It is only 1 week to go!. I am very worried. This week, i focused with the circuit and programming.For programming, i start to write a program to display the RPM and speed. Below is the coding for the programming:
/*
The circuit:
* LCD RS pin to
digital pin 7
* LCD Enable pin to
digital pin 8
* LCD D4 pin to
digital pin 9
* LCD D5 pin to
digital pin 10
* LCD D6 pin to
digital pin 11
* LCD D7 pin to
digital pin 12
* LCD R/W pin to
ground
* 10K resistor:
* ends to +5V and
ground
* wiper to LCD VO pin
(pin 3)
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface
pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
int ledPin = 13; // choose pin for the LED
float start, finished;
float elapsed, time;
float circMetric=0.04; // wheel circumference relative to
sensor position (in meters)
float circImperial; // using 1 kilometer = 0.621371192 miles
float speedk, speedm;
// holds calculated speed vales in metric and imperial
void setup() {
// set up the LCD's
number of columns and rows:
lcd.begin(16, 2);
pinMode(2,INPUT);
pinMode(ledPin,
OUTPUT); // declare LED as output
attachInterrupt(0,
speedCalc, HIGH); // interrupt called when sensors sends digital 2 high (every
wheel rotation)
start=millis();
circImperial=circMetric*.62137; // convert metric to imperial for MPH
calculations
// Print a message to
the LCD.
lcd.print(" Welcome
");
lcd.setCursor(0, 1);
lcd.print("
Mc-Ergocycle ");
}
void speedCalc()
{
elapsed=millis()-start;
start=millis();
speedk=(3600*circMetric)/elapsed; // km/h
speedm=(3600*circImperial)/elapsed; // Miles per hour
}
void loop() {
if (
digitalRead(2)== HIGH) // ==
digunakan bagi declare condition
{ digitalWrite(ledPin, HIGH); // turn LED OFF
} else {
digitalWrite(ledPin, LOW); // turn LED ON
}
delay (1000);
Serial.println(elapsed);
Serial.println(speedk);
Serial.println(speedm);
Serial.println();
lcd.setCursor(0,0);
lcd.print(int(speedk));
lcd.print("
km/h ");
lcd.print(int(speedm));
lcd.print("
MPH ");
lcd.setCursor(0,1);
lcd.print(int(elapsed));
lcd.print("
ms/rev ");
delay(1000); //
}
Then, i uploading to Atmega328P-PU through Arduino board. At first, the LCD does not display anything and just light on. I troubleshoot the circuit and found that pin 7 on Atmega which is connect to 5Volt (VCC) pin must be jumped straight to the Vout of Voltage Regulator. The result is as follow:
 |
| Display result |
Then, i make some modification on the bicycle which is change the colour from red to yellow. I spray it by using the paint spray that i have bought at Careffour Wangsa maju.
 |
| Paint Spray |
Then, i attached the display circuit to the bicycle and Below is the Video of the finiched cycle ergometer. This video has showed the cycle ergometer operation:
The demo and presentation of Final Year Project is on 24 April 2012 (next week).I make some preparation for next week by design the poster and troubleshoot the circuit.
