8 replies to this topic

[pavgud]

I have problem making this I2C LCD (http://www.dfrobot.c...&product_id=135) to work with netduino. I attached two photos to show the wiring. I use the following code:

            I2CDevice lcd = new I2CDevice(new I2CDevice.Configuration(0x27, 400));

            int bytesTransferred = 0;
            string hellow = "hellow";

            System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
            byte[] bytesToSend = encoder.GetBytes(hellow);


                I2CDevice.I2CTransaction[] writeCommandAction = new I2CDevice.I2CTransaction[]      {I2CDevice.CreateWriteTransaction(bytesToSend) };
                bytesTransferred = lcd.Execute(writeCommandAction, 1000);

                Debug.Print("TRANSF> " + bytesTransferred.ToString());
                Debug.Print("TOSEND> " + bytesToSend.Length.ToString());

            }

I tried this code (http://code.tinyclr....lcd1602-module/) as well but without success.

When I connect USB to netduino, display light powers on and the first line can be seen (Powered.jpg). Beyond that nothing happens.

Attached Files

•  Wiring.JPG   1012.71KB   157 downloads
•  Powered.JPG   970.38KB   160 downloads

[Nevyn]

When I connect USB to netduino, display light powers on and the first line can be seen (Powered.jpg). Beyond that nothing happens.

Does the device need you to put pull-up resistors on the I2C bus?

Regards,
Mark

[anthrolume]

I think Nevyn is right. Try a setup like this. This example is using 820-ohm pullups, but you could try 2.2K too.

-Bryan

[nrc]

Yes, pull up resistors needed. try 2k2 You can see my LCD I2C project http://forums.netdui...d-adm1602k-i2c/

[aalmada]

A novice question... I noticed you are all connecting the pull-up resistors to 5V. Pins 4 and 5 are only 3.3V. Isn't it an issue? aalmada

[Nevyn]

When I connect USB to netduino, display light powers on and the first line can be seen (Powered.jpg). Beyond that nothing happens.

And my memory triggered by reading this forum post - try adjusting the contrast - I remember that was my problem a few months ago when I was playing with and LCD.

Regards
Mark

[pavgud]

Hi guys, I just bought my first breadboard ever. Some resistors and LEDs as well LCD lives thanx to you. I use 4k7 resistors and wiring like anthrolume recommended. Thnx all.

[anthrolume]

I just bought my first breadboard ever. Some resistors and LEDs as well

LCD lives thanx to you. I use 4k7 resistors and wiring like anthrolume recommended.

Great news! Way to go pavgud!

-Bryan
(anthrolume)

[pher]

Can you make screenshots and share your example solution please? I try the same, but it doesn't work