alternates to ADC from Pycom Board

[svonbentzel]

Hello Folks, I am searching for an alternativ ADC. The Pycom Board ADC is F++ck ;-)

Non linear Voltage.
Pending Voltage and so on.

I want to connect an analog Pressure Sensor to the board.
But I need another ADC.

Any Hints?

[Bryan Hom]

@timh Hi, any chance that you have some examples for this? I tried the class that you linked, but its also calls i2cdev which from my research is made for a rasp pi? Thanks

[svonbentzel]

@robert-hh many thanks ! awesome. I ordered one ADS1115. I will test It and send feedback ;-)

[timh]

Hi

We use the AI418S https://www.ereshop.com/shop/free/I2C-AI418S_SHEET.pdf
with this library https://github.com/vitiral/linsensors/blob/master/linsensors/ai418s.py

It the nice thing about it, is it supports 0-5 V, 0-10V, and 0-20ma and 4-20ma
We are either using 0-10V and 4-20ma

Up to 18bit accuracy.

It has proven to be extremely reliable and robust (against people doing silly things ;-)

When reading via the library you are getting values in the appropriate range rather than having to scale them to the measured input. Of course you do have to scale to the input to whatever you are actually measuring.

They also have Analog out, and binary in (we are using that, 12/24V switch state)

A bit more expensive and bigger than the other options.

T

[robert-hh]

@svonbentzel ADS1115 (16 bit, 4 channel single ended or 2 channels differential) or ADS1015 (12 bit, 4 channel single ended or 2 channels differential), ADS7818 (12 bit), MCP3201 (12 bit).

I have drivers here:
https://github.com/robert-hh/ads1x15
https://github.com/robert-hh/ADS7818
https://github.com/robert-hh/MCP3201