LCD Keypad Shield LCD1602 for Arduino

The LCD Keypad Shield LCD1602 with Keypad Shield provides a 16 character x 2 line LCD and keypad in an Arduino shield format for providing a user interface for a project.

This is a very popular LCD Keypad shield for Arduino or Freeduino board. It includes a 2×16 LCD display and 6 momentary push buttons. Pins 4, 5, 6, 7, 8, 9 and 10 are used to interface with the LCD.

Analog Pin 0 is used to read the push buttons. The LCD Keypad Shield LCD1602 supports contrast adjustment and backlit on/off functions. It also expands analog pins for easy analog sensor reading and display.

The LCD Keypad Shield LCD1602 is developed for Arduino compatible boards, to provide a user-friendly interface that allows users to go through the menu, make selections etc. It consists of a 1602 white character blue backlight LCD.

The keypad consists of 5 keys — select, up, right, down and left. To save the digital IO pins.

The LCD Keypad Shield LCD1602 interface uses only one ADC channel. The key value is read through a 5 stage voltage divider.

Using LCDs has always been one of the most popular ways to display information. LCDs are divided into two generic types: Characters and Graphics.

One of the most common, cheapest and simplest LCDs available is the character LCD. This LCD consists of several rows and columns.

Letters and numbers are written in places created by rows and columns. For example, LCD character 16*2 has 2 rows and 16 columns.

Features: –

• 16 character x 2 line Blue LCD
• 5 button keypad
• Fits Arduino Uno, Mega and similar Arduino boards with compatible I/O pin-out
• 5V operation

This shield provides an easy way to implement a user interface suitable for many projects such as having a user navigate through menus on the screen to select functions or setup a program such as for an automated lighting system.

LCD Keypad Shield LCD1602

This shield incorporates a 16 character x 2 line blue LCD display. It uses a 4-bit parallel bus to communicate with the uC. Good library support makes this easy to use as shown in the example program below.

The backlight has a multi-turn potentiometer for adjusting the contrast of the display for best viewing.

LCD Keypad Shield LCD1602 Keypad

The module includes a small keypad that has UP/DOWN/LEFT/RIGHT/SELECT buttons.  The last button is a remote RESET button.

The buttons (except for reset) all connect to a resistor voltage divider that come into the analog input A0.  The output of the voltage divider will vary depending on which button pushed, so reading the value on analog pin A0 allows you to tell which button pushed.  The example program below shows how this is done in the Read_Buttons() function.

Arduino to Shield Pin Connections

The shield occupies the following pins on the Arduino:

• D4 = LCD DB4
• D5 = LCD DB5
• D6 = LCD DB6
• D7 = LCD DB7
• D8 = RS
• D9 = LCD Enable
• D10 = Backlight Control
• A0 = Analog value of the button pushed

Many of the other pins not used by the LCD or buttons come out to break-out pads on the shield making them available.  Wires or headers can be soldered to these pads if desired.

The holes at the top of the module from left to right connect to the following pins on the Arduino which are not used by the LCD.
D13, D12, D11, D3, D2, D1, D0.

The holes along the bottom edge of the board connect to all the pins from RST on the left thru A5 on the right but skips pin A0 which is used by the buttons.

A red LED lights when power is applied.

Package: –

1 x LCD Keypad Shield LCD1602

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