Recommendation on amplifier for pressure sensor?

ataveras64

Joined Jun 11, 2020
2
I have project that has to do with measuring tire pressure from a range of 0-60 PSI. The corresponding voltage range is from 0.486v to 1v. Looking for recommendations on amplifiers for a case like this, i will be feeding the output into an arduino nano to use for programming. I am new to amplifiers and electronics in general but I know the basics pretty well.

Right now I wish I was an E.E. instead of an M.E., but ill learn.

djsfantasi

Joined Apr 11, 2010
6,711
I have project that has to do with measuring tire pressure from a range of 0-60 PSI. The corresponding voltage range is from 0.486v to 1v. Looking for recommendations on amplifiers for a case like this, i will be feeding the output into an arduino nano to use for programming. I am new to amplifiers and electronics in general but I know the basics pretty well.

Right now I wish I was an E.E. instead of an M.E., but ill learn.
Why do you think you need an amplifier? The Arduino’s ADC will measure a voltage in increments of about 5mV. It will give you approximately 100 different values for the range you specify. Without any amplification.

drc_567

Joined Dec 29, 2008
869
... No expert, but as I recall, the Uno Arduino has a convenient means to set the internal voltage reference, so that you get a proportional reading of 1024 counts between 0 and 1 volt, rather than 0 to 5 volts.
... There is a book that seems to have reasonably clear explanations.:
John Boxall
Arduino Workshop: A Hands-On Introduction with 65 Projects

ataveras64

Joined Jun 11, 2020
2
I have actually read that book recently, and yes I didn't consider using the reference voltage feature. My plan before was to amplify the signal then filter it with using a high pass filter configuration. The reason why I was going that route was because the incoming signal from the sensor had a little more variation than I would like it to, after doing the required conversion within the programming my output in PSI has a variation of around 3-4 PSI while the pressure is steady.

Another issue I had was getting the correct slope increment of the sensor(mV/PSI), as the pressure increase the slope increases. For example, at 15 PSI the average slope is 8 but at about 45 PSI the slope is almost 11. The slope is suppose to be linear according to the datasheet but my reading don't confirm it.

I will try with the reference voltage on the arduino