Hello,
I've been trying to wrap my brain on how to convert an output signal from a Vacuum Sensor
The Sensor is an NXP MPXV6115V -115 to 0 kPa.
The issue is that I want to connect it to a TI LM3914 (which allows up to 5V signal), to create a 10 LED meter
When the Sensor is at 0kPa the output voltage is approximately 4.5V. On the LM3914 that would consider it a high signal and so all LEDs would turn on.
I would want to have 0kPa as 1 or no LEDs and -115kPa as all LED to turn on and have the LEDs turn on progressively as the pressure builds.
I have tried and attempted with op-amp to invert the voltage which I get a nice Opposite voltage (e.g 5V gives me -5V, 4V gives me -4V and so on) but its not the 5V-0V to 0V-5V I wanted.
I was thinking is there a way to add onto the inverted op-amp voltage? so that when I get my -5V a circuit can be implemented to add +5V onto the inverted signal to get the signal I wanted?
Or is there just a simpler way (without an MCU) or circuit to do it?
I hope to hear from you soon.
Best Mo
I've been trying to wrap my brain on how to convert an output signal from a Vacuum Sensor
The Sensor is an NXP MPXV6115V -115 to 0 kPa.
The issue is that I want to connect it to a TI LM3914 (which allows up to 5V signal), to create a 10 LED meter
When the Sensor is at 0kPa the output voltage is approximately 4.5V. On the LM3914 that would consider it a high signal and so all LEDs would turn on.
I would want to have 0kPa as 1 or no LEDs and -115kPa as all LED to turn on and have the LEDs turn on progressively as the pressure builds.
I have tried and attempted with op-amp to invert the voltage which I get a nice Opposite voltage (e.g 5V gives me -5V, 4V gives me -4V and so on) but its not the 5V-0V to 0V-5V I wanted.
I was thinking is there a way to add onto the inverted op-amp voltage? so that when I get my -5V a circuit can be implemented to add +5V onto the inverted signal to get the signal I wanted?
Or is there just a simpler way (without an MCU) or circuit to do it?
I hope to hear from you soon.
Best Mo