Heare is a Speed meater by BAXX
an Arduino user.

source: http://www.smartphone-time.com/2011/09/09/arduino-samp-speedmeter/









SAMP sends vehicle speed to a php script which a program on pc reads and echoes that data to COM port, so you can plug in this speed meter to a remote pc and monitor if your friend is speeding in samp.



<-- This is computer softwere.

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Fading


Demonstrates the use of the analogWrite() function in fading an LED off and on. AnalogWrite uses pulse width modulation (PWM), turning a digital pin on and off very quickly, to create a fading effect.


The Circuit




Connect the anode (the longer, positive leg) of your LED to digital output pin 9 on your Arduino through a 220-ohm resistor. Connect the cathode (the shorter, negative leg) directly to ground.

/*
 Fade

 This example shows how to fade an LED on pin 9
 using the analogWrite() function.

 This example code is in the public domain.

 */
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

void setup()  {
  // declare pin 9 to be an output:
  pinMode(9, OUTPUT);
}

void loop()  {
  // set the brightness of pin 9:
  analogWrite(9, brightness);  

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade: 
  if (brightness == 0 || brightness == 255) {
    fadeAmount = -fadeAmount ;
  }  
  // wait for 30 milliseconds to see the dimming effect    
  delay(30);                          
}

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Tags: Arduino projects

LiquidCrystal - autoscroll

The Liquid Crystal Library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface.
This example sketch shows how to use the autoscroll() and noAutoscroll() methods to move all the text on the display left or right.
autoscroll() moves all the text one space to the left each time a letter is added
noAutoscroll() turns scrolling off
This sketch prints the characters 0 to 9 with autoscroll off, then moves the cursor to the bottom right, turns autoscroll on, and prints them again.

Hardware Required

• Arduino Board
• LCD Screen (compatible with Hitachi HD44780 driver)
• 10k Potentiometer
• breadboard
• hook-up wire

Code

/*
  LiquidCrystal Library - Autoscroll

 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.

 This sketch demonstrates the use of the autoscroll()
 and noAutoscroll() functions to make new text scroll or not.

 The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)

 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

// include the library code:
#include

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16,2);
}

void loop() {
  // set the cursor to (0,0):
  lcd.setCursor(0, 0);
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 10; thisChar++) {
   lcd.print(thisChar);
   delay(500);
  }

  // set the cursor to (16,1):
  lcd.setCursor(16,1);
  // set the display to automatically scroll:
  lcd.autoscroll();
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 10; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }
  // turn off automatic scrolling
  lcd.noAutoscroll();
 
  // clear screen for the next loop:
  lcd.clear();
}

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Tags: Arduino projects