Hello All,
This may be a poor question but is there any issue with the Arduino pro mini reading the value from a 12-bit ADC IC, for example a ADS7866 or a MAX11644?
The Arduino pro mini uses the ATMEGA328P MCU.
My thought is that the Arduino pro mini will "chop off" 2 bits or is this incorrect thinking?
Thank you,
Entechbob
No, all the conversion is done by an external ADC, you just get the finished result and process it as you need.
Just look towards the more popular ADCs for which there are libraries and examples.
Qwiic 12-Bit ADC Hookup Guide
Adafruit 4-Channel ADC Breakouts
ADS1115 analog-to-digital converter and Arduino
Both of those chips use a serial interface. The ADS7866 uses SPI (or a bit banged equivalent) and the MAX11544 uses I2C. That means that you will get the full resolution of the ADC.
Since the 328P is a 8 bit µP it is likely you will have to read two 8 bit ints (MSB, LSB) then add them together.
Note that the two chips you linked to are completely different.
The first one is ratiometric and the second one is absolute with 4.096volt Aref.
So what type of sensor are you going to use. Ratiometric or absolute.
Leo..
I see now, I will keep that in mind, and thank you for the links too!
Thank you for this, I'll keep an eye out for it during testing!
Thank you for your comment, I learned something new - I'm leaning towards ratiometric. But I'm glad I ordered both to test out. In your opinion, would there be any reason not to go that route? I'm using the adc for a pressure sensor that will be powered from a wall outlet.
What kind of pressure sensor (output).
4-20mA sensors must be used with an absolute sensor, but others could require a ratiometric A/D.
A/D values (pressure) is not stable if the wrong A/D is used.
Maybe an external A/D is overkill. The sensor could have a 1% accuracy, in which case the Arduino A/D is good enough. Always post all the details if you want proper help.
Leo..
This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.