Digital speedometer using a TM1637 type display

Speedometer_TM1637.ino

// Matthew McMillan 
// @matthewmcmillan
// http://matthewcmcmillan.blogspot.com
//
// Digital speedometer that uses a TM1637 type display
//
// Code is written for an Arduino UNO
//
// VSS on car connects to  digital pin 5
// CLK on display to digital pin 3
// DIO on display to digital pin 2
//
//
// http://playground.arduino.cc/Main/TM1637
//
//


#include "TM1637.h" // Seven Segment display library

// Setup TM1637 Display
#define CLK 3 //pin definitions for TM1637 and can be changed to other ports    
#define DIO 2
TM1637 tm1637(CLK,DIO);


const int hardwareCounterPin = 5;
const int samplePeriod = 1000; //in milliseconds
const float pulsesPerMile = 4000; //This value is different for different vehicles
const float convertMph = pulsesPerMile/3600;
unsigned int count;
float mph;
unsigned int imph;
int roundedMph;
int previousMph;
int prevCount;

void setup(void) {
  Serial.begin(9600);
  //Serial.println("Startup...");

  tm1637.set(BRIGHT_TYPICAL);//BRIGHT_TYPICAL = 2,BRIGHT_DARKEST = 0,BRIGHTEST = 7;
  tm1637.init();

  TCCR1A = 0; //Configure hardware counter 
  TCNT1 = 0;  // Reset hardware counter to zero  
  
}

void loop() {
  
  /////////////////////////////////////////////////////////////
  // This uses the hardware pulse counter on the Arduino.
  // Currently it collects samples for one second.
  //
  bitSet(TCCR1B, CS12); // start counting pulses
  bitSet(TCCR1B, CS11); // Clock on rising edge
  delay(samplePeriod); // Allow pulse counter to collect for samplePeriod
  TCCR1B = 0; // stop counting
  count = TCNT1; // Store the hardware counter in a variable
  TCNT1 = 0;     // Reset hardware counter to zero
  mph = (count/convertMph)*10; // Convert pulse count into mph.
  imph = (unsigned int) mph; // Cast to integer. 10x allows retaining 10th of mph resolution.

  int x = imph / 10;
  int y = imph % 10;
  
  // Round to whole mile per hour
  if(y >= 5){
    roundedMph = x + 1;
  }else{
    roundedMph = x;
  }

  //If mph is less than 1mph just show 0mph.
  //Readings of 0.9mph or lower are some what erratic and can
  //occasionally be triggered by electrical noise.
  if(x == 0){
    roundedMph = 0;
  }
  
  // Don't display mph readings that are more than 50 mph higher than the 
  // previous reading because it is probably a spurious reading.
  // Accelerating 50mph in one second is rocketship fast so it is probably
  // not real.
  if((roundedMph - previousMph) > 50){
    tm1637.display(previousMph);
  }else{
    tm1637.display(roundedMph);
  }
  
  previousMph = roundedMph; // Set previousMph for use in next loop.
}

im tryign this one out keeps giving me a error ..

any idea thanks ..

C:\Users\Angelo\Documents\Arduino\testt\testt.ino: In function 'void loop()':

C:\Users\Angelo\Documents\Arduino\testt\testt.ino:87:31: warning: invalid conversion from 'int' to 'int8_t* {aka signed char*}' [-fpermissive]

 tm1637.display(previousMph);

                           ^

In file included from C:\Users\Angelo\Documents\Arduino\testt\testt.ino:19:0:

C:\Users\Angelo\Documents\Arduino\libraries\DigitalTube/TM1637.h:51:10: note: initializing argument 1 of 'void TM1637::display(int8_t*)'

 void display(int8_t DispData[]);

      ^

C:\Users\Angelo\Documents\Arduino\testt\testt.ino:89:30: warning: invalid conversion from 'int' to 'int8_t* {aka signed char*}' [-fpermissive]

 tm1637.display(roundedMph);

                          ^

In file included from C:\Users\Angelo\Documents\Arduino\testt\testt.ino:19:0:

C:\Users\Angelo\Documents\Arduino\libraries\DigitalTube/TM1637.h:51:10: note: initializing argument 1 of 'void TM1637::display(int8_t*)'

 void display(int8_t DispData[]);

having problem finding the library you used can you help me out thanks

having problem finding the library you used can you help me out thanks

I have a same problem. :(