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# Lesson 16 Joystick PS2Â¶

## IntroductionÂ¶

A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. Joysticks are often used to control video games and robots. A Joystick PS2 is used here.

## Schematic DiagramÂ¶

This module has two analog outputs (corresponding to Xï¼ŒY biaxial offsets) and one digital output representing whether it is pressed on Z axis. The module integrates power indicator and can display operation condition.

In this experiment, we use the Uno board to detect the moving direction of the Joystick knob and pressing of the button.

## Experimental ProceduresÂ¶

Step 1: Build the circuit.

Step 2: Open the code file.

Step 3: Select the Board and Port.

Step 4: Upload the sketch to the board.

Now, push the rocker and the coordinates of X and Y axes displayed on Serial Monitor will change accordingly; press the button, and the coordinate of Z=0 will also be displayed.

## Code AnalysisÂ¶

The code is use the serial monitor to print the value of the VRX,VRY and SW pins of the joystick ps2.

```void loop()
{
Serial.print("X: ");
Serial.print(analogRead(xPin), DEC);  // print the value of VRX in DEC
Serial.print("|Y: ");
Serial.print(analogRead(yPin), DEC);  // print the value of VRX in DEC
Serial.print("|Z: ");
Serial.println(digitalRead(swPin));   // print the value of SW
delay(50);
}
```