New clone on the block

While browsing for low cost EVBs, I noticed that some of the ADS1115 (4-channel 16-bit delta-sigma i2c adc) are being fitted with an IC marked ADX111A.

Which turns out to be at least on paper nearly identically to the ADS1115.

https://datasheet.lcsc.com/lcsc/2302211830_analogysemi-ADX111AQFN10_C5359372.pdf

TI ADS111x

https://www.ti.com/lit/ds/symlink/ads1114.pdf

I'm not against competition. But the dark/dangerous side is when someone laser marks the chip as being TI's part, and sells it as a genuine TI part, when it most certainly isn't.

Glass half-full, glass half-empty....

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scottiebabe over 2 years ago

I have no clue how to use Industrial IO (https://www.kernel.org/doc/html/v4.12/driver-api/iio/index.html) but it appears to work, if that's you're thing.

I followed this guide: https://wiki.seeedstudio.com/4-Channel_16-Bit_ADC_for_Raspberry_Pi-ADS1115/

I followed this guide for a bit, but then it quickly went beyond me https://elinux.org/images/b/ba/ELC_2017_-_Industrial_IO_and_You-_Nonsense_Hacks%21.pdf

This as far as I got:

But I can read data out of the sysfs interface:

I don't know why I would use a low-speed ADC this way, but I guess I could if I wanted to...

Update: I needed to load the hr timer module:

Now following this guide as appropriate to the ads1115 works for 1 channel:
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scottiebabe over 2 years ago in reply to scottiebabe

This works too:

#! /usr/bin/python

import time, iio

ctx = iio.LocalContext()
ctrl = ctx.find_device('ads1015')

voltages = ['voltage0', 'voltage1', 'voltage2', 'voltage3']
for id in voltages:
    chan = ctrl.find_channel(id)
    print("{0}: {1}".format( chan.id, chan.attrs['raw'].value) )

Credit: https://stackoverflow.com/questions/48565894/using-the-iio-python-package

Maybe iio is the way to go...

scottiebabe over 2 years ago in reply to scottiebabe

What a rabbit hole...

https://github.com/analogdevicesinc/iio-oscilloscope

https://wiki.analog.com/resources/tools-software/linux-software/iio_oscilloscope
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scottiebabe over 2 years ago in reply to scottiebabe

Hold onto your hats boys and girls, this ADC is flying at a whopping 8 Sa/s...

Applying a 1 Cycle/s test tone.

Thanks ADI, neat demonstration and evaluation tool.
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scottiebabe over 2 years ago in reply to scottiebabe

Hold onto your hats boys and girls, this ADC is flying at a whopping 8 Sa/s...

Applying a 1 Cycle/s test tone.

Thanks ADI, neat demonstration and evaluation tool.
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