Stopwatch based on FSR

Projects General Guidance
1

So my problem is pretty straight forward. My project involves FSR sensors embedded into an insole of a shoe. If the user jumps I want it to start a timer to see how long the user stays in the air. Here is my code so far and all it does is print "Hang-time demo"

#include <StopWatch.h>
const int analogInPin = A0; //Analalog port FSR is connected to
int sensorValue;
StopWatch MySW;

void setup() {
  Serial.begin(9600);
  Serial.println("Hang-time demo");
}

void loop() {
sensorValue = analogRead(A0);

if(sensorValue = 0){
  
 Serial.println(MySW.isRunning());
  delay(100);

  MySW.start();
  Serial.println(MySW.isRunning());  
  Serial.println("START 1");
  Serial.println(MySW.elapsed());
  }
    
     if(sensorValue > 0){
     MySW.stop();
  Serial.println(MySW.isRunning());
  Serial.println("STOP");
  Serial.println(MySW.elapsed());
  }
}

Anyone have any ideas of why it isn't working? Any thoughts are welcome, and thanks in advance!

2 
if(sensorValue = 0){

Too few equals.

3 
if(sensorValue = 0){

Whoops !

4

Okay, I over looked that a bit. Thanks for that. Here is my updated code:

#include <StopWatch.h>
const int analogInPin = A0; //Analalog port FSR is connected to
int sensorValue;
StopWatch MySW(StopWatch::SECONDS);

void setup() {
  Serial.begin(9600);
  Serial.println("Dave is gay");
}

void loop() {
sensorValue = analogRead(A0);

if(sensorValue == 0){
Serial.println(MySW.value());
  MySW.start();
  delay(1000);
  }
    
     if(sensorValue > 0){ 
      MySW.stop();
      MySW.reset();
      }
      
}

It does exactly what I want it to for now, count seconds and display them every second and reset it when pressure is reapplied. Now, how can I output every 100 milliseconds, for example 1.00, 1.01, 1.02 ...

5

If only there was a function, let's call it millis(), that incremented a counter every millisecond then we could use the value of the counter to determine that a millisecond had passed.