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Step 1 - That´s the material you need:Arduino, LCD-Display, 10K Potentiometer, USB-Cable, some Hook-Up Wires and a solderless breadboard
Step 2 First we connect the 5V and the Ground to the rails of the breadboard.Then we stick on the potentiometer and connect it to 5V and Ground.
Step 3 Now we stick on the Display and connect it to 5V(second pin) and Ground(first pin).We connect the third pin of the LCD to the "WIPER(=Middle pin)" of the potentiometer
Step 4 Now turn the backlight on! Connect the sixteenth pin to Ground and the fithteenth pin to 5V.Plug in the USB-Cable and you see that the backlight is lighting up!
Step 5 Now its time to connect the data!See next step to see the connections!
Step 6 Display Pin|Arduino Pin4|125|116|107/8/9/10|No connection11|712|613|5 and 14|4