Hello,

I have an I/O expansion that I can't seem to get working as expected. The chip is the 328P, which, I believe, indicates this is a v1.0 module, correct?

When I load up the I/O expansion example code and hook up a float switch to one of the inputs, I don't seem to see any change to the status of the input represented on the display. They all continue to show green. I have also tried multiple float switches, so I don't believe they are the issue.

If I disconnect the module, all of the inputs turn red, so I assume it's recognizing the module itself.

I am happy to debug further if someone is able to provide some next steps.

Thanks,
-Steve

Are you closing the i/o channel to ground?

I have one side of the switch in I/O port 0 and the the other side connected to ground, so yes, it should close to ground. I have also tried just jumping between the I/O port and ground, and I still see no indication of it working.

With the I/O expansion connected and no switches attached, should all the inputs on the display show green in the example code? I would think they'd turn green only when a switch is activated.

Thanks,
-Steve

Anyone have any thoughts?

I picked this expansion module up from another reefer, but it's the old style (v1.0) and has no exterior labels.

Looking at the "documentation" for the I/O expansion on the website, it shows that it now has a DC connector input. However, this older style module only has a USB connector.

Opening it up, I see that it has the 328P chip, which I assumed meant that it's an I/O expansion. And the inputs in the example code turn green when I plug the module in, reinforcing this.

Is there any chance that this is a dimming expansion and not an I/O expansion? They look very similar from the outside.

Is anyone able to help out here? What additional debugging can I do? Can anyone point me to another thread, for example? I really need this module working in order to move my project forward. Thanks.

Can you send me a photo of the board?

Exterior:



Board:

Looks like it is configured to be I/O.
Not sure what is going on.

Any further way to debug, other than hooking it up to the controller?

If you want, you can debug just the module using Arduino, since this old module has a built-in mcu in it.
The original firmware is:

Code: Select all

#include <Wire.h>
#include <avr/wdt.h>

byte IOports[] ={
  3,5,6,9,10,11};

byte IOOut=0;
void setup()
{
  wdt_enable(WDTO_1S);
  Wire.onReceive(NULL);
  Wire.onRequest(requestEvent);
  Wire.begin(9);
  for (int a=0;a<6;a++)
  {
    pinMode(IOports[a],INPUT);
    digitalWrite(IOports[a],HIGH); //pull up resistor
  }
}

void loop()
{
  wdt_reset();
}

void requestEvent() {
  IOOut=0;
  for (int a=0;a<6;a++)
  {
    IOOut+=digitalRead(IOports[a])<<a; //pull up resistor
  }
  Wire.write(IOOut);
}