MCP3464 Interfacing with ESP32 , Unable to relate the output voltage with input voltage

Using Arduino Programming Questions
1

Hi,
Module : ESP32
External ADC : MCP3464
COmmunication Protocol : SPI

I'm able to read and write the registers . Also getting the output value .
But I'm unable to relate the output digital value with analog input.
2. I tried to convert digital to analog using ADC formula using resolution of 2^16 ( 2^15 - 1).

Please suggest me if I'm missing something and also If I'm getting correct value or not

2

hi,

assuming you are reading back the ADC values correctly (we cannot see your code!) then did you try something like this then?

let ((2^15)-1) = Vcc (ESP32 supply)

then for an value adc = (adc * Vcc)/((2^15)-1)

hope that helps

3

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