Honeywell Gauge Pressure sensor

Using Arduino Sensors
1

Hi,

Im trying to wire up and code a Honeywell gauge pressure sensor to an uno as part of my final year collage project. Does anybody have any experience with using such a pressure sensor? I have attached an image of the sensor and datasheet. Any replies would be greatly appreciated :slight_smile:

0900766b800320d8.pdf (260 KB)

2

PC90:
Hi,

Im trying to wire up and code a Honeywell gauge pressure sensor to an uno as part of my final year collage project. Does anybody have any experience with using such a pressure sensor? I have attached an image of the sensor and datasheet. Any replies would be greatly appreciated :slight_smile:

Looks pretty simple to use with an arduino. Just wire the devices ground to arduino ground pin, device +5vdc pin to arduino 5v pin, and devices signal output to a arduino analog input pin. Then you can use analogRead() commands to convert the reading to a digital value you can use in your sketch.

Lefty

3

Hi Lefty Thanks for the quick reply,

Im using the arduino for just a small aspect of my project so I would only be a novice when it comes to programming so please bear with me.
Ive used the following code but seem to be getting very fluctuating readings:

int analogPin = 2; // connected to analog pin 2
// outside leads to ground and +5V

int samples[8];
int i;
int pressure=analogRead(analogPin);

void setup()
{
Serial.begin(9600); // setup serial
}

void loop()
{
for (i=0;i<=7;i++){ // gets 8 samples of pressure
pressure = analogRead(analogPin); // read the input pin

long pressure = 950 + pressure / 8.5; //convert it to milli bars
Serial.print("\t pressure = ");
Serial.print(pressure); // print the pressure
Serial.println(" mb");

delay(5000); // wait 5 second before next sample

}

An example of my reading would be it would start at a value of say 750mb, then go 0mb..0mb then when I apply pressure using a syringe it would jump up to 1bar,But then go 0mb..0mb then 1bar etc.

4

I'll let more knowlegable software types comment on your sketch. However it doesn't seem correct to have two variables used both named pressure, one a int and global in scope and the other defined as a automatic variable inside loop() as a long variable and then both used in the same expression:

long pressure = 950 + pressure / 8.5; //convert it to milli bars

I'm suprized that doesn't generate some kind of compiler error, but again I'd rather a software guru type comment on that.

Lefty

5

Hello

Im a bit of a noob myself but..

"int analogPin = 2; // connected to analog pin 2"

On the Uno I thought Analog Pin 2 was represented by A2 in the compiler, the digital pins are 0-13, The Analogs being A0, A1, A2, etc

6

there are several pressure range listed in the datasheet, check the right values for Null and Sensitivity on page 32

sample code, not tested

#define ADC_HONEYWELL 2 // Arduino analog pin

const float Null = 0.50; // Null VDC; datasheet Page 32
const float Sensitivity = 266.6;  // Sensitivity mV/psi; datasheet Page 32

void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.print("P: ");
  Serial.print(getPressure());
  Serial.println("mbar g");
  delay(5000);
}

float getPressure(void) {
  float pressurePSI,pressureMBAR,pressureVDC;
  int pressure;
  
  pressure = analogRead(ADC_HONEYWELL);
  pressureVDC = (float)pressure * 0.0048828125; // (5/1024 = 0.0048828125)
  pressureVDC = pressureVDC - Null;
  pressurePSI = pressureVDC / Sensitivity * 1000; 
  pressureMBAR = pressurePSI * 68.948;
  
  return pressureMBAR;
}
7

Thank you so much for the help! Got it to work perfectly

8

Hi can you reattach
I have SB69-100V
0...100 psig
0.5....4.5 V out
Can i connect directly to arduino without resistor

9

Arizanov:
Hi can you reattach
I have SB69-100V
0...100 psig
0.5....4.5 V out
Can i connect directly to arduino without resistor

Given that minimum information, yes it can be wired to an arduino analog input pin. A datasheet listing would be nice to confirm.

Lefty

10

http://www.fullgauge.com/PDF/PCT-400.pdf
This is a controller + pressure transducer
for him don`t have datasheet
But have SCHEMATIC FOR TRANSDUCER
Brown: 5Vdc
Green: Ground
White: Output

11

Arizanov:
http://www.fullgauge.com/PDF/PCT-400.pdf
This is a controller + pressure transducer
for him don`t have datasheet
But have SCHEMATIC FOR TRANSDUCER
Brown: 5Vdc
Green: Ground
White: Output

Again, given what you have shown it should be OK. I would suggest you first power up the sensor independently and apply pressure tests to the sensor while measuring the output signal with a digital multimeter. If you see no signal higher then +5vdc then you should be good to go.

Lefty