4 replies to this topic

[engvidal]

Hi

 

If the ADC resolution is 12 bits (from 0 to 4095) why I only obtain a 10 bit result (0 to 1023) ?

 

and more: Why the line in red (reference [color=#ff0000;]pot1[/color]) do not compile ?

 

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

[color=#ff0000;]AnalogInput pot1 = new  AnalogInput(Pins.GPIO_PIN_A1); // DO NOT COMPILE ! ![/color]
 

  SecretLabs.NETMF.Hardware.AnalogInput  pot =

  new SecretLabs.NETMF.Hardware.AnalogInput(Pins.GPIO_PIN_A1);
 

// using the full path compiles, even with the 'using SecretLabs.NETMF.Hardware'

 

 

Thank You.

 

 

[Fahdil]

Hi

 

If the ADC resolution is 12 bits (from 0 to 4095) why I only obtain a 10 bit result (0 to 1023) ?

 

and more: Why the line in red (reference [color=#ff0000;]pot1[/color]) do not compile ?

 

which literature that explain the analog input has 12bits? as i know Netduino has limit the analoginput to 10bits. see Hardware Specification.

[color=rgb(255,0,0);]AnalogInput[/color] pot1 = new AnalogInput(Pins.GPIO_PIN_A1); // DO NOT COMPILE ! !

 

it's bcoz you're using both:

using Microsoft.SPOT.Hardware

using SecretLabs.NETMF.Hardware;

 

the netduino with 4.2 framework has the ambiguity. try to delete "Microsoft.SPOT.Hardware".

[ShVerni]

As I understand it, the original Netduinos had 10 bit ADCs, while the Netduino 2 and the Netduino Plus 2 (and maybe the Netduino Go?) have a 12 bit ADC.

 

If you're worried about cross platform compatibility, you should use the Microsoft AnalogInput class, the Read method for which returns a number between 0 and 1 based on the reading, essentially a percentage of the maximum voltage.

 

To use the Microsoft class you need to use AnalogChannels not Pins:

AnalogInput pot1 = new  AnalogInput(AnalogChannels.ANALOG_PIN_A1);

Check out this thread for more details:

http://forums.netdui...etduino-plus-2/

 

Hope that helps!

[Chris Walker]

Fahdil -- as ShVerni said, switch over to the new Microsoft.SPOT.Hardware.AnalogInput class and you should be good to go. [Or you can pull in SecretLabs.NETMF.Hardware.AnalogInput if you want to use older code samples.] ShVerni -- thanks for responding to this. P.S. ADCs on Netduino Go vary by module (based on the best precision available on the particular module). Shield Base does have the same 12-bit ADCs as Netduino 2 and Netudino Plus 2.

[ShVerni]

ShVerni -- thanks for responding to thisG. P.S. ADCs on Netduino Go vary by module (based on the best precision available on the particular module). Shield Base does have the same 12-bit ADCs as Netduino 2 and Netudino Plus 2.

Glad to help, and thanks for the clarification!