1 reply to this topic

[Spammy786]

Hi Guys

 

I am trying to read the values from my potentiometer. I got it working but the output is not really what I was expecting.

 

Firstly I dont understand the concept of the channels. 

Like for example, you physically connect something to PIN 0, but instead of choosing PIN 0, you have to select Cpu.AnalogChannel.ANALOG_0.

Is there any user friendly documentation on this, but anyways back to my problem.

 

I was using some snippnets from 1 of the posts I found in the netduino forums, basically the guy was just reading values from the potentiometer. I would like to do the same. heres the potentiometer I have

http://netram.co.za/...entiometer.html

 

But this guy was setting a range in his example. (pot.setrange(0,100)) I dont have those options. and I just want round numbers and not decimals. I just want to read values from 0-100 also in my example. Heres my code. I does output the values but it starts like 1 2 3 then back to 1 2 3 and then if you turn it slightly, it jumps all the way to 202. 

 

Only options I have for the AnalogInput is the following and what do they mean ? I have no clue.

Offset

Pin

Presicion (read only)

Read

ReadRaw

Scale

 

 

It basically needs to be refine and optimized. Any ideas

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

namespace NetduinoPotTester
{
    public class Program
    {
        public static void Main()
        {
            AnalogInput pot = new AnalogInput(Cpu.AnalogChannel.ANALOG_0);
            while (true)
            {
                int potValue = 0;
                potValue = pot.ReadRaw();
                Debug.Print(potValue.ToString());
            }
        }

    }
}

Thanks guys.

[KiwiDev]

Hi

 

How about this, it returns a value between 0 & 100.

 

PrecisionInBits = -1  maximum 

Offset = 0 so values will start from 0.0

Scale = 100 so result will be between 0.0 & 100.0

 

If you wanted say -50 to + 50 

Offset = -50

Scale = 100 

 

using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

 

public class Program
{
   public static void Main()
   {
      AnalogInput rotaryAngleSensor = new AnalogInput(Cpu.AnalogChannel.ANALOG_0, 100, 0, -1);

      while (true)
      {

         Debug.Print("Angle " + rotaryAngleSensor.Read().ToString("F1"));

         Thread.Sleep(250);
      }
   }
}

 

Bryn

blog.devmobile.co.nz