5 replies to this topic

[corythompson]

Hi all.

 

I'm new to netduino's I have a Netduino Plus 2 and wanted to expand the I/O ports.

I have wired the mcp23017 up like the image and have this simple code to test it bu only the on board led flashes and not the one on pin 7 of the mcp23017. where am I going wrong?

 

Thanks.

 

 

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;
using Toolbox.NETMF.Hardware;

namespace NetduinoApplication6
{
  public class Program
  {
  public static void Main()
  {
  Mcp23017 Mux = new Mcp23017();
  OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);

  while (true)
  {
  Mux.Pins[7].Write(true);
  Thread.Sleep(250);
  Mux.Pins[7].Write(false);
  Thread.Sleep(250);
  led.Write(true);
  Thread.Sleep(250);
  led.Write(false);
  Thread.Sleep(250);
  }
  }
  }
}

[NooM]

where did you specify its address?

[NooM]

ah i looked closer at the source from toolbox.

http://netmftoolbox....ailable classes

thats how you hook it up, seems correct.

 

you than have to specify its pin as outputs with: PinMode([color=rgb(0,0,255);]int[/color] Pin, [color=rgb(0,0,255);]bool[/color] Output)

than you can use: SetPin([color=rgb(0,0,255);]int[/color] Pin, [color=rgb(0,0,255);]bool[/color] Value)

 

http://netmftoolbox....ew/23314#354279

[Paul Newton]

Hi Cory, Welcome to the forums! You said that you have a Netduino plus "v2". On the V2's the I2C pins have been moved, they are no longer A4 & A5. In your diagram you show the old v1 A4 & A5 in use. Hopefully that's the problem (because its a simple one!) Paul

[corythompson]

Hi Cory, Welcome to the forums! You said that you have a Netduino plus "v2". On the V2's the I2C pins have been moved, they are no longer A4 & A5. In your diagram you show the old v1 A4 & A5 in use. Hopefully that's the problem (because its a simple one!) Paul

Thanks Paul.

 

Got it working

[corythompson]

I'm looking for ways to connecet multiple mcp23017's but google isn't helping much today.

How would I specify the second 23017 in code? I have 2 wired up but obviously a command to 1 will send the command to both.

 

Thanks