This is a very popular LCD Keypad shield for Arduino or Freeduino boards. It includes a 2x16 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 shield supports contrast adjustment and backlit on/off functions. It also expands analog pins for easy analog sensor reading and display.
The LCD Keypad shield 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 keypad interface uses only one ADC channel. The key value is read through a 5-stage voltage divider.
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