Overview

This is a simplified example which is meant to help those working with Push Buttons and Netduino. In our original Push Button Example we demonstrated how to work with a push button at a low level. However, this example simplifies that code by creating a wrapper.

Code Sample

The following code is a wrapper / class to be used with push buttons. It has some easy methods and properties that are common to push buttons with netduino.

using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;

namespace NetduinoPlusApplication1
{
    public delegate void NoParamEventHandler();
    public class Button
    {
        private InterruptPort port;
        private Cpu.Pin pin;

        public event NoParamEventHandler Pressed;
        public event NoParamEventHandler Released;

        public Button(Cpu.Pin pin)
        {
            this.pin = pin;
            this.port = new InterruptPort(pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth);
            this.port.OnInterrupt += new NativeEventHandler(port_OnInterrupt);
        }

        public bool IsPressed
        {
            get
            {
                return !port.Read();
            }
        }

        void port_OnInterrupt(uint data1, uint data2, DateTime time)
        {
            if (data2 == 0)
            {
                OnPressed();
            }
            else
            {
                OnReleased();
            }
        }

        private void OnReleased()
        {
            if (Released != null)
            {
                Released();
            }
        }

        private void OnPressed()
        {
            if (Pressed != null)
            {
                Pressed();
            }
        }
    }
}

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