Post Go back to editing

Example: Reading a Wheatstone Bridge Pressure Sensor with AD7124-8 (Wiring + Pressure Conversion

Thread Summary

The user seeks a ratiometric measurement setup using the AD7124-8 ADC and a Wheatstone bridge-based pressure sensor (MPM281PT). The final answer recommends the CN-0382 and CN-0102 reference designs for wiring diagrams, ADC configurations, and code examples. The AD7124 source code is available in the no-OS and Linux repositories. The solution covers differential input mode, gain, reference selection, filter settings, sample rate, and conversion of ADC output to pressure values.
AI Generated Content
Category: Hardware
Product Number: AD7124-8

Hi everyone,


I’m working on a ratiometric measurement setup using the AD7124-8 ADC and a Wheatstone bridge–based pressure sensor MPM281PT (such as piezoresistive pressure transducer).

I’m looking for an example or detailed explanation covering the following:

  • Wiring diagram for connecting the full-bridge pressure sensor to the AD7124-8 in a ratiometric configuration.

  • Recommended ADC configuration (differential input mode, gain, reference selection, filter settings, and sample rate).

  • How to convert the ADC output code to actual pressure values (in bar, kPa, or psi) — including the formula and any calibration steps.

  • Example code (C/C++ or Python) to read data from the AD7124-8 and compute the pressure based on the ratiometric principle.

My goal is to achieve a stable and precise pressure measurement by using the excitation voltage as the reference, thereby compensating for supply voltage variations.

If anyone has shared schematics, register configurations, or sample code for a similar ratiometric setup, I’d really appreciate your guidance! Pray

Thanks in advance!