Connecting LCD 2004 I2C to arduino uno

Other Hardware Displays
1

Hello,

I would like to buy this product 61-Bit WS2812 5050 RGB LED Full-color Drive Round Development Board - Free shipping - DealExtreme, since it's relatively cheap and the I2C module is already soldered to it, meaning i won't have to mess up with wires :))

I have 2 questions

  1. Will i have to use 4.7K resistors to connect the SLA,SCL to the analog ports, or should it already be "built in" to the board?
  2. Which code lib should/can i use with this screen?

I have noticed that there was a post about this product, how ever it have many broken links within it

Thanks,

2

tsachi:
Hello,

I would like to buy this product http://dx.com/p/arduino-iic-i2c-serial-blue-backlight-lcd-2004-module-display-138616, since it's relatively cheap and the I2C module is already soldered to it, meaning i won't have to mess up with wires :))

I have 2 questions

  1. Will i have to use 4.7K resistors to connect the SLA,SCL to the analog ports, or should it already be "built in" to the board?
  2. Which code lib should/can i use with this screen?

I have noticed that there was a post about this product, how ever it have many broken links within it

Thanks,

(1) Yes you will most likely have to connect pull-up resistors between the SLA and SCL lines and +5 V.
(2) You should use the 'New LiquidCrystal Library' by FM.
and
(3) Before trying to display anything you should run an I2C port scanner to determine the actual address of your device.

Don

3

tsachi:

  1. Will i have to use 4.7K resistors to connect the SLA,SCL to the analog ports, or should it already be "built in" to the board?
  2. Which code lib should/can i use with this screen?

No resistors and use the LiquidCrystal_I2C library, the first lines of code being:

#include <LiquidCrystal_I2C.h>
#include "Wire.h"
LiquidCrystal_I2C lcd(0x27,20,4);
4

You don't use the 4.7K resistors to "connect" it (ie. in series) however as pull-ups they may be helpful.

5

Thank you all,

I baught it, I hope it will work well :slight_smile:

I ment as pull-ups ofc :slight_smile:

Regards,