<iframe src="https://skydrive.liv...ADIaSTd8kXfcHMU" width="274" height="319" frameborder="0" scrolling="no"></iframe>
copy this where vdd is 5v.
then run this code.
LCD.cs
/*-------------------------------------------------------------------------------+|| Copyright (c) 2012, Embedded-Lab. All Rights Reserved.|| Limited permission is hereby granted to reproduce and modify this | copyrighted material provided that this notice is retained | in its entirety in any such reproduction or modification.|| Author: ANir| First Version Date: 2012/12/27+-------------------------------------------------------------------------------*/using System;using System.Threading;using Microsoft.SPOT.Hardware;using System.Text;namespace EmbeddedLab.NetduinoPlus.Day2.Display{ public class LCD { #region Constructor public LCD(Cpu.Pin rs, Cpu.Pin enable, Cpu.Pin d4, Cpu.Pin d5, Cpu.Pin d6, Cpu.Pin d7, byte columns, Operational lineSize, int numberOfRows, Operational dotSize) { RS = new OutputPort(rs, false); Enable = new OutputPort(enable, false); D4 = new OutputPort(d4, false); D5 = new OutputPort(d5, false); D6 = new OutputPort(d6, false); D7 = new OutputPort(d7, false); Columns = columns; DotSize = (byte)dotSize; NumberOfLines = (byte)lineSize; NumberOfRows = numberOfRows; Initialize(); } #endregion #region Public Methods public void Show(string text, int delay, bool newLine) { if (newLine) dirtyColumns = 0; foreach (char textChar in text.ToCharArray()) { ResetLines(); Show(Encoding.UTF8.GetBytes(textChar.ToString())); dirtyColumns += 1; Thread.Sleep(delay); } } public void Show(string text) { string[] splitedText = SplitText(text); Show(splitedText); } public void ClearDisplay() { SendCommand((byte)Command.Clear); currentRow = 0; dirtyColumns = 0; } public void GoHome() { SendCommand((byte)Command.Home); currentRow = 0; dirtyColumns = 0; } public void JumpAt(byte column, byte row) { if (NumberOfLines == (byte)Operational.DoubleLIne) row = (byte)(row % 4); else row = (byte)(row % 2); SendCommand((byte)((byte)Command.SetDdRam | (byte)(column + rowAddress[row]))); //0 based index } public void PushContentToLeft() { SendCommand(0x18 | 0x00); } public void PushContentToRight() { SendCommand(0x18 | 0x04); } #endregion #region Private Methods private void Initialize() { //initialize fields isVisible = true; showCursor = false; isBlinking = false; rowAddress = new byte[] { 0x00, 0x40, 0x14, 0x54 }; firstHalfAddress = new byte[] { 0x10, 0x20, 0x40, 0x80 }; secondHalfAddress = new byte[] { 0x01, 0x02, 0x04, 0x08 }; currentRow = 0; dirtyColumns = 0; Thread.Sleep(50); // must wait for a few milliseconds // RS to high = data transfer // RS to low = command/instruction transfer RS.Write(false); // Enable provides a clock function to synchronize data transfer Enable.Write(false); // Set for 4 bit model Write(0x03, secondHalfAddress); Thread.Sleep(4); Write(0x03, secondHalfAddress); Thread.Sleep(4); Write(0x03, secondHalfAddress); Thread.Sleep(150); Write(0x02, secondHalfAddress); // Set the LCD properties byte operationalValue = (byte)((byte)Operational.FourBit | (byte)NumberOfLines | (byte)DotSize); SendCommand((byte)((byte)Command.Operational | operationalValue)); UpdateDisplayOptions(); ClearDisplay(); byte entranceValue = (byte)Entrance.FromLeft | (byte)Entrance.ShiftDecrement; SendCommand((byte)((byte)Command.Entrance | entranceValue)); } private string[] SplitText(string str) { if (str.Length > Columns * NumberOfRows) str = str.Substring(0, Columns * NumberOfRows); int stringArrayCounter = 0; dirtyColumns = 0; char[] charArray = str.ToCharArray(); int arraySize = (int)System.Math.Ceiling((double)(str.Length + dirtyColumns) / Columns); string[] stringArray = new string[arraySize]; for (int i = 0; i < charArray.Length; i++) { if (dirtyColumns < Columns) { stringArray[stringArrayCounter] = stringArray[stringArrayCounter] + charArray[i]; dirtyColumns += 1; } else { dirtyColumns = 1; stringArrayCounter += 1; stringArray[stringArrayCounter] = stringArray[stringArrayCounter] + charArray[i]; } } return stringArray; } private void ResetLines() { if (dirtyColumns == 0) return; if (dirtyColumns % Columns == 0) { currentRow += 1; JumpAt((byte)0, (byte)(currentRow)); } } private void Write(byte[] data) { foreach (byte value in