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Problem with Serial LCD 16x2

Hi 4 all,

I use this LCD display for Arduino 328 :

http://www.emartee.com/product/41872/Arduino-Serial-LCD-1602-Shield

how can i print a variable on the lcd ?

 

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I will try to display variable con with value 12 . This display nedd command $PRINT or \n\r

Without command with start  "$PRINT" and stop with \n\r\ LCD not displayed . And variables between is displayed as string not value.