Good day everyone
I am working with a differential pressure sensor (all the details of the sensor are below). I am confused about how to wire them with Arduino UNO and get the positive or negative reading in psi. Can you please help me wire this and code for Arduino?
Thank you so much in advanced
Sensor: https://uk.rs-online.com/web/p/pressure-sensors/0286686
sps-siot-26pc-series-miniature-low-pressure-sensors-datasheet-32307741-a-en-ciid-155865.pdf (2.8 MB)
0900766b8146d53f.pdf (183.8 KB)
You will need an appropriate Wheatstone bridge amplifier for that sensor. Something like the INA125 will work, or you could try a differential amplifier module like the ADS1115.
For those options you will also need a stable, calibrated sensor power supply.
Since your transducer is a differential, measuring +/- pressure, the INA125 is a good recommendation as it has an IAref input to bias the output up into the range that the ADC on your can measure. It also has precise Vref outputs that you can probably use for bridge excitation.
If some sort of “balance” or atmospheric pressure cancellation was wanted you could drive the IAref input to the instrumentation amplifier with a DAC and take care of that programmatically.
A HX711 module has everything you need built-in.
Excitation voltage regulator, instrumentation amp and 24-bit A/D.
Leo..
Depending on transducer range, one might have to adjust the excitation voltage to accommodate one of the programmable gains of that device. 32, 64, and 128 are available.