I build a pressure sensor breadboard according to the schematic. It works, but has quite low sensitivity - it shows some pressure only after big pressure is applied.

Is there a way to increase sensitivity by replacing some components with different values, without redesigning the PCB?

enter image description here

  • \$\begingroup\$ " it shows some pressure" What is the result, how are you measuring it? Please specify some quantitative data like volts or milli-volts. \$\endgroup\$
    – Oldfart
    Commented Jul 17, 2019 at 12:13
  • \$\begingroup\$ There is 0.08V on output when no pressure is applied, so my arduino analog pin reads 0. When I apply much pressure, it reads 1 and there are over 0.1 v. I would like to see readings starting from little pressure apply \$\endgroup\$ Commented Jul 17, 2019 at 13:10
  • \$\begingroup\$ You'll need to provide the datasheet for the sensor - to check its output impedance relative to the circuit, and its common mode output voltage. \$\endgroup\$
    – scorpdaddy
    Commented Jul 17, 2019 at 13:28
  • \$\begingroup\$ The sensor is MPS20N0040D. Input impedance of 4 - 6 KΩ, The output impedance of 4 - 6 KΩ, Full-scale output voltage 50 - 100 mV, Bridge Resistance to 4 - 6 KΩ, \$\endgroup\$ Commented Jul 17, 2019 at 13:40

1 Answer 1


Without bothering about any of the other questions, if the zero-pressure output of your sensor is zero, just increase R8 by whatever factor you want. If the zero-pressure output is not zero, if you make R8 too big you will saturate.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.