diff --git a/doc/Arduino-Mega-LCD1602-keypad-shield-wiring.markdown b/doc/Arduino-Mega-LCD1602-keypad-shield-wiring.markdown
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+# Arduino Mega Arduino LCD1620 Keypad shield wiring
+
+## Introduction
+
+This shield consists of three logical parts:
+
+- 1602LCD with HD4780 Dot Matrix Liquid Crystal Display Controller/Driver.
+- 6 button keypad.
+- Analog pins, 5V and GND pass through.
+
+<div class=pagebreak></div>
+
+## Wiring illustration
+
+![Arduino Mega LCD1602 Keypad shield wiring LCD part.png](Arduino-Mega-LCD1602-keypad-shield-wiring.png)
+
+Author: [Lauri Võsandi](http://lauri.võsandi.com/arduino/lcd1602-key-shield.html#hd44780)
+
+<div class=pagebreak></div>
+
+## Wiring table
+
+| Signal | ATMega2560 port and pin | Arduino Mega 2560 pin | LCD 1602 Keypad shield | 1602 LCD pin | HD44780 pin |
+| --- | --- | --- | --- | --- | --- |
+| **LCD** | | | | |
+| Data bus DB4 | PORTG pin 5 | Digital pin 4 | 4 | 11 | DB4 |
+| Data bus DB5 | PORTE pin 3 | Digital pin 5 | 5 | 12 | DB5 |
+| Data bus DB6 | PORTH pin 3 | Digital pin 6 | 6 | 13 | DB6 |
+| Data bus DB7 | PORTH pin 4 | Digital pin 7 | 7 | 14 | DB7 |
+| Select register RS | PORTH pin 5 | Digital pin 8 | 8 | 4 | RS |
+| Start read/write E | PORTH pin 6 | Digital pin 9 | 9 | 6 | E |
+| Backlight control | PORTB pin 4 | Digital pin 10 | 10 | 16 | - |
+| Backlight 5V (via variable resistor ) | - |  - | - | 3 | - |
+| **Keypad** | | | | |
+| Buttons (select, up, right, down and left) | | Analog pin 0 | 0 | - |
+| Reset button | - | RESET | RESET | - |
+| **Pass through** | | | | |
+| Analog A1 .. A5 | | Analog pin 1 .. 5 | Analog pin 1 .. 5 | - |
+| **Common** | | | | |
+| 5V | - | 5V | VCC | 2 and 15 | Vcc |
+| Ground (GND) | GND | GND | pin 1 | GND | GND |
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diff --git a/doc/Arduino-Mega-USB-UART-wiring.markdown b/doc/Arduino-Mega-USB-UART-wiring.markdown
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@@ -12,6 +12,6 @@ This wiring schema uses only Tx from Arduino and is suitable to be used as stand
 
 | Signal | ATMega2560 port and pin | Arduino Mega 2560 pin | USB UART converter pin |
 | --- | --- | --- | --- |
-| Ground (GND) | - | GND | GND |
-| Transmit data  from Arduino (TxD) | PORTJ 1 (TXD3) | 14 (TX3) | TxD |
+| Ground (GND) | GND | GND | GND |
+| Transmit data  from Arduino (TxD) | PORTJ pin 1 (TXD3) | Digital pin 14 (TX3) | TxD |