The Start

Hi, What and Why

Plug it in

Rule number 1

Water Sensor

Sound Sensor


Tri Colour LED

RTC (Real Time Clock) DS1302

RTC (Real Time Clock) DS3231

Matrix LED step 1


Stepper Motor

LCD revisited with PCF8574T

Humidity Sensor

Shift Register

RFID tags (RC-522)

7 Segment display

Ultrasonic distance sensor

5V regulator

analogRead and analogWrite

Wiring an Array of Switches

The next step

Other things I have bought

Infra red and Processing

Programming a separate arduino chip

Creating your own PCB

L293D for a DC motor

4 digit 7 segment display

Starting with motors

RF433 Wireless Comms

Sort a character array

More stuff

I2C devices (SDA,SCL)

I2C scanner

SPI devices (MOSI,MISO)

HMC5883L Compass

MMA7361 Accelerometer

Added projects

Message Display System

4WD robot car
4WD robot car II

4WD robot car COMPLETE

MP3 Player

LCD (16 cols, 2 rows)

LCD (Liquid Crystal Display) lcd1.jpg

This took a while to get working, as the examples and tutorials weren't clear on one important pin.
As you can see, I've soldered all the outputs to the cables that came with my kit.
Note that the 5th pin from the left is coloured red, but should be black.
Note that I have soldered all 8 data pins, but only 4 are needed in the tutorial sketch.

Wired up.
lcd wired

The sensitivity of the potentiometer is surprisingly critical.
Note how my pin 5 (cable accidentally red instead of black) indeed goes to GND. I've since replaced it with the correct black colour to avoid my future confusion.
The text is blurred because it's scrolling.

   Note: This is the tutorial from the arduino site,, with a couple of quick mods to what is 
   actually printed out.
  LiquidCrystal Library - Hello World
 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 prints "Hello World!" to the LCD
 and shows the time.
  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
 *             middle wiper pin to LCD VO pin (pin 3)
 Library originally added 18 Apr 2008 by David A. Mellis
 library modified 5 Jul 2009 by Limor Fried (
 example added 9 Jul 2009 by Tom Igoe
 modified 22 Nov 2010 by Tom Igoe
 This example code is in the public domain.

// include the library code:
#include < LiquidCrystal.h >

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

void setup() {

  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.setCursor(0, 0);
  lcd.print("hello, world!");
  lcd.setCursor(0, 1);
  lcd.print("hello, world!");

void loop() {
    // Print a message to the LCD.
  lcd.setCursor(0, 0);
  lcd.print("hello, world!");
  lcd.setCursor(0, 1);
  lcd.print("hello, world!");
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset: