Standard 16X2 LCD character module (backlit / blue)
1602 using a standard 16-pin interface, where:
The first Foot : VSS is ground power
Second Foot : VDD 5V positive power supply connection
Third Foot: V0 end liquid crystal display contrast adjustment, contrast weakest connected to the positive supply, the highest contrast, will have a “ghosting” grounded power when the contrast is too high, you can adjust the contrast through a 10K potentiometer when using.