4 replies to this topic

[CoryP]

Hello all. I have a question about the dimmer project in chapter 6 of Getting Started with Netduino.

 

When I run my code it is deployed successfully yet when I turn the potentiometer there is no change in the intensity of the led. I've checked my code, set my deployment target correctly, selected the correct Target framework to no avail. Am I overlooking something? Any guidance would be greatly appreciated.

 

Hardware: Netduino Plus 

Framework: .Net Micro Framework 4.2

 

Code: 

 

using System;

using System.Threading;

using Microsoft.SPOT;

using Microsoft.SPOT.Hardware;

 

using SecretLabs.NETMF.Hardware;

using SecretLabs.NETMF.Hardware.Netduino; 

 

namespace Dimmer

{

    public class Program

    {

        public static void Main()

        {

SecretLabs.NETMF.Hardware.PWM led = SecretLabs.NETMF.Hardware.PWM(Pins.GPIO_PIN_D5);

SecretLabs.NETMF.Hardware.AnalogInput pot = new   SecretLabs.NETMF.Hardware.AnalogInput(Pins.GPIO_PIN_A0);

 

            pot.SetRange(0, 100);

            int potValue = 0;

 

            while (true)

            {

                potValue = pot.Read();

                led.SetDutyCycle((uint) potValue);

            }

 

        }

 

    }

}

 

[Chris Walker]

Hi CoryP, Can you add a quick line after "potValue = pot.Read();" and see what values you're getting? Either the potentiometer isn't wired properly, the LED isn't wired properly, or there's something odd going on that we need to dig into

Debug.Print("potValue: " + potValue.ToString());

Thanks for picking up my book! And welcome to the Netduino community, Chris

[CoryP]

Thanks for the response Chris!

I added the line to my code and I see the values changing in my output tab in Visual Studio. 

What's weird though is if I deploy the project from Chapter 5 where the potentiometer controls a blinking LED everything works fine and turning the knob changes the rate of blinking.

[CoryP]

I seriously overlooked the fact that the LED was not wired properly based on my code.  My code was referencing Pin D5 and I had the LED wired for D0. Thanks for the guidance. Much appreciated.

[Chris Walker]

No worries, Cory. This is one of the reasons why we love Visual Studio so much: it's easy to debug these things. P.S. I think that we've all wired things up to the wrong place at least once before. That can be part of the fun of the journey. Welcome to the Netduino community, Chris