# Grove PS 2 Adapter

![](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/img/PS221_sensor.jpg)

The PS/2 Adapter enables you to connect a PS2 device to the Arduino/Seeeduino mainboards. With the help of PS2Keyboard/PS2MouseNlibrary, you can create the bridge between these PS2 device and Arduino/Seeeduino.

[![](https://github.com/SeeedDocument/Seeed-WiKi/raw/master/docs/images/300px-Get_One_Now_Banner-ragular.png)](https://www.seeedstudio.com/Grove-PS%262-Adapter-p-966.html)

## Features

* Standard Grove interface
* Standard PS/2 interface

## Specification

| Item               | Min                         | Typical | Max  | Unit |
| ------------------ | --------------------------- | ------- | ---- | ---- |
| Voltage            | 4.75                        | 5.0     | 5.25 | V    |
| Current            | 100                         | mA      |      |      |
| Communication Mode | PS/2 Communication Protocol | /       |      |      |
| Clock Frequency    | 10                          | 15      | 33   | KHZ  |

## Application Ideas

* PS/2 mouse and keyboard input

## Usage

The PS/2 connector is a 6-pin Mini-DIN connector used for connecting keyboard and mouse to a PC compatible computer system.The PS/2 designs on keyboard and mouse interfaces are electrically similar and employ the same communication protocol. Today, this connector has been replaced by USB, but as Arduino/Seeeduino, it is also a good choice to use the PS/2 connector as it is more convenient and cheaper when you need a mouse or keyboard.

A PS/2 connector has 6 pins as you can see from the following diagram. Pin 1 and pin 6 are not connected. Pin 3 is for ground, and pin 4 is for power. The other 2 pins are for clock and data.

![](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/img/MiniDIN-6_Connector.svg.png)

| Pin | Name  | Function        | Correspond to the Grove Interface |
| --- | ----- | --------------- | --------------------------------- |
| 1   | +DATA | Data            | DATA                              |
| 2   | NC    | Reserved        | -                                 |
| 3   | GND   | GND Line        | GND                               |
| 4   | Vcc   | +5DCV           | VCC                               |
| 5   | +CLK  | Clock frequency | CLK                               |
| 6   | NC    | Reserved        | -                                 |

1.Plug the PS/2 mouse or keyboard to the Grove-PS/2 Adapter, and then connect Grove to the D5/D6 of [Grove - Base Shield](http://www.seeedstudio.com/depot/grove-base-shield-p-754.html?cPath=132_134). You can change the digital port as you like. But, don't forget to change the port number in the definition of the demo code at the same time.

!!!Note Pin 5 is the mouse data pin, pin 6 is the clock pin.

2.Plug the Base Shield into Arduino/Seeeduino and connect Arduino/Seeeduino to PC via a USB cable.

![](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/img/PS2_sensorss.jpg)

3.Download [PS2 Adapter library](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/res/PS2_Adapter_Library.zip), Unzip and put them in the libraries file of Arduino IDE by the path: ..\arduino-1.0\libraries.

4.Restart the Arduino IDE, open one of the demo codes, for example ps2\_mouse directly by the path:File -> Example ->PS2\_Adapter->ps2\_kbd.

```
/*
 * an Arduino sketch to interface with a ps/2 keyboard.
 * Also uses serial protocol to talk back to the host
 * and report what it finds. Used the ps2 library.
 */

#include <ps2.h>

/*
 * Pin 5 is the ps2 data pin, pin 6 is the clock pin
 * Feel free to use whatever pins are convenient.
 */

PS2 kbd(6, 5);

void kbd_init()
{
    char ack;

    kbd.write(0xff);  // send reset code
    ack = kbd.read();  // byte, kbd does self test
    ack = kbd.read();  // another ack when self test is done
}

void setup()
{
    Serial.begin(9600);
    kbd_init();
}

/*
 * get a keycode from the kbd and report it back to the
 * host via the serial line.
 */
void loop()
{
    unsigned char code;

    for (;;) { /* ever */
    /* read a keycode */
        code = kbd.read();
    /* send the data back up */
        Serial.println(code, HEX);
        // delay(20);  /* twiddle */
    }
}
```

Please click [here](http://www.seeedstudio.com/wiki/Upload_Code) if you do not know how to upload. After uploading the firmware to the MCU,you can check the status via a Serial Monitor(9600 baudrate):

![](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/img/Result.jpg)

X ,Y output value changes correspondingly while the mouse move around.

## Resources

* [Grove - PS/2 Adapter Eagle File](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/res/Grove-PS2_Adapter_eagle_file.zip)
* [PS2 Adapter Library](https://github.com/SeeedDocument/Grove-PS_2_Adapter/raw/master/res/PS2_Adapter_Library.zip)


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