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Arduino script for time measurement (to be used with Python and the Arduino class)
//Initialize global variables
int ledRed = 8; //Red LED pin
int ledGreen = 9; //Green LED pin
int sensorCurrent = 10; //Sensor pin
int sensorRed = 0; //Red laser light sensor
int sensorGreen = 0; //Green laser light sensor
int measurements = 0; //Number of measurements done
int numberOfMeasurements = 1; //Measurements to be done (must be the same as nSamples in the Python script)
float t1; //Initial time (time at the start of the measurement)
float t2; //End time (time at the end of the measurement)
float total; //t2-t1 Time interval (positive)
boolean green = false; //Check variable. If true the red sensor has been triggered, therefore the green can be triggered
boolean currentOn = false; //True: the current to the light sensors is on
//Setup function
void setup()
{
//Initialize serial port at 9600 baud
Serial.begin(9600);
//Initialize LED pins
pinMode(ledRed,OUTPUT);
pinMode(ledGreen,OUTPUT);
pinMode(sensorCurrent,OUTPUT);
}
//Main loop
void loop()
{
//Turn sensor current on
if(!currentOn)
{
digitalWrite(sensorCurrent,HIGH);
currentOn = true;
}
//Read sensor values
sensorRed = analogRead(A0);
sensorGreen = analogRead(A1);
//Debugging//
//Serial.println(sensorRed);
//If red sensor is triggered start counting time
//and light the red LED (pin 8)
if(sensorRed > 1000)
{
t1 = micros();
green = true;
digitalWrite(ledRed,HIGH);
}
//If green sensor is triggered stop counting and
//print out the time. Light the green LED (pin 9)
if((sensorGreen > 900) && (green))
{
t2 = micros();
total = (t2 - t1);
Serial.println(total);
digitalWrite(ledGreen,HIGH);
//Wait 1 sec
delay(1000);
//Turn LEDs off and increment the number of measurements done
digitalWrite(ledRed,LOW);
digitalWrite(ledGreen,LOW);
green = false;
measurements = measurements + 1;
//If the number of measurements done is equal to the number of the required, the current
//to the light sensors is cut off.
if(measurements >= numberOfMeasurements) //Only one measurement is done in this case,
{ //then the current to the sensors is cut off
digitalWrite(sensorCurrent,LOW);
}
}
}
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