Hi all,
I am trying to measure the reaction time of moving a foot between two pressure plates. I have taken another code as a template from another user (reaction time with buttons), and modified to code to add two load cells which basically have analog outputs so I simply use a analog read function. In my code I have put a delay of 1 millisec to give a frequency of 1000Hz (assuming the other parts of the code dont take much time), however the if statement doesn't get activated when the statement is satisfied. This code works correctly when I put a delay of 100 millisec. Is there a way i can write my code to make it work at a delay of 1 millisec. I know the values are measured correctly because of the serial monitor response, however the if statement (if (potstate > LoadP)) still doesnt get activated.
My first code for a project apologies if it ain't very clear.
// set pin numbers:
const int LoadCell1 = 2; // the number of the Pedal load Cell
const int LoadCell2 = 4; // the number of the Floor Load Cell
const int buttonPin = 4; // the number of the pushbutton pin
const int ledPin = 2; // the number of the LED (stimulus LED)
const int ledPin1 = 7; // The number for the LoadCell2 indicator LED
//Define loads for reaction time
const int LoadF = 300; // floor Load Cell target
const int LoadP = 800; // Pedal Load Cell target
// Variables will change:
int ledState = LOW; // the current state of the LED
int potstate; // the current reading from LoadCell1
int buttonState; // the current reading from button
int lastButtonState = LOW; // the previous reading from the input button
int lastpot = 5; // removes any noise at lower end
int LC2Count = 0;
// the following variables are long's because the time, measured in microseconds,
// will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
long debounceDelay = 20000; // the debounce time in micro second
unsigned long randNumber; // Generated random number
unsigned long minRandomNumber = 2000; // minimum number used to specify the range of random number
unsigned long maxRandomNumber = 5000; // maximum number used to specify the range of random number
unsigned long time1,time2,time3,react;
int buttonPressed = LOW;
int printcount = 0;
int takeReading = LOW;
//following variable help in reading buttons pins
int startread;
int reading1;
int reading2;
int reading3;
int start;
void setup()
{
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);
pinMode(ledPin1, OUTPUT);
//enabling serial communication
Serial.begin(115200);
// set initial LED state
digitalWrite(ledPin, ledState);
digitalWrite(ledPin1, ledState);
// if analog input pin 0 is unconnected, random analog
// noise will cause the call to randomSeed() to generate
// different seed numbers each time the sketch runs.
// randomSeed() will then shuffle the random function.
randomSeed(analogRead(0));
}
void loop()
{
startread = analogRead(LoadCell2);
if (startread > LoadF)
{
digitalWrite(ledPin1, HIGH);
start = 1;
}
else
{
digitalWrite(ledPin1, LOW);
start = 0;
}
//Serial.println(start);
if( printcount == 0)
{
Serial.println("press button when you are ready");
printcount = 1;
takeReading = LOW; // not to read button number 1 and
}
if( (buttonPressed == HIGH)&& (start == 1)) // this part is the stimuli control
{
digitalWrite(ledPin, LOW);
randNumber = random(minRandomNumber,maxRandomNumber); //in our code we have kept them as 2000 to 5000
delay(randNumber);
digitalWrite(ledPin, HIGH);
time1 = micros();
buttonPressed = LOW;
}
reading2 = digitalRead(buttonPin); //read button
if(takeReading == HIGH)
{
reading1 = analogRead(LoadCell1);
reading3 = analogRead(LoadCell2);
time3 = micros();
if ((reading3 < LoadF) && (LC2Count == 0))
{ react = time3 - time1;
LC2Count = 1;
}
Serial.print((time3-time1)/1000); // change to micro please
Serial.print("\t"); //tab
Serial.print(reading1);
Serial.print("\t"); //tab
Serial.println(reading3);
delay(1);
}
// If the switch changed, due to noise or pressing:
if (reading1 < lastpot || reading2 != lastButtonState )
{
// reset the debouncing timer
lastDebounceTime = micros();
}
if ((micros() - lastDebounceTime) > debounceDelay)
{
// whatever the reading is at, it's been there for longer
// than the debounce delay, so take it as the actual current state:
// if the button state has changed:
if (reading1 > lastpot)
{
potstate = reading1;
// only toggle the LED if the new button state is HIGH
if (potstate > LoadP) //this if statement dont work at 1000HZ
{
Serial.print("Your reaction time is: ");
Serial.print(react/1000);
Serial.println("ms");
Serial.print("Your movement time is: ");
Serial.print(((lastDebounceTime - time1)-react)/1000);
Serial.println("ms");
Serial.print("Your total braking time is: ");
Serial.print((lastDebounceTime - time1)/1000);
Serial.println("ms");
Serial.println();
digitalWrite(ledPin, LOW);
printcount = 0;
LC2Count = 0;
}
}
if (reading2 != buttonState)
{
buttonState = reading2;
// only toggle the LED if the new button state is HIGH
if ((buttonState == HIGH)&& (start == 1)) //starts taking reading
{
Serial.println("READY TO GO");
buttonPressed = HIGH;
takeReading = HIGH;
}
}
}
// save the reading. Next time through the loop,
// it'll be the lastButtonState:
lastpot = reading1;
lastButtonState = reading2;
}
Thank you in advance,
Zee
