GamepadTester.cs

using UnityEngine;
using UnityEngine.UI;

public class GamepadTester : MonoBehaviour
{
    public int m_NumSticks;
    public Text m_Joysticks;
    public Text[] m_InputText;
    public Text[] m_ButtonText;

    private void Start()
    {
        int i = 0;
        string sticks = "Joysticks\n";
        foreach (string joyName in Input.GetJoystickNames())
        {
            sticks += i.ToString() + ":" + joyName + "\n";
            i++;
        }

        m_Joysticks.text = sticks;
        m_NumSticks = i;
    }

    private void Update()
    {

        for (int i = 1; i <= m_NumSticks; i++)
        {
            string inputs = "Joystick " + i + "\n";
            string stick = "Joy " + i + " Axis ";
            for (int a = 1; a <= 10; a++)
            {
                inputs += "Axis " + a + ":" + Input.GetAxis(stick + a).ToString("0.00") + "\n";
            }

            m_InputText[i - 1].text = inputs;
        }

        string buttons = "Buttons 3\n";
        for (int b = 0; b <= 10; b++)
        {
            buttons += "Btn " + b + ":" + Input.GetButton("Joy 3 Button " + b) + "\n";
        }

        m_ButtonText[2].text = buttons;
    }
}