How can I change the range of the sensor?

Projects Programming
1

When I run the code and view it on serial monitor...

Than I put pressure on the sensor the highest number i get is around 1.18 - 1.30..

How can I modify the code so it goes from 0 to 100 not 0 to 1.30..? HELP?!

// Flexiforce quick start example
// Reads A0 every 100ms and sends voltage value over serial

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

    void loop() 
{
  // Read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);
  
  // Print out the value you read:
  Serial.println(voltage);
  
  // Wait 100 milliseconds
  delay(100);
}
2

Simply multiply the voltage by 100 and divide by the maximum that the pressure sensor can give. You need to check the datasheet of the pressure sensor for the latter value.

3

sterretje:
Simply multiply the voltage by 100 and divide by the maximum that the pressure sensor can give. You need to check the datasheet of the pressure sensor for the latter value.

it says 'Reference Resistance R, is 1KQ to 100kQ

I am so confused..

IS THIS the part of the code I need to play around with???
float voltage = sensorValue * (5.0 / 1023.0);

4

So it does not output a voltage. I think that you must first start with a simple diagram (can be hand drawn) how you connected the sensor and post it here. If you provide a link to the datasheet, we can have a look at it as well.

// read voltage
float voltage = sensorValue * (5.0 / 1023.0);
// multiply by 100
voltage *= 100.0;
// divide by 1.30
voltage /= 1.30;

It should be something in the line of above; not sure of some values need a cast to float.