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I am connecting a DFRobot LCD shield (http://www.dfrobot.com/index.php?route=product/product&product_id=51#.UYWE0itxsVk) to a bareduino. There will be no shield placed on top of the LCD and am looking to minimally connect it to the bareduino.

What I believe must be connected:

  • D4-D10
  • A0
  • 5V
  • GND

Candidates for not being connected:

  • Reset
  • A1-A5
  • D0-D3, D11-D13
  • AREF
  • 2 GNDS
  • 3.3V
  • VIN

What pins must be connected?

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It depends on what you want, just the lcd or the complete functionality of the shield (lcd + buttons).

If you just want the lcd:
D4-D10
5V
GND

If you want the lcd + buttons:
D4-D10
A0
5V
GND

It is explained clearly in the manual: ( @ pin allocation)
http://www.dfrobot.com/wiki/index.php?title=Arduino_LCD_KeyPad_Shield_(SKU:_DFR0009)

The rest of the pins are there for other shields to stack below / above it.

Edit:
Here are the schematics: http://www.dfrobot.com/image/data/DFR0009/LCDKeypad%20Shield%20V1.0%20SCH.pdf

It uses 5V because the VCC pin on the schematic matches the +5V pin on the arduino Uno

In the schematic you can also see that the other pins are not used.

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  • \$\begingroup\$ Where in the pin allocation does it list 5V or GND? Do all grounds need to be connected? How are you sure 3.3V or AHREF aren't used? \$\endgroup\$ – Robert Lee Murrer III May 5 '13 at 0:02
  • \$\begingroup\$ If you open the schematics you can see they do nothing. Ahref is the analog reference pin of the arduino and in the schematic it connects to nothing. It is 5 V because the vcc connector in the schematic matches the +5V pin of the arduino Uno. \$\endgroup\$ – Spikee May 5 '13 at 0:09

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