Hi,
Many thanks I can see where you are comming from but as a new commer the system would not let me post te code. I have probably done this wrong to but here goes.
Regards
#include <Stdio.h>
#define LED 13 //pin for the LED
#define SWITCH 0 //input for REED SWITCH
#include <Fat16.h> // the SD Card library - http://code.google.com/p/fat16lib/
#include <Wire.h>
#include <Time.h>
#include <DS1307RTC.h> // a basic DS1307 library - Arduino Playground - Time
int rim = 2170; //circumference in mm
int val = 0; // used to store input value
int previousVal = 0; // lets not be too repetitious
int debounce = 10; // the debounce time, increase if the output flickers
int cycles = 1; // total number of revolutions
float currentSpeed = 0; // current speed in MPH
float averageSpeed = 0; // average speed since "newRide" was true
unsigned long revTimer; // create a timer that tells us how long we go between pulses,
unsigned long serialTimer; // and one for how long it's been since we sent anything over serial
unsigned long rideTimer; // total time since "newRide" was true
boolean activeRiding = false; // is the bike moving?
boolean activityChange = true; // just a way of keeping track of how long we're inactive
long inactivityTimer; // millis() on which we began inactivity
long activeRidingOffset = 0; // time subtracted from total riding time when calculating average speed
boolean newRide = true; // true if we haven't moved in half an hour or more
float rideDistance = 0; // total distance traveled since "newRide" was true
SdCard card;
Fat16 LogFile;
void setup() {
pinMode(LED, OUTPUT); // tell arduino LED port is an output,
pinMode(SWITCH, INPUT); // and SWITCH port is input
Serial.begin(9600); // start a serial session
revTimer = millis(); // start pulse timer
serialTimer = millis(); // start serial timer
rideTimer = millis(); // start ride timer
// initialize the SD card
if (!card.init())
error(1);
// initialize a FAT16 volume
if (!Fat16::init(&card))
error(2);
// open file for append, create if it doesn't exist
if (!LogFile.open(fileName, O_CREAT | O_APPEND | O_WRITE))
error(3);
// clear write error
LogFile.writeError = false;
LogFile.println("Start");}
void loop(){
if(!activeRiding) {
if(activityChange) {
inactivityTimer = millis();
activityChange = false;
}
} else {
if(activityChange) {
activeRidingOffset += millis() - inactivityTimer;
activityChange = false;
}
}
val=digitalRead(SWITCH); // read input value and store it
if (val==HIGH) { // check whether input is HIGH (magnet is NOT in range of reed switch)
digitalWrite(LED, HIGH); // turn LED on
previousVal = HIGH; // allow the next "pulse" to be counted
} else{
digitalWrite(LED, LOW); // turn LED off
if (previousVal != LOW && millis() - revTimer > debounce) { // we've got a pulse!
pulse();
}
previousVal = LOW; // (in case the magnet is in range of the switch while sitting still)
}
// if it's been too long since the last pulse, assume we're not moving.
if(millis()-revTimer > 2000) {
currentSpeed = 0;
if(activeRiding) { activityChange = true; activeRiding = false; }
}
// if it's been more than fifteen minutes...
if (millis() - revTimer > 15601000) {
// we'll assume it's a new riding session & zero everything out at next pulse.
newRide = true;
}
}
void pulse() {
if(newRide) {
cycles = 0;
averageSpeed = 0;
rideTimer = millis();
rideDistance = 0;
}
cycles++; // The wheel has obviously turned another revolution
rideDistance = (float) rim*cycles/1000; // distance in meters,
rideDistance = rideDistance * 0.000621371192; // converted to miles
currentSpeed = (float) (millis() - revTimer)0.001; // Convert time elapsed to milliseconds to seconds
currentSpeed = rim/currentSpeed; // S = d/t: Rim circumference divided by time elapsed
currentSpeed = currentSpeed0.002237; // MPH Conversion: 1 mm/s = 0.001 m/s * 3600 s/hr * 1 mile / 1609 m = 0.002237 mi/hr
// time ridden since "newRide", in hours, not including inactive time
unsigned long activeRidingMillis = millis() - rideTimer - activeRidingOffset;
float activeRidingHours = (float) activeRidingMillis / 1000/60/60; // convert to hours
averageSpeed = rideDistance / activeRidingHours;
revTimer = millis(); // remember the current moment for speed calculations next time around
sendStats(); // Tell Processing what's going on
newRide = false;
if(!activeRiding) { activityChange = true; activeRiding = true; }
}
void sendStats() {
case 0: // Log data if second(t) = 0
digitalWrite(logLedPin, HIGH);
LogFile.print(siteID); //Site identifier
LogFile.print(',');
LogFile.print(t); //Unix time - Excel Time = (t/86400)+25569
MeterPulseLog(); // Number of watts during logging interval
LogFile.println();
// write the data to the card at the end of every line
if (!LogFile.sync())
error(4);
Serial.print("rideDistance=");
Serial.print(rideDistance,2);
Serial.print("¤tSpeed=");
Serial.print(currentSpeed,2);
Serial.print("&averageSpeed=");
Serial.print(averageSpeed,2);
// send a linefeed character, telling Processing that we're done transmitting.
Serial.print(10,BYTE);
serialTimer = millis();
LogFile.print(','); // print comma to seprate from previous data
LogFile.print(rideDistance,2);
LogFile.print(',');
LogFile.print(currentSpeed,2);
}
// routine handle file errors
void error(int err)
{
// blink forever
while(1)
{
digitalWrite(fileLedPin, HIGH);
delay(err * 200);
digitalWrite(fileLedPin, LOW);
delay(200);
}
}
void pauseWithoutDelay (unsigned long delayInterval)
{
startDelayMillis = millis();
do {
}
while (millis() - startDelayMillis < delayInterval);
}