinMode(hallsensor, INPUT);  
  pinMode(contraste, OUTPUT);  
  pinMode(iluminacao, OUTPUT);  
}  

void loop()   
{  
  int estado = digitalRead(hallsensor);  
  analogWrite(contraste, vcontraste);  
  analogWrite(iluminacao, viluminacao);  

  if (estado < 1) // COLOQUEI NA ENTRADA ANALOGICA PARA QUE QUALQUER VALOR MENOR QUE 1 SEJA "SENTIDO" ( O IMA PODERA FICAR UM POUCO MAIS DISTANTE DO SENSOR)  
  {  
    distancia = distancia + 2.073656;  
    kilometros = kilometros + 0.002073656;  
    float tempoanterior = millis();  
    float volta = millis() - tempoanterior; // CALCULA O TEMPO DE UMA VOLTA  
    float tempoh = volta * 0000000.277777777; // CONVERTE O TEMPO DE UMA VOLTA PARA HORAS  
    unsigned long velocidade = (0.002073656/tempoh); // CALCULA A VELOCIDADE MEDIA DE UMA VOLTA EM KM/H  
    if (distancia<1000)  
    {  
      lcd.setCursor(0, 0);  
      lcd.print("Dis: ");  
      lcd.print(distancia);  
      lcd.print(" m");  
      Serial.print("Dis: ");  
      Serial.print(distancia);  
      Serial.println(" m");  
      lcd.setCursor(0, 1);  
      lcd.print("Vel: ");  
      lcd.print(velocidade);  
      lcd.print(" Km/h");  
    }  
    if (distancia>=1000)  
    {  
      lcd.setCursor(0, 0);  
      lcd.print("Dis: ");  
      lcd.print(kilometros);  
      lcd.print(" Km ");  
      Serial.print("Dis: ");  
      Serial.print(kilometros);  
      Serial.println(" m");  
      lcd.setCursor(0, 1);  
      lcd.print("Vel: ");  
      lcd.print(velocidade);  
      lcd.print(" Km/h");  
    }  
  }  
}

arduino

asked by anonymous 08.03.2015 / 01:08

1 answer

Add checkbox to a JTree Error generating files / classes from a Web Service with Netbeans

score 0 · Answer 1

For this type of application you should consider using an interrupt pin 2 or 3 of arduino each pin step interrupts the program and counts a variable.

You can use millis only to know when time has passed for a period of time such as seconds or minutes.

link

Calibrate the sensor to know when it has reached 1 meter this will give you a reference

You can add average speeds and other types of measures.

Start from this code

// teste de velocidade 


unsigned long contaPulso;       
float kmh = 0;
unsigned long distancia;
unsigned long time = 1000;
int enable = 1;

void setup(){
Serial.begin(9600);            
pinMode(2, INPUT);
attachInterrupt(0, incpulso, FALLING); //Configura o pino 2(Interrupção 0) interrupção
}


void loop (){

if (enable == 1){contaPulso = 0; sei(); enable = 0;}

if (millis() => time){

  cli();
  Serial.println(time); 
  time = millis() + 1000;  
  enable =1;

  distancia = contaPulso + [seu valor de calibração];
   kmh = distancia * 3,6; 
  Serial.print(distancia);
  Serial.println("distancia  ");

  Serial.print(kmh);
  Serial.println("KMH  ");


  }


}

void incpulso ()
{contaPulso++;}