Making my own custom voltage logger based on the ADS1256 - Prototype

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UPDATE:
Since this video, I created my own custom library for the ADS1256. Please visit my website for the library files and for a very detailed documentation:
curiousscientist.tech/ads1256...
In this video I show you the prototype of my ATmega32U4 and ADS1256-based 8 channel, 24-bit voltage logger circuit. After making so much experiments based on the ADS1256 AD converter I really wanted to make my own circuit based on this chip. Since I already made a fully working code for the AD converter, I thought it would be great to have the circuit to be made by me as well. Unfortunately, I did a few little mistakes on the PCB, so I have to make a second version, but the mistakes are not too large, so I could make this board to work properly with just a small hacking.
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For schematics and additional info, visit my website:
curiousscientist.tech/blog/cu...
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[@furqanahmed5452]

The work you do is important and so appreciated

[@CuriousScientist]

Thank you!

[@jabels4479]

Its awesome. I think everyone here has been beholden to comment #37 on some random forum 12 years ago whose attachments no longer work.

[@jabels4479]

Im working on some pcb antennas. Maybe ill try them out!

[@CuriousScientist]

Thanks! Let me know if you are interested, I also have assembled boards. Also, I am very close to finish my custom library and the corresponding documentation for the ADS1256. Stay tuned, hopefully you might find them useful.

[@Telectronics]

Hi what do you think can you attach a ph probe directly to it or is the input resistance still to low ?

[@CuriousScientist]

Hi! Great question! I would say no, not directly because as you said the input impedance of this ADC is just too low, even with its input buffer enabled. You would need, if I am not wrong, around a few gigaOhms, or terraOhms input impedance. It is relatively cheap to build such a buffer with an OP-amp and a few passives.

[@Telectronics]

Cool I found some TLC271 in my parts bin and looked at their datasheet I would try them as a buffer then in line with the ADC.

[@CuriousScientist]

I used TL072, it was also good.

[@TuanNguyen-be4wj]

Hello, Im working with EIT project (Electrical impedance tomography), I really love your project, I try your code ADS1256 to measure 10khz-100khz AC Voltage but it seem to be not working. Can U make a video about that issue ? thanks for your contributions to science.

[@CuriousScientist]

Hi! Sorry, but I am not making videos for requests for free. The problem is not the code, but this device is nowhere near to be able to measure 100 kHz...

[@TuanNguyen-be4wj]

@@CuriousScientist thank you

[@CarmeloFiorello]

Hello thanks for this amazing video, will you sell these?

[@CuriousScientist]

Thank you! Yes, I will soon receive the revised boards and I will start assembling and selling them, of course with software. I will definitely make a video about it!