I bought a TBPDPNS150PGUCV sensor so I can detect when pressure is rising or falling and react to it via an arduino program. This is for a buoyancy control system, so all I need is to track the changing pressure with reasonable accuracy.
It's unamplified, and the data sheet http://sensing.honeywell.com/basic-output-signal-adjustment-temp-comp-008245-2-en-final-22jan142.pdf shows an amplifier circuit. However, before I buy the specific parts listed, I want to do it myself, if I can, with op-amps I have.
My problem? I hook it up to 5-9V power on pins 1 & 3, but no matter how much PSI I put it under, I see NOTHING on my scope measuring pins 2 & 4, even set at 50mV scale. I hooked it up to an LM386 op-amp I use for ultrasonic transducers (capacitor for 200x amplification), and still nothing. If I put something else in its place, like an ultrasonic transducer, I see the expected signal and all works as I expect.
I'm not an electronics guy, so I have no idea how to troubleshoot something that provides no response. I assume it's something I'm doing wrong, but I have no idea what to change. Input power is good, output pins are dead.
I bought 2, and they both behave identically, so it's not likely a bad part. I also noticed that this data sheet (http://media.digikey.com/pdf/Data Sheets/Honeywell Sensing & Control PDFs/TBP_NBP_Install_Instr~.pdf) shows pin1 taking Vsupply, but the above one shows pin1 as ground and pin3 as "VsExcitation", which has left me thoroughly confused.
All I want is 0-V volts corresponding to the pressure. Is this possible to get with this sensor?
Thanks!
It's unamplified, and the data sheet http://sensing.honeywell.com/basic-output-signal-adjustment-temp-comp-008245-2-en-final-22jan142.pdf shows an amplifier circuit. However, before I buy the specific parts listed, I want to do it myself, if I can, with op-amps I have.
My problem? I hook it up to 5-9V power on pins 1 & 3, but no matter how much PSI I put it under, I see NOTHING on my scope measuring pins 2 & 4, even set at 50mV scale. I hooked it up to an LM386 op-amp I use for ultrasonic transducers (capacitor for 200x amplification), and still nothing. If I put something else in its place, like an ultrasonic transducer, I see the expected signal and all works as I expect.
I'm not an electronics guy, so I have no idea how to troubleshoot something that provides no response. I assume it's something I'm doing wrong, but I have no idea what to change. Input power is good, output pins are dead.
I bought 2, and they both behave identically, so it's not likely a bad part. I also noticed that this data sheet (http://media.digikey.com/pdf/Data Sheets/Honeywell Sensing & Control PDFs/TBP_NBP_Install_Instr~.pdf) shows pin1 taking Vsupply, but the above one shows pin1 as ground and pin3 as "VsExcitation", which has left me thoroughly confused.
All I want is 0-V volts corresponding to the pressure. Is this possible to get with this sensor?
Thanks!