Would i need a voltage divider even though the output of the pressure sensor is 0.5-4.5V to the arduino Nano
Thats a pretty cr*p regulator!
If you mean the output from the pressure sensor is in the range 0.5 to 4.5V then provided you use the "DEFAULT" reference you should be OK.
Its a bit rude to only show part of the schematic and prevents us form giving advice on the unseen bits - eg what is connected to A0?
Also you could rotate the image 90 degrees counter clockwise so I dont have to look at it sideways!
Yes, no, maybe.
It's actually 10% to 90% of VCC of the sensor, and yes, that's 0.5volt to 4.5volt if supply is 5.0volt.
Not that any of this matters practically.
Just connect the sensor to 5volt, ground and directly to an analogue input of the Nano.
(assuming a classic 16Mhz ATmega328 Nano v3).
Leo..
Thanks @idekman1813
Since the sensors are fed from +5V and GND on the nano the voltage to the analog inputs can never exceed the "DEFAULT" reference (unless there is a fault.)
Basically they are potentiometric, just like your R2, R3, R4.
I'm not happy about your D13, connecting a positive voltage rail to a digital input is a bad way to get a logic level input.
see here
If you MUST use a positive voltage input ...
???? Please explain how you would get a logic HIGH on D13?
What about D4?
I use that method all the time.
Thanks.. Tom.. 
Well, I'd use an internal pullup and a switch to ground.
Yes D4 also.
However it all gets a bit academic since
the three pots could also potentially connect Dx directly to 5V
and the 5V is coming FROM the Arduino so it cant be present if the power to the arduino is removed.
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I always avoid using pin13 as input on a classic Nano.
There is a LED directly attached to that pin,
and that LED could flash during bootup (could be set to output during that time).
D7 seems to be free.
Old story for the switches.
Use pinMode(pin, INPUT_PULLUP);
no resistors.
inverse logic.
Leo..
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How can i test if they function. Is there a simple code which i can use?
const byte buttonPin = 2; // button between pin2 and ground, no resistor
// LED pin (pin13) is normally HIGH (LED on), and LOW (LED off) when button is pressed
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
pinMode(buttonPin, INPUT_PULLUP); // internal pull up
}
void loop() {
digitalWrite(LED_BUILTIN, digitalRead(buttonPin)); // LED follows button
}
sorry i meant how can i test if the pressure sensors function through simple code.
So I have used the following code. I have used the schematic provided above to wire my pressure sensor.
this is the code i used:
/*
The XGZP6847 is an analog pressure sensor that can measure pressure in the range of -100 kPa to 100 kPa. You can use an Arduino to read the output voltage from the sensor and convert it to pressure. Here's a simple example:
In this example code, we connect the output of the XGZP6847 pressure sensor to an analog pin (A0) on the Arduino. The Vsupply, Voffset, and sensitivity variables store the sensor's parameters according to the datasheet.
The loop function reads the raw ADC value from the pressure sensor using analogRead and converts it to a voltage value. The pressure is then calculated based on the output voltage and the sensor's parameters. The pressure value in kPa is printed to the serial monitor.
Note: This example assumes you have already connected the XGZP6847 pressure sensor to your Arduino according to the manufacturer's recommendations. Be sure to consult the sensor's datasheet for proper wiring and usage instructions.
*/
const int pressurePin = A0; // Analog input pin connected to the pressure sensor output
// Pressure sensor parameters (refer to the sensor's datasheet)
const float Vsupply = 5.0; // Supply voltage to the sensor
const float Voffset = Vsupply / 2; // Offset voltage at 0 kPa
const float sensitivity = Vsupply / 2000; // 2.5 mV/kPa for the -100 kPa to 100 kPa range
void setup() {
Serial.begin(9600);
}
void loop() {
int rawValue = analogRead(pressurePin);
float voltage = (rawValue / 1023.0) * Vsupply;
// Calculate pressure based on the output voltage
float pressure = (voltage - Voffset) / sensitivity; // Pressure in kPa
Serial.print("Pressure: ");
Serial.print(pressure);
Serial.println(" kPa");
delay(1000);
}
But the output i am getting is weird. I dont understand what has gone wrong
this is the wiring instructions from the data sheet
Your voltage is in Volts but the sensitivity factor you are dividing by is in mV, so you are off by a factor of 1000.
Sorry didnt realise this as this isnt my code. So replace 2000 with just 2?
XGZP6847 is the base part number for a series of parts. What is the FULL number? What is the full scale pressure?
Hmm... sorry i did not realise this. I also cant seem to find the exact number, i shall contact the supplier and get this info ASAp
So your code and schematic are not developed by you, so you have no knowledge of how it all functions?
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom.. 
Just very basic knowledge, still in highschool doing this for a project
i still havent got the full number, but even then the wiring is same. I should be getting some output no? instead of '?'
I measured the output voltage with no applied pressure and it has an output of 4.10V. Seems odd