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 Arduino LCD Keypad Shield for arduino
Arduino LCD Keypad Shield for arduino
MPN :
SKU : LCDShield-C36
Stock : 19pcs
Price:PKR 450.00
this dfrobot lcd keypad shield male pin connector  for arduino comprises a 16x2 blue lcd display and 6 momentary push buttons, from left to right, select, left, up, down, right and reset. the shield can be directly plugged onto an arduino duemilanove board, making soldering or fly wiring for connection unnecessary. pins 5, 6, 7, 8 and 9 are used as the interface to the lcd. the shield operates at 5v.

main features include:
 a 16x2 blue lcd
 adjustable contrast
 laminated design and easy to expand
 using modified lcd4bit interface

modified lcd4bit interface:
in order to preserve the spi port for future use, the digital io pins db7 10 and pin11 and pin 12 used in the original lcd4bit library have been moved to db4 7 and pin 8 and pin 9 respectively.

keypad:
the keypad consists of 5 pushbuttons — select, left, up, down and right plus a reset button. to save the digital io pin resource, the keypad interface only uses one adc channel. the key value is read through a 5 stage resistor voltage divider. when a key is pressed, the adc reads the voltage value through the voltage divider  then the voltage value is compared to the voltage value threshold stored in an array to identify which key has been pressed.
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