ADS1X15 Continuous Mode AND differential (0_1) & (2_3)

[NovaJeff]

Hi Rob, thanks for your libraries, I've been using many of them for years.

Is there a way to get both differential values (0_1 AND 2_3) on continuous mode?

I've been able to get.Value() on either, depending on the trigger read in setup(), but for the life of me I can't find a way to do it on both channels simultaneously...

Is there something obvious I'm missing?

Thank you Rob.

[RobTillaart]

It is rather late now (here) and I need to do some reading about the details to see if it is possible. can take a few days.

[RobTillaart]

A quick look did not reveal a solution, could code below be an option for you?

uint8_t pair = 01;

void setup()
{
  // setup stuff here incl. continuous mode gain etc.
  pair = 01;
  ADS.requestADC_Differential_0_1();
}

void loop()
{
  if (ADS.isReady())
  {
    if (pair == 01)
    {
      val_01 = ADS.getValue();
      pair = 23;
      ADS.requestADC_Differential_2_3();
    }
    else if (pair == 23)
    {
      val_23 = ADS.getValue();
      pair = 01;
      ADS.requestADC_Differential_0_1();
    }
  }
  // do other things here
}

code is a not working snippet, just to get the idea

[RobTillaart]

A second option is to read the 4 channels in continuous mode - see examples - and do the math yourself.

[RobTillaart]

@NovaJeff
FYI, I created a develop branch as I saw I need to fix the build-CI and some small readme updates.
Also added an example for continuous -differential reading. Could you test that for me?
It is not a PR yet

See - https://github.com/RobTillaart/ADS1X15/tree/develop

[NovaJeff]

Hello Rob, that was quick!
Unfortunately, for a reason I don't get yet, the handle_conversion() function never returns true.
To make sure I used a Serial.print debug line right after if (ADS.isReady()) and the line never printed.
I also tried if (!ADS.isBusy) with same outcome, as I expected...
Strange because I really think this approach is clever.
Tried this thru both your develop branch and the code snippet.

[NovaJeff]

Rob I just tried with ADS.setMode(1) in setup() and now handle_conversion() returns true.

[RobTillaart]

Thanks for testing and fixing.
Although it is not continuous mode, does this method solve your project need?

(I will change the example name and code so it is a working one - ADS_async_differential.ino

[RobTillaart]

Example adjusted and renamed.

[NovaJeff]

It works great for my project since it's non-blocking and more than fast enough. I really appreciate your swift replies and solutions.

[RobTillaart]

Thanx, good to hear it solves the issue. I will investigate if I can get continuous differential working, if so I'll let you know.

Until that investigation is done I keep this issue open as a reminder for me.

[RobTillaart]

insight.
In continuous mode the flag that indicates that the ADC is NOT_BUSY is always false.
This results in the isBusy() is always true and isReady() always false.

So to get a real continuous mode version I need to add the RDY (interrupt) pin. (so far theory / hypothesis :)

[RobTillaart]

• Found the hardware needed to setup a test.
• rewrite code for continuous differential with RDY / interrupt
• test
• release

[NovaJeff]

"In continuous mode the flag that indicates that the ADC is NOT_BUSY is always false."

This explains that then... I'm sure the workaround with RDY / interrupt will be a success.

Thx Rob!

[RobTillaart]

Works!
Example code is in the develop branch, and I'll review changes tomorrow to see if it still makes sense :)

Anyway it will be a PR for release 0.3.2

[NovaJeff]

Awesome Rob! Thanks for your time on all these nice libraries.

[RobTillaart]

0.3.2 released.