data) { Write(value, firstHalfAddress); // First half Write(value, secondHalfAddress); // Second half } } private void Write(byte value, byte[] halfAddress) { D4.Write((value & halfAddress[0]) > 0); D5.Write((value & halfAddress[1]) > 0); D6.Write((value & halfAddress[2]) > 0); D7.Write((value & halfAddress[3]) > 0); Enable.Write(true); Enable.Write(false); //Debug.Print("Wrote " + value.ToString()); } private void SendCommand(byte value) { RS.Write(false); // command/instruction transfer Write(new byte[] { value }); Thread.Sleep(5); } private void UpdateDisplayOptions() { byte command = (byte)Command.DisplayControl; command |= isVisible ? (byte)DisplayControl.ScreenOn : (byte)DisplayControl.ScreenOff; command |= showCursor ? (byte)DisplayControl.CursorOn : (byte)DisplayControl.CursorOff; command |= isBlinking ? (byte)DisplayControl.BlinkBoxOn : (byte)DisplayControl.BlinkBoxOff; SendCommand(command); } private void Show(string[] splitedText) { foreach (string text in splitedText) { JumpAt((byte)0, (byte)(currentRow)); currentRow += 1; Show(Encoding.UTF8.GetBytes(text)); } } private void Show(byte[] bytes) { RS.Write(true); Write(bytes); } #endregion #region Public Properties public bool IsVisible { get { return isVisible; } set { isVisible = value; UpdateDisplayOptions(); } } public bool IsBlinking { get { return isBlinking; } set { isBlinking = value; UpdateDisplayOptions(); } } public bool ShowCursor { get { return showCursor; } set { showCursor = value; UpdateDisplayOptions(); } } #endregion #region Fields private OutputPort RS; private OutputPort Enable; private OutputPort D4; private OutputPort D5; private OutputPort D6; private OutputPort D7; private byte Columns; private byte DotSize; private byte NumberOfLines; private byte[] rowAddress; private byte[] firstHalfAddress; private byte[] secondHalfAddress; private byte visibilityValue; private int currentRow; private int dirtyColumns; private int NumberOfRows; private bool isVisible; private bool showCursor; private bool isBlinking; #endregion #region Enums public enum Command : byte { Clear = 0x01, Home = 0x02, Entrance = 0x04, DisplayControl = 0x08, Move = 0x10, Operational = 0x20, SetCgRam = 0x40, SetDdRam = 0x80 } public enum Entrance : byte { FromRight = 0x00, FromLeft = 0x02, ShiftIncrement = 0x01, ShiftDecrement = 0x00 } public enum DisplayControl : byte { ScreenOn = 0x04, ScreenOff = 0x00, CursorOn = 0x02, CursorOff = 0x00, BlinkBoxOn = 0x01, BlinkBoxOff = 0x00 } public enum Operational : byte { Dot5x10 = 0x04, Dot5x8 = 0x00, SingleLine = 0x00, DoubleLIne = 0x08, FourBit = 0x00 } #endregion }}Program.cs
/*-------------------------------------------------------------------------------+|| Copyright (c) 2012, Embedded-Lab. All Rights Reserved.|| Limited permission is hereby granted to reproduce and modify this | copyrighted material provided that this notice is retained | in its entirety in any such reproduction or modification.|| Author: ANir| First Version Date: 2012/12/27+-------------------------------------------------------------------------------*/using System;using System.Threading;using SecretLabs.NETMF.Hardware.NetduinoPlus;using EmbeddedLab.NetduinoPlus.Day2.Display;namespace EmbeddedLab.NetduinoPlus.Day2{ public class Program { public static void Main() { LCD lcd = new LCD( Pins.GPIO_PIN_D8, // RS Pins.GPIO_PIN_D9, // Enable Pins.GPIO_PIN_D4, // D4 Pins.GPIO_PIN_D5, // D5 Pins.GPIO_PIN_D6, // D6 Pins.GPIO_PIN_D7, // D7 20, // Number of Columns LCD.Operational.DoubleLIne, // LCD Row Format 4, // Number of Rows in LCD LCD.Operational.Dot5x8); // Dot Size of LCD while (true) { lcd.ShowCursor = true; lcd.Show("www.Embedded-Lab.comWelcome's you to Netduino Tutorial site. Happy Learning! :)", 200, true); Thread.Sleep(5000); // reading time for the viewer lcd.ClearDisplay(); lcd.ClearDisplay(); lcd.Show("That was cool! Let's clear the display and show all text at once", 200, true); Thread.Sleep(1000); // reading time for the viewer lcd.ClearDisplay(); lcd.ShowCursor = false; lcd.Show("ABCDEFGHILKLMnopqrstuvwxyz0123456789 -Thanks!"); } } }}Works for me.
Courtesy of embedded lab.
If this doesn't work I'm thinking the display needs 5v logic signals not 3.3v. Get back to me but you'll need to use a shift register though?
Grant
