2016-10-10 16:28:38 +03:00
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# Arduino Mega Arduino LCD1602 Keypad shield wiring
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2016-10-10 11:45:39 +03:00
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## Introduction
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This shield consists of three logical parts:
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- 1602LCD with HD4780 Dot Matrix Liquid Crystal Display Controller/Driver.
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- 6 button keypad.
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- Analog pins, 5V and GND pass through.
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<div class=pagebreak></div>
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## Wiring illustration
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Author: [Lauri Võsandi](http://lauri.võsandi.com/arduino/lcd1602-key-shield.html#hd44780)
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<div class=pagebreak></div>
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## Wiring table
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| Signal | ATMega2560 port and pin | Arduino Mega 2560 pin | LCD 1602 Keypad shield | 1602 LCD pin | HD44780 pin |
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| --- | --- | --- | --- | --- | --- |
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| **LCD** | | | | |
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| Data bus DB4 | PORTG pin 5 | Digital pin 4 | 4 | 11 | DB4 |
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| Data bus DB5 | PORTE pin 3 | Digital pin 5 | 5 | 12 | DB5 |
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| Data bus DB6 | PORTH pin 3 | Digital pin 6 | 6 | 13 | DB6 |
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| Data bus DB7 | PORTH pin 4 | Digital pin 7 | 7 | 14 | DB7 |
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| Select register RS | PORTH pin 5 | Digital pin 8 | 8 | 4 | RS |
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| Start read/write E | PORTH pin 6 | Digital pin 9 | 9 | 6 | E |
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| Backlight control | PORTB pin 4 | Digital pin 10 | 10 | 16 | - |
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| Backlight 5V (via variable resistor ) | - | - | - | 3 | - |
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| **Keypad** | | | | |
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| Buttons (select, up, right, down and left) | | Analog pin 0 | 0 | - |
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| Reset button | - | RESET | RESET | - |
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| **Pass through** | | | | |
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| Analog A1 .. A5 | | Analog pin 1 .. 5 | Analog pin 1 .. 5 | - |
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| **Common** | | | | |
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| 5V | - | 5V | VCC | 2 and 15 | Vcc |
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| Ground (GND) | GND | GND | pin 1 | GND | GND |
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