2-Axis Joystick:

• The X-Axis potentiometer of the joystick is connected to A0. 
• The Y-Axis potentiometer is connected to A1.
• This button is connected to D8.

Buttons: There are a total of 6 buttons on the board (not including the one on the joystick) labeled A-F.

• Button A – Connects to D2
• Button B – Connects to D3
• Button C – Connects to D4
• Button D – Connects to D5
• Button E – Connects to D6
• Button F – Connects to D7

Bluetooth Connector: The RX/TX lines are brought out to a separate 4-pin female header along with 3.3V and Ground.  This can be used for connecting a 4-pin 3.3V Bluetooth device or a TTL serial device.

I2C Connector: The I2C SDA and SCL lines are brought out to a separate 4-pin male header along with 5V and Ground.  This is in addition to the normal A4/A5 location of these lines.  This allows for easy attachment of I2C devices.

nRF24L01 Connector: This connector allows a nRF24L01 RF transceiver module to be plugged in.

2 x 4 Female Header:

• GND  –  Ground.
• VCC  –   3.3V
• CE  –      Connects to D9
• CSN   –  Connects to D10
• SCK –     Connects to D13
• MOSI –  Connects to D11
• MISO –  Connects to D12
• IRQ –     No Connection

Nokia 5110 LCD Connector:

This female header connector is designed to mount the Nokia 5110 LCD that was originally designed for Nokia phones and provides a 48×84 pixel matrix.

This interface occupies the same D9-D13 pins as the nRF24L01, so you can’t use both at the same time.

Interface Connector:

This dual row yellow male header connector provides another point of access to all the buttons, joystick pots, 3.3V, 5V and Ground.  The pin-out of this connector is labeled on the board to the left of the connector.

Features :

1. NRF24L01 RF interface.
2. for Nokia 5110 LCD interface.
3. bluetooth interface I2C interface.
4. for one PS2 joystick.
5. 2-Axis joystick.
6. Bluetooth / Serial interface.
7. I2C interface.
8. nRF24L01 interface.
9. Nokia 5110 LCD interface.
10. Interface connector.
11. Power switch to switch between 3.3 and 5V.