Connecting Midas I2C LCD to Arduino Due

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1

I have attached a Midas I2C LCD to my Arduino Due and do not see any response from the LCD at all.

I currently have Pin K attached to the 5V output of the Due via a 220 ohm resistor. I have Pin A attached to the ground of the Due. This should at least make the backlight turn on, right?

I also have the following pins attached:
Pin 1 to 5V
Pin 4 to 5V
Pin 5 to Ground
Pin 6 to SDA1
Pin 7 to SCL1
Pin 8 to 5V via a 47k ohm resistor

Any suggestions on just making sure the LCD backlight works at all?

Datasheet: http://www.farnell.com/datasheets/2021772.pdf

2

Read these tutorials, they should give you some relevant information to connect an LCD:

http://2manyprojects.net/lcd-tutorial

3

Neither of the links in reply #1 is relevant to this thread.

  • The first one uses a parallel interface.
  • The second one uses an I2C adapter interface.

I currently have Pin K attached to the 5V output of the Due via a 220 ohm resistor. I have Pin A attached to the ground of the Due. This should at least make the backlight turn on, right?

Wrong! They are reversed. The anode (A) should go to 5V and the cathode (K) to GND. The resistor can go in either lead.

The other connections look OK.

Don