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1  Using Arduino / Displays / Re: 1902 Shift Errors on: November 23, 2012, 06:58:27 pm
Hey Bill thanks,

I came across that library shortly after posting. In fact I am working on your 2 wire set up ( that is when I get around to it, I have a 14M old).

If I have questions can I message you?

2  Using Arduino / Displays / 1902 Shift Errors on: November 15, 2012, 12:05:38 pm
Hey guys,

I am pretty new to all this, but I am having some troubles shifting out to a 1602 LCD. I have read through some other threads and haven't been able to solve my problems yet.

I am trying to use the ShiftLCD library, but I am getting two errors:

In file included from Display.pde:56:
C:\Users\rick\Desktop\arduino-1.0.2\libraries\ShiftLCD/ShiftLCD.h:116: error: conflicting return type specified for 'virtual void ShiftLCD::write(uint8_t)'
C:\Users\rick\Desktop\arduino-1.0.2\hardware\arduino\cores\arduino/Print.h:48: error:   overriding 'virtual size_t Print::write(uint8_t)'

Here is the code that I am using.

Any help is appreciated. Thanks

  ShiftLCD Library - Display
 Demonstrates the use a 16x2 LCD display.  The ShiftLCD 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 uses the
 display() and noDisplay() functions to turn on and off
 the display.
  The circuit:
 ---Shift Register 74HC595---
 * SR Pin 14 to Arduino pin 2
 * SR Pin 12 to Arduino pin 3
 * SR Pin 11 to Arduino pin 4
 * SR Pin  8 to Ground
 * SR Pin 16 to +5v
 * SR Pin 13 to Ground
 * SR Pin 10 to +5v
 -----Shift Reg to LCD--------
 * SR Pin 15 to D7
 * SR Pin 1  to D6
 * SR Pin 2  to D5
 * SR Pin 3  to D4
 * SR Pin 5  to MOSFET gate
 * SR Pin 6  to Enable
 * SR Pin 7  to RS
 -----LCD HD44780-------------
 * Vss to Ground
 * Vdd to +5V
 * Vo  to 10k Wiper
 * R/W to Ground
 * 5v  to +5v
 * Gnd to MOSFET Drain
 ------N Chanel MOSFET--------
 * Source to Ground
 * Gate   to SP Pin 5
 * Drain  to LCD Gnd
 * 1k Resistor Between gate and source
 For a more detailed schematic, please see my blog:
 Library modified from the original LiquidCrystal Library
 This example originaly by Tom Igoe, Jul 2009
 Example modified for use with ShiftLCD
 Chris Parish, January 12th 2010

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

// initialize the library with the numbers of the interface pins
ShiftLCD lcd(2, 4, 3);

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

void loop() {
  // Turn off the display:
   // Turn on the display:
3  Using Arduino / Project Guidance / Quiz Cache on: July 28, 2012, 07:14:51 am
I am looking to combine two hobbies of mine, electronics and geocaching.

I have a idea for a geocache where the in order to have access to the log you must first correctly answer three randomly chosen questions.

My vision looks like this:

4 LCDs, 1 to read the question and the remaining three would each have a possible answer, each of the 3 answer LCDs will have a button to act asinput from the user to select a correct answer

What I am looking for is to read a random question from a bank of questions stored on an sd card and print the question and each answer to its own LCD and for the arduino to know if the input from the user is correct or incorrect.

Once the user has 3 correct answers a servo will allow access to the log.

Can anyone point me in a direction that may assist me in this..

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