AnalogInput

Has anyone recieved an error from trying an AnalogInput command in visual studio 2010 express?

Here is my code, its from an example from the book I purchased.

 

using System.Threading; using Microsoft.SPOT.Hardware; using SecretLabs.NETMF.Hardware.Netduino; namespace POT_LED {   public class Program   {       public static void Main()   {       OutputPort led = new OutputPort(Pins.GPIO_PIN_D0, false);   AnalogInput pot = new AnalogInput(Pins.GPIO_PIN_A0);   int potValue = 0;   while (true)   {   // read the value of the potentiometer   potValue = pot.Read();   // blink the led based on the potentiometer's value (0-1023ms)   led.Write(true);   Thread.Sleep(potValue);   led.Write(false);   Thread.Sleep(potValue);   }     }   } }  

thanks in advance for any help.

Hi!

 

I beleive that it should work - do you get an exception?

 

1. If so,

1a) what error message do you see?

 1b) what line causes it?

2. if not,

2a) what kind of error is it?

2b) have you measured actual voltage on A0 using a multimeter?

 2c) what value do you see?

i wonder whats the analoginput class your using is.

 

the microsoft one want AnalogChannels.yourpin and not Pins.yourpin.

secretlabs one, i _think_ (never used it) wants it the way you have it.

Error  1  The best overloaded method match for 'Microsoft.SPOT.Hardware.AnalogInput.AnalogInput(Microsoft.SPOT.Hardware.Cpu.AnalogChannel)' has some invalid arguments  C:Users*****documentsvisual studio 2010ProjectsPOT_LEDPOT_LEDProgram.cs  16  31  POT_LED Error  2  Argument 1: cannot convert from 'Microsoft.SPOT.Hardware.Cpu.Pin' to 'Microsoft.SPOT.Hardware.Cpu.AnalogChannel'  C:Users*****documentsvisual studio 2010ProjectsPOT_LEDPOT_LEDProgram.cs  16  47  POT_LED Error  3  'Microsoft.SPOT.Hardware.AnalogInput' does not contain a definition for 'SetRange' and no extension method 'SetRange' accepting a first argument of type 'Microsoft.SPOT.Hardware.AnalogInput' could be found (are you missing a using directive or an assembly reference?)  C:Users*****documentsvisual studio 2010ProjectsPOT_LEDPOT_LEDProgram.cs  17  17  POT_LED

 

Those are the error messages I recieve, I was using the example in the Getting Started with Netduino.  Are there any better books that you could recommend?  

Thank you for responding.

Could you try replacing this line

AnalogInput pot = new AnalogInput(Pins.GPIO_PIN_A0);

 

with thse two lines instead:

 

var pot = new ADC(Pins.GPIO_PIN_A0);pot.RangeSet(0, 1023);

Does that help?

Error  1  The type or namespace name 'ADC' could not be found (are you missing a using directive or an assembly reference?)  C:Users*****documentsvisual studio 2010ProjectsPOT_LEDPOT_LEDProgram.cs  16  27  POT_LED

 

That showed up when i input that code.

 

 

hmpf.. i thought what i said was clear..

 

use that:

 

AnalogInput pot = new AnalogInput(AnalogChannels.GPIO_PIN_A0);

Error  1  The type or namespace name 'ADC' could not be found (are you missing a using directive or an assembly reference?)  C:Users*****documentsvisual studio 2010ProjectsPOT_LEDPOT_LEDProgram.cs  16  27  POT_LED

 

That showed up when i input that code.

Weird, I was under the impression that the ADC class resides within the SecretLabs.NETMF.Hardware.Netduino namespace for which you have a using statement in your example code snippet. But realized now that it's actually part of Stefan's toolkit as it's in the Toolbox.NETMF.Hardware.Netduino namespace. Sorry about that.

 

I'm sure NooM's suggestion will work.

I had same problem. I found I had to make following changes and it worked.

 

AnalogInput pot = new AnalogInput(AnalogChannels.GPIO_PIN_A0);

 

changed to: AnalogInput pot = new AnalogInput(AnalogChannels.ANALOG_PIN_A1);

 

I figured it out by deleting end of code after AnalogChannels when I put the dot in, the menu gave me the selections.

hanzibal--both the legacy SecretLabs and new NETMF AnalogInput classes are both named "AnalogInput". Toon and Ghunter--if you add the "SecretLabs.NETMF.Hardware.AnalogInput.dll" assembly as a reference to your project, you can use the code samples in the book as-is. Just type "SecretLabs.NETMF.Hardware.AnalogInput" when you create your object instead of just "AnalogInput". Visual Studio needs the full namespace since there are two options Welcome to the Netduino community, Chris

I'm new using Netduino,

In the micro specifications the ADC range is 12 bits, but I'm not capable to read more than 10 bits using AnalogInput. 

Anyone can I to do to read the 12 bits?

 

Thanks!

Thanks Chris. That solved my problem. I'll have to learn to be carefull about other references that might be missing. I have worked a little with the arduino but the netduino looks exciting with what it can do.

 

Bryan

In the micro specifications the ADC range is 12 bits, but I'm not capable to read more than 10 bits using AnalogInput.

  Netduinos gen 1 have 10-bit ADC, the max raw value is 1023, Netduino/Plus 2 have 12-bit ADC, the max raw value is 4095. If you have Netduino/Plus 2 and you are using the sample code above that includes SetRange(0, 1023) call, you are reading 12-bit value, but scaling it to 1024 range. Delete that SetRange() call to get the full range...

 

Welcome to the community!

  Netduinos gen 1 have 10-bit ADC, the max raw value is 1023, Netduino/Plus 2 have 12-bit ADC, the max raw value is 4095. If you have Netduino/Plus 2 and you are using the sample code above that includes SetRange(0, 1023) call, you are reading 12-bit value, but scaling it to 1024 range. Delete that SetRange() call to get the full range...

 

Welcome to the community!

Thanks CW2

But I'm not using the SetRange, please can you send me a little example?

Thanks a lot!