32 Channel Strain Data Acquisition System

Hi guys,

Lovely community here. So i got into the bandwagon of the ESP32. I am planning to build an entire data acquisition built around the ESP32. Would really appreciate it much if i were to get help from all of you. It would be a learning experience for all of us. So basically here are my project details and list of components being used.

A 32 Channel Data acquisition system with 30 sensors measuring strain (momentarily using a metal gage strain sensor of 120Ohm being fed to a quarter bridge circuit) and 2 temperature sensors(PT100). I would like an acquisition speed of atleast 1000Samples/Sec per channel. So here is my idea as of now.

32 Sensors connected to its each wheatstones bridge. The amplifier is done using the XR18910/XR10910, which is a 16:1 bridge Mux interface with selectable gain. I have attached link https://www.exar.com/content/document.a ... rt=XR10910

The XR18911 can be controlled via I2C link. it does all the amplification necessary. I will need to use 2 XR10910 or 4 XR18911(8:1 sensor interface). And then finally controlled by our LEGENDARY ESP32 which converts the analog data to digital. and with the help of wifi to transmit it to a computer where it can be collected in an excel file along with time of capture.

Could you guys kindly help me out on how i am to proceed with programming of the ESP32. I would really prefer to use Arduino IDE guys, as that seems to simplify things. Also if there is any improvements that could be added to the circuit. Kindly let me know. Please let me know if you need more details(Picture attached). Thank you 

Before you even start programming, you need to do some critical timing analysis, sampling at 1K samples /sec is not trivial, and the data skew, if important, could be significant, since muxing is used. You need to look at the acquisition loop, use pseudo code to get an idea of how long the whole process takes, and where the bottle necks are, key areas being ADC, muxing, and WiFi timing.
You also need to do an analysis of the load cells, 1/4 bridges suffer from drift and high non linearity, what resolution are you needing, and you will end up needing at least 500mA for the bridge supplies.
Cheers,
Richard