Plug-and-Play Compatible Boards

The LCD Shield is tested and fully compatible with the following boards:

• Arduino Uno (all revisions)
  
• Arduino Leonardo
• Arduino Mega 2560 R3 (not R2 or earlier, see below)
• Arduino Mega ADK
• Arduino Duemilanove and Diecimila (all revisions)
  
• Arduino Due (using latest library)
• Adafruit Menta
  

Incompatible or Partially-Compatible Boards

This shield may work with other boards with some additional steps:

Arduino Mega 2560 R2

• Add jumper wire from SDA or Analog Pin 4 on shield to pin 20 on Mega board.
  
• Add jumper wire from SCL or Analog Pin 5 on shield to pin 21 on Mega board.

Pin and Address Reference

The shield uses the following pins:

• +5V
  
• GND
  
• SDA and SCL (on boards that have these pins)
• Analog pins 4 and 5 (see notes below)

This an I²C device (uses the Wire library) and can usually be stacked or shared with other I²C shields and devices, provided that each has a unique address. This shield has a fixed address of 0x20.

Do not use Analog pins 4 or 5 with your project in combination with this shield, even on Arduino boards that use different pins for I²C communication (Leonardo, Mega, Due). For compatibility with “classic” (pre-R3) Arduino boards, the shield connects SDA and SCL to Analog pins 4 and 5, respectively; communication and analog readings would mutually interfere. Leonardo users should likewise avoid Digital pins 2 and 3 when using I²C.

Untested Boards and Other Notes

• Arduino Mega 1280: compatibility is likely similar to the Mega 2560 R2; extra jumper wires would be required.
  
• Arduino NG or older: possibly compatible, memory constraints permitting.
  

If you have specific experience with this shield on the above boards or others, please use the Feedback & Corrections link at left. Thanks!

If experiencing trouble with a board listed as “compatible,” review the introduction for tips and visit the Adafruit Forums for assistance.