In this video I tech you how to keypad and lLCD interfacing with arduino in bangla
In Embedded system design, matrix keypad (4×4, 4×3, 3×3 or 5×5) is used for key in the user inputs. Similarly character LCD display [16×2, 16×4, 20×2 or 20×4 LCDs] is used for indicating the system status / parameters. This intractable is about interfacing 16×2 LCD and 4×4 matrix keypad with Arduino microcontroller.
Program download Link: https://www.mediafire.com/file/911a993s9gmgr72/Program.rar/file
Library download link 1:https://www.mediafire.com/file/lywvguri41xig5s/LCDKeypad-master.zip/file
Library download link 2
Parts and components
Arduino Uno board
1 K ohm potentiometer
4×4 matrix keypad
Topics covered in this video
1/ 4×4 keypad and lcd interfacing with arduino,
2/ 4×3 keypad and lcd interfacing with arduino,
3/ arduino keypad and lcd,
4/ connect lcd and keypad to arduino,
5/ arduino keypad project,
6/ 4×4 keypad and lcd interfacing with arduino mega,
7/ arduino keypad calculator lcd 16×2,
The 16×2 is very common type LCD, with two rows, and each row displays 16 characters of either 5×7 or 5×8 dot matrix characters.
The LCD is available in a 16 pin package. It consists of back light and contrast adjustment function and each dot matrix has 5×8 dot resolution.
The 16×2 LCD display is connected to the Arduino (A0,A1,A2,A3,A4,A5) analog IO pins, where those pins are configured as digital in / out, where LCD operates at 4 bit data mode.If the display is not visible, adjust the Contrast pot (1K), to make it visible.Matrix key pad is arranged by push button switches in rows and columns.In a simple technique, the 16 keys of matrix keypad is connected with 8 digital IOpins of Arduino.
Usually the keypad scan procedure is
The key is decoded through Column selection / Row read.Write HIGH to Column One. And keep rest of the Column to LOW.Scan (Read) the Row One to Row Four, to find the key.Repeat until a key press (are multiple) is identified.The Row pins are connected to 5,4,3 and 2nd digital IO pins of Arduino.The Column pins are connected to 6,7,8 and 9th digital IO pins of Arduino.
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