4 replies to this topic

[monsterhunter445]

Hello everyone, I am new to Netduino, I have already done a few things like the blinking LED and light sensor (using photoresistor). When I purchased my Netduino Plus 2, I purchased a SainSmart IIC/I2C/TWI Serial 2004 20x4 LCD Module Shield For Arduino UNO MEGA R3. I assume it is compatible with my Netduino Plus 2. Anyway a link to the LCD will be given below, along with the source code. When I try to print Hello World using the Micro Liquid Crystal library, I get nothing on the screen, And an exception occurs in the constructor of the LCD provider. I have no idea what to do and I do not think it is an address issue since I have tried 0x3F (0011 1111) and 0x27 (0010 0111)  but nothing changes. I know the LCD works because it is being powered up and I believe it requires 5V to power it up and not 3.3V. I will try to so my setup when I can.

 

How I set it up:

 

GND <-> GND

VCC <-> 5V

SDA <-> A4

SCL <-> A5

 

I also put a resistor on A4 and A5 but to no avail. I will be posting a picture soon. I ran this code:

 

// Micro Liquid Crystal Library// http://microliquidcrystal.codeplex.com// Appache License Version 2.0 using System.Threading;using MicroLiquidCrystal;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware.Netduino;using FusionWare.SPOT.Hardware;namespace HelloWorld{    public class Program    {        public static void Main()        {            // create the transfer provider, use direct GPIO provider            // Initialize the library with the numbers of the interface pins            // Use wiring shown here http://arduino.cc/en/uploads/Tutorial/lcd_schem.png            var bus = new I2CBus();                       var lcdProvider = new MCP23008LcdTransferProvider(bus, 0x27, MCP23008LcdTransferProvider.DefaultSetup);            // create the LCD interface            var lcd = new Lcd(lcdProvider);            // set up the LCD's number of columns and rows:             lcd.Begin(20, 2);            // print a message to the LCD.            lcd.Write("Hello world!");            while (true)            {                lcd.Backlight = true;                // set the cursor to the first column on the second line                lcd.SetCursorPosition(0, 1);                // print the number of milliseconds since reset:                lcd.Write((Utility.GetMachineTime().Ticks / 10000).ToString());                Thread.Sleep(100);                lcd.Backlight = false;                //}            }        }    }}

 

 

 

If anybody can help it me it would be appreciated because I am new to electronics but I am pretty good at programming. Thanks in advanced.

External Links:

 

 http://www.sainsmart...no-mega-r3.html

}

[carb]

MonsterHunter,

 

Wlecome to the forum.

 

I don't think that you can use A4 & A5 for I2C yet. The Netduino 2 Plus has its own SDA & SCL pins at the end of the DIO header. I think that you can tie the A4 to the SDA and A5 to the SCL with a jumper. At least until the firmware is updated to allow using the A4 & A5 connections.

 

Search for SDA & SCL on the forum uner the NP2+ and you should find additional information

 

Chuck

[monsterhunter445]

Thanks, good to know.

[gabesilva]

@MonsterHunter445, I have the same setup as you - a ND+2 with the same I2C LCD. Instead of connecting the SDA and SCL of the LCD to A4 and A5, I tied it to SD and SC repectively. Unfortunately it does not work. I hope someone can provide a simple "Hello World" sample out there for the ND+2 interfacing an I2C LCD. Please advise. Thanks 

[JerryK]

I am having the same issue, and have spent days trying to get it to work. Anybody else have any luck